score: PR2152: Use allocator mutex for objects

Use allocator mutex for objects allocate/free.  This prevents that the
thread dispatch latency depends on the workspace/heap fragmentation.

63 files changed, 419 insertions, 317 deletions

diff --git a/cpukit/libcsupport/src/resource_snapshot.c b/cpukit/libcsupport/src/resource_snapshot.c
index 8c66f0f7c2..6f5038de31 100644
--- a/cpukit/libcsupport/src/resource_snapshot.c
+++ b/cpukit/libcsupport/src/resource_snapshot.c
@@ -98,38 +98,28 @@ static int open_files(void)
   return (int) rtems_libio_number_iops - free_count;
 }
 
-static void free_all_delayed_blocks(void)
-{
-  #ifdef HEAP_PROTECTION
-    _RTEMS_Lock_allocator();
-    _Thread_Disable_dispatch();
-    _Heap_Protection_free_all_delayed_blocks( RTEMS_Malloc_Heap );
-    _Heap_Protection_free_all_delayed_blocks( &_Workspace_Area );
-    _Thread_Enable_dispatch();
-    _RTEMS_Unlock_allocator();
-  #endif
-}
-
 void rtems_resource_snapshot_take(rtems_resource_snapshot *snapshot)
 {
   uint32_t *active = &snapshot->rtems_api.active_barriers;
   size_t i;
 
-  free_all_delayed_blocks();
+  _RTEMS_Lock_allocator();
 
   _Thread_Kill_zombies();
 
-  _Protected_heap_Get_information(RTEMS_Malloc_Heap, &snapshot->heap_info);
-
-  _Thread_Disable_dispatch();
+  #ifdef HEAP_PROTECTION
+    _Heap_Protection_free_all_delayed_blocks(RTEMS_Malloc_Heap);
+    _Heap_Protection_free_all_delayed_blocks(&_Workspace_Area);
+  #endif
 
+  _Heap_Get_information(RTEMS_Malloc_Heap, &snapshot->heap_info);
   _Heap_Get_information(&_Workspace_Area, &snapshot->workspace_info);
 
   for (i = 0; i < RTEMS_ARRAY_SIZE(objects_info_table); ++i) {
     active [i] = _Objects_Active_count(objects_info_table[i]);
   }
 
-  _Thread_Enable_dispatch();
+  _RTEMS_Unlock_allocator();
 
   #ifndef RTEMS_POSIX_API
     memset(&snapshot->posix_api, 0, sizeof(snapshot->posix_api));
diff --git a/cpukit/posix/include/rtems/posix/pthreadimpl.h b/cpukit/posix/include/rtems/posix/pthreadimpl.h
index 02d8bca0f5..d4a04e1281 100644
--- a/cpukit/posix/include/rtems/posix/pthreadimpl.h
+++ b/cpukit/posix/include/rtems/posix/pthreadimpl.h
@@ -68,16 +68,6 @@ extern void (*_POSIX_Threads_Initialize_user_threads_p)(void);
 void _POSIX_Threads_Manager_initialization(void);
 
 /**
- * @brief Allocate POSIX thread control block.
- *
- * This function allocates a pthread control block from
- * the inactive chain of free pthread control blocks.
- *
- * @return This method returns a newly allocated thread.
- */
-RTEMS_INLINE_ROUTINE Thread_Control *_POSIX_Threads_Allocate( void );
-
-/**
  * @brief Copy POSIX Thread attribute structure.
  *
  * This routine copies the attr2 thread attribute structure
@@ -211,15 +201,14 @@ int rtems_pthread_attribute_compare(
   const pthread_attr_t *attr2
 );
 
-/*
- *  _POSIX_Threads_Allocate
- */
-
-RTEMS_INLINE_ROUTINE Thread_Control *_POSIX_Threads_Allocate( void )
+RTEMS_INLINE_ROUTINE Thread_Control *_POSIX_Threads_Allocate(void)
 {
+  _Objects_Allocator_lock();
+
   _Thread_Kill_zombies();
 
-  return (Thread_Control *) _Objects_Allocate( &_POSIX_Threads_Information );
+  return (Thread_Control *)
+    _Objects_Allocate_unprotected( &_POSIX_Threads_Information );
 }
 
 /*
diff --git a/cpukit/posix/include/rtems/posix/semaphoreimpl.h b/cpukit/posix/include/rtems/posix/semaphoreimpl.h
index 7754ee9ad7..df5e5238de 100644
--- a/cpukit/posix/include/rtems/posix/semaphoreimpl.h
+++ b/cpukit/posix/include/rtems/posix/semaphoreimpl.h
@@ -48,20 +48,13 @@ extern const int
  */
 void _POSIX_Semaphore_Manager_initialization(void);
 
-/**
- *  @brief POSIX Semaphore Allocate
- *
- *  This function allocates a semaphore control block from
- *  the inactive chain of free semaphore control blocks.
- */
-
-RTEMS_INLINE_ROUTINE POSIX_Semaphore_Control *_POSIX_Semaphore_Allocate( void )
+RTEMS_INLINE_ROUTINE POSIX_Semaphore_Control *
+  _POSIX_Semaphore_Allocate_unprotected( void )
 {
   return (POSIX_Semaphore_Control *)
-    _Objects_Allocate( &_POSIX_Semaphore_Information );
+    _Objects_Allocate_unprotected( &_POSIX_Semaphore_Information );
 }
 
-
 /**
  *  @brief POSIX Semaphore Free
  *
diff --git a/cpukit/posix/src/conddestroy.c b/cpukit/posix/src/conddestroy.c
index 75bf4cd621..cd437a9114 100644
--- a/cpukit/posix/src/conddestroy.c
+++ b/cpukit/posix/src/conddestroy.c
@@ -38,6 +38,7 @@ int pthread_cond_destroy(
   POSIX_Condition_variables_Control *the_cond;
   Objects_Locations                  location;
 
+  _Objects_Allocator_lock();
   the_cond = _POSIX_Condition_variables_Get( cond, &location );
   switch ( location ) {
 
@@ -45,6 +46,7 @@ int pthread_cond_destroy(
 
       if ( _Thread_queue_First( &the_cond->Wait_queue ) ) {
         _Objects_Put( &the_cond->Object );
+        _Objects_Allocator_unlock();
         return EBUSY;
       }
 
@@ -52,9 +54,9 @@ int pthread_cond_destroy(
         &_POSIX_Condition_variables_Information,
         &the_cond->Object
       );
-
-      _POSIX_Condition_variables_Free( the_cond );
       _Objects_Put( &the_cond->Object );
+      _POSIX_Condition_variables_Free( the_cond );
+      _Objects_Allocator_unlock();
       return 0;
 
 #if defined(RTEMS_MULTIPROCESSING)
@@ -64,5 +66,7 @@ int pthread_cond_destroy(
       break;
   }
 
+  _Objects_Allocator_unlock();
+
   return EINVAL;
 }
diff --git a/cpukit/posix/src/condinit.c b/cpukit/posix/src/condinit.c
index a69bc8cfdc..81575f2b17 100644
--- a/cpukit/posix/src/condinit.c
+++ b/cpukit/posix/src/condinit.c
@@ -51,12 +51,10 @@ int pthread_cond_init(
   if ( !the_attr->is_initialized )
     return EINVAL;
 
-  _Thread_Disable_dispatch();
-
   the_cond = _POSIX_Condition_variables_Allocate();
 
   if ( !the_cond ) {
-    _Thread_Enable_dispatch();
+    _Objects_Allocator_unlock();
     return ENOMEM;
   }
 
@@ -79,7 +77,7 @@ int pthread_cond_init(
 
   *cond = the_cond->Object.id;
 
-  _Thread_Enable_dispatch();
+  _Objects_Allocator_unlock();
 
   return 0;
 }
diff --git a/cpukit/posix/src/keycreate.c b/cpukit/posix/src/keycreate.c
index a7f6c915cc..245ac9e3f3 100644
--- a/cpukit/posix/src/keycreate.c
+++ b/cpukit/posix/src/keycreate.c
@@ -38,18 +38,16 @@ int pthread_key_create(
 {
   POSIX_Keys_Control  *the_key;
 
-  _Thread_Disable_dispatch();
-
   the_key = _POSIX_Keys_Allocate();
 
   if ( !the_key ) {
-    _Thread_Enable_dispatch();
+    _Objects_Allocator_unlock();
     return EAGAIN;
   }
 
   the_key->destructor = destructor;
   _Objects_Open_u32( &_POSIX_Keys_Information, &the_key->Object, 0 );
   *key = the_key->Object.id;
-  _Thread_Enable_dispatch();
+  _Objects_Allocator_unlock();
   return 0;
 }
diff --git a/cpukit/posix/src/keydelete.c b/cpukit/posix/src/keydelete.c
index cd2b39802d..392558f0f8 100644
--- a/cpukit/posix/src/keydelete.c
+++ b/cpukit/posix/src/keydelete.c
@@ -38,6 +38,7 @@ int pthread_key_delete(
   POSIX_Keys_Control *the_key;
   Objects_Locations   location;
 
+  _Objects_Allocator_lock();
   the_key = _POSIX_Keys_Get( key, &location );
   switch ( location ) {
 
@@ -50,6 +51,7 @@ int pthread_key_delete(
        */
       _POSIX_Keys_Free( the_key );
       _Objects_Put(&the_key->Object);
+      _Objects_Allocator_unlock();
       return 0;
 
 #if defined(RTEMS_MULTIPROCESSING)
@@ -59,5 +61,7 @@ int pthread_key_delete(
       break;
   }
 
+  _Objects_Allocator_unlock();
+
   return EINVAL;
 }
diff --git a/cpukit/posix/src/mqueueclose.c b/cpukit/posix/src/mqueueclose.c
index 152fc7ec46..72a7cdc40e 100644
--- a/cpukit/posix/src/mqueueclose.c
+++ b/cpukit/posix/src/mqueueclose.c
@@ -57,6 +57,7 @@ int mq_close(
   POSIX_Message_queue_Control_fd *the_mq_fd;
   Objects_Locations               location;
 
+  _Objects_Allocator_lock();
   the_mq_fd = _POSIX_Message_queue_Get_fd( mqdes, &location );
   if ( location == OBJECTS_LOCAL ) {
       /* OBJECTS_LOCAL:
@@ -79,9 +80,12 @@ int mq_close(
       _POSIX_Message_queue_Free_fd( the_mq_fd );
 
       _Objects_Put( &the_mq_fd->Object );
+      _Objects_Allocator_unlock();
       return 0;
    }
 
+   _Objects_Allocator_unlock();
+
    /*
     *  OBJECTS_REMOTE:
     *  OBJECTS_ERROR:
diff --git a/cpukit/posix/src/mqueuecreatesupp.c b/cpukit/posix/src/mqueuecreatesupp.c
index 056d35df1b..3be64b4cc4 100644
--- a/cpukit/posix/src/mqueuecreatesupp.c
+++ b/cpukit/posix/src/mqueuecreatesupp.c
@@ -62,8 +62,6 @@ int _POSIX_Message_queue_Create_support(
 
   /* length of name has already been validated */
 
-  _Thread_Disable_dispatch();
-
   /*
    *  There is no real basis for the default values.  They will work
    *  but were not compared against any existing implementation for
@@ -75,12 +73,10 @@ int _POSIX_Message_queue_Create_support(
     attr.mq_msgsize = 16;
   } else {
     if ( attr_ptr->mq_maxmsg <= 0 ){
-      _Thread_Enable_dispatch();
       rtems_set_errno_and_return_minus_one( EINVAL );
     }
 
     if ( attr_ptr->mq_msgsize <= 0 ){
-      _Thread_Enable_dispatch();
       rtems_set_errno_and_return_minus_one( EINVAL );
     }
 
@@ -89,7 +85,7 @@ int _POSIX_Message_queue_Create_support(
 
   the_mq = _POSIX_Message_queue_Allocate();
   if ( !the_mq ) {
-    _Thread_Enable_dispatch();
+    _Objects_Allocator_unlock();
     rtems_set_errno_and_return_minus_one( ENFILE );
   }
 
@@ -100,7 +96,7 @@ int _POSIX_Message_queue_Create_support(
   name = _Workspace_String_duplicate( name_arg, name_len );
   if ( !name ) {
     _POSIX_Message_queue_Free( the_mq );
-    _Thread_Enable_dispatch();
+    _Objects_Allocator_unlock();
     rtems_set_errno_and_return_minus_one( ENOMEM );
   }
 
@@ -128,7 +124,7 @@ int _POSIX_Message_queue_Create_support(
 
     _POSIX_Message_queue_Free( the_mq );
     _Workspace_Free(name);
-    _Thread_Enable_dispatch();
+    _Objects_Allocator_unlock();
     rtems_set_errno_and_return_minus_one( ENOSPC );
   }
 
@@ -140,6 +136,6 @@ int _POSIX_Message_queue_Create_support(
 
   *message_queue = the_mq;
 
-  _Thread_Enable_dispatch();
+  _Objects_Allocator_unlock();
   return 0;
 }
diff --git a/cpukit/posix/src/mqueueopen.c b/cpukit/posix/src/mqueueopen.c
index b33fc95d7a..43e4082b63 100644
--- a/cpukit/posix/src/mqueueopen.c
+++ b/cpukit/posix/src/mqueueopen.c
@@ -72,8 +72,6 @@ mqd_t mq_open(
   Objects_Locations               location;
   size_t                          name_len;
 
-  _Thread_Disable_dispatch();
-
   if ( oflag & O_CREAT ) {
     va_start(arg, oflag);
     mode = va_arg( arg, mode_t );
@@ -83,7 +81,7 @@ mqd_t mq_open(
 
   the_mq_fd = _POSIX_Message_queue_Allocate_fd();
   if ( !the_mq_fd ) {
-    _Thread_Enable_dispatch();
+    _Objects_Allocator_unlock();
     rtems_set_errno_and_return_minus_one( ENFILE );
   }
   the_mq_fd->oflag = oflag;
@@ -103,7 +101,7 @@ mqd_t mq_open(
      */
     if ( !( status == ENOENT && (oflag & O_CREAT) ) ) {
       _POSIX_Message_queue_Free_fd( the_mq_fd );
-      _Thread_Enable_dispatch();
+      _Objects_Allocator_unlock();
       rtems_set_errno_and_return_minus_one_cast( status, mqd_t );
     }
 
@@ -113,7 +111,7 @@ mqd_t mq_open(
      */
     if ( (oflag & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL) ) {
       _POSIX_Message_queue_Free_fd( the_mq_fd );
-      _Thread_Enable_dispatch();
+      _Objects_Allocator_unlock();
       rtems_set_errno_and_return_minus_one_cast( EEXIST, mqd_t );
     }
 
@@ -130,7 +128,7 @@ mqd_t mq_open(
       NULL
     );
     _Thread_Enable_dispatch();
-    _Thread_Enable_dispatch();
+    _Objects_Allocator_unlock();
     return (mqd_t)the_mq_fd->Object.id;
 
   }
@@ -152,7 +150,7 @@ mqd_t mq_open(
    */
   if ( status == -1 ) {
     _POSIX_Message_queue_Free_fd( the_mq_fd );
-    _Thread_Enable_dispatch();
+    _Objects_Allocator_unlock();
     return (mqd_t) -1;
   }
 
@@ -163,7 +161,7 @@ mqd_t mq_open(
     NULL
   );
 
-  _Thread_Enable_dispatch();
+  _Objects_Allocator_unlock();
 
   return (mqd_t) the_mq_fd->Object.id;
 }
diff --git a/cpukit/posix/src/mqueueunlink.c b/cpukit/posix/src/mqueueunlink.c
index 47a0f5a368..92b1976a43 100644
--- a/cpukit/posix/src/mqueueunlink.c
+++ b/cpukit/posix/src/mqueueunlink.c
@@ -46,11 +46,13 @@ int mq_unlink(
   Objects_Id                            the_mq_id;
   size_t                                name_len;
 
+  _Objects_Allocator_lock();
   _Thread_Disable_dispatch();
 
   status = _POSIX_Message_queue_Name_to_id( name, &the_mq_id, &name_len );
    if ( status != 0 ) {
     _Thread_Enable_dispatch();
+    _Objects_Allocator_unlock();
     rtems_set_errno_and_return_minus_one( status );
    }
 
@@ -64,5 +66,6 @@ int mq_unlink(
   _POSIX_Message_queue_Delete( the_mq );
 
   _Thread_Enable_dispatch();
+   _Objects_Allocator_unlock();
   return 0;
 }
diff --git a/cpukit/posix/src/mutexdestroy.c b/cpukit/posix/src/mutexdestroy.c
index 0fad9a915f..fce78af715 100644
--- a/cpukit/posix/src/mutexdestroy.c
+++ b/cpukit/posix/src/mutexdestroy.c
@@ -39,6 +39,7 @@ int pthread_mutex_destroy(
   register POSIX_Mutex_Control *the_mutex;
   Objects_Locations             location;
 
+  _Objects_Allocator_lock();
   the_mutex = _POSIX_Mutex_Get( mutex, &location );
   switch ( location ) {
 
@@ -50,15 +51,16 @@ int pthread_mutex_destroy(
 
       if ( _CORE_mutex_Is_locked( &the_mutex->Mutex ) ) {
         _Objects_Put( &the_mutex->Object );
+        _Objects_Allocator_unlock();
         return EBUSY;
       }
 
       _Objects_Close( &_POSIX_Mutex_Information, &the_mutex->Object );
-
       _CORE_mutex_Flush( &the_mutex->Mutex, NULL, EINVAL );
-
-      _POSIX_Mutex_Free( the_mutex );
       _Objects_Put( &the_mutex->Object );
+      _POSIX_Mutex_Free( the_mutex );
+      _Objects_Allocator_unlock();
+
       return 0;
 
 #if defined(RTEMS_MULTIPROCESSING)
@@ -68,5 +70,7 @@ int pthread_mutex_destroy(
       break;
   }
 
+  _Objects_Allocator_unlock();
+
   return EINVAL;
 }
diff --git a/cpukit/posix/src/mutexinit.c b/cpukit/posix/src/mutexinit.c
index d41b4c79ba..73d3101b28 100644
--- a/cpukit/posix/src/mutexinit.c
+++ b/cpukit/posix/src/mutexinit.c
@@ -149,15 +149,10 @@ int pthread_mutex_init(
   }
 #endif
 
-  /*
-   *  Enter a dispatching critical section and begin to do the real work.
-   */
-  _Thread_Disable_dispatch();
-
   the_mutex = _POSIX_Mutex_Allocate();
 
   if ( !the_mutex ) {
-    _Thread_Enable_dispatch();
+    _Objects_Allocator_unlock();
     return EAGAIN;
   }
 
@@ -188,6 +183,6 @@ int pthread_mutex_init(
 
   *mutex = the_mutex->Object.id;
 
-  _Thread_Enable_dispatch();
+  _Objects_Allocator_unlock();
   return 0;
 }
diff --git a/cpukit/posix/src/pbarrierdestroy.c b/cpukit/posix/src/pbarrierdestroy.c
index d2eb50530d..4b9a0fdca9 100644
--- a/cpukit/posix/src/pbarrierdestroy.c
+++ b/cpukit/posix/src/pbarrierdestroy.c
@@ -45,6 +45,7 @@ int pthread_barrier_destroy(
   if ( !barrier )
     return EINVAL;
 
+  _Objects_Allocator_lock();
   the_barrier = _POSIX_Barrier_Get( barrier, &location );
   switch ( location ) {
 
@@ -55,10 +56,10 @@ int pthread_barrier_destroy(
       }
 
       _Objects_Close( &_POSIX_Barrier_Information, &the_barrier->Object );
+      _Objects_Put( &the_barrier->Object );
 
       _POSIX_Barrier_Free( the_barrier );
-
-      _Objects_Put( &the_barrier->Object );
+      _Objects_Allocator_unlock();
       return 0;
 
 #if defined(RTEMS_MULTIPROCESSING)
@@ -68,5 +69,7 @@ int pthread_barrier_destroy(
       break;
   }
 
+  _Objects_Allocator_unlock();
+
   return EINVAL;
 }
diff --git a/cpukit/posix/src/pbarrierinit.c b/cpukit/posix/src/pbarrierinit.c
index f2dda7827b..956085658b 100644
--- a/cpukit/posix/src/pbarrierinit.c
+++ b/cpukit/posix/src/pbarrierinit.c
@@ -92,15 +92,10 @@ int pthread_barrier_init(
   the_attributes.discipline    = CORE_BARRIER_AUTOMATIC_RELEASE;
   the_attributes.maximum_count = count;
 
-  /*
-   * Enter dispatching critical section to allocate and initialize barrier
-   */
-  _Thread_Disable_dispatch();             /* prevents deletion */
-
   the_barrier = _POSIX_Barrier_Allocate();
 
   if ( !the_barrier ) {
-    _Thread_Enable_dispatch();
+    _Objects_Allocator_unlock();
     return EAGAIN;
   }
 
@@ -112,10 +107,7 @@ int pthread_barrier_init(
     0
   );
 
-  /*
-   * Exit the critical section and return the user an operational barrier
-   */
   *barrier = the_barrier->Object.id;
-  _Thread_Enable_dispatch();
+  _Objects_Allocator_unlock();
   return 0;
 }
diff --git a/cpukit/posix/src/prwlockdestroy.c b/cpukit/posix/src/prwlockdestroy.c
index 9054e921de..d1261ca4fb 100644
--- a/cpukit/posix/src/prwlockdestroy.c
+++ b/cpukit/posix/src/prwlockdestroy.c
@@ -44,6 +44,7 @@ int pthread_rwlock_destroy(
   if ( !rwlock )
     return EINVAL;
 
+  _Objects_Allocator_lock();
   the_rwlock = _POSIX_RWLock_Get( rwlock, &location );
   switch ( location ) {
 
@@ -53,6 +54,7 @@ int pthread_rwlock_destroy(
        */
       if ( _Thread_queue_First( &the_rwlock->RWLock.Wait_queue ) != NULL ) {
         _Objects_Put( &the_rwlock->Object );
+        _Objects_Allocator_unlock();
         return EBUSY;
       }
 
@@ -61,10 +63,10 @@ int pthread_rwlock_destroy(
        */
 
       _Objects_Close( &_POSIX_RWLock_Information, &the_rwlock->Object );
-
+      _Objects_Put( &the_rwlock->Object );
       _POSIX_RWLock_Free( the_rwlock );
+      _Objects_Allocator_unlock();
 
-      _Objects_Put( &the_rwlock->Object );
       return 0;
 
 #if defined(RTEMS_MULTIPROCESSING)
@@ -74,5 +76,7 @@ int pthread_rwlock_destroy(
       break;
   }
 
+  _Objects_Allocator_unlock();
+
   return EINVAL;
 }
diff --git a/cpukit/posix/src/prwlockinit.c b/cpukit/posix/src/prwlockinit.c
index 488b46b8c4..94973f6b78 100644
--- a/cpukit/posix/src/prwlockinit.c
+++ b/cpukit/posix/src/prwlockinit.c
@@ -88,15 +88,10 @@ int pthread_rwlock_init(
    */
   _CORE_RWLock_Initialize_attributes( &the_attributes );
 
-  /*
-   * Enter dispatching critical section to allocate and initialize RWLock
-   */
-  _Thread_Disable_dispatch();             /* prevents deletion */
-
   the_rwlock = _POSIX_RWLock_Allocate();
 
   if ( !the_rwlock ) {
-    _Thread_Enable_dispatch();
+    _Objects_Allocator_unlock();
     return EAGAIN;
   }
 
@@ -110,6 +105,6 @@ int pthread_rwlock_init(
 
   *rwlock = the_rwlock->Object.id;
 
-  _Thread_Enable_dispatch();
+  _Objects_Allocator_unlock();
   return 0;
 }
diff --git a/cpukit/posix/src/pspindestroy.c b/cpukit/posix/src/pspindestroy.c
index 7795a33764..ab45ad1e92 100644
--- a/cpukit/posix/src/pspindestroy.c
+++ b/cpukit/posix/src/pspindestroy.c
@@ -45,6 +45,7 @@ int pthread_spin_destroy(
   if ( !spinlock )
     return EINVAL;
 
+  _Objects_Allocator_lock();
   the_spinlock = _POSIX_Spinlock_Get( spinlock, &location );
   switch ( location ) {
 
@@ -55,10 +56,10 @@ int pthread_spin_destroy(
       }
 
       _Objects_Close( &_POSIX_Spinlock_Information, &the_spinlock->Object );
-
+      _Objects_Put( &the_spinlock->Object );
       _POSIX_Spinlock_Free( the_spinlock );
+      _Objects_Allocator_unlock();
 
-      _Objects_Put( &the_spinlock->Object );
       return 0;
 
 #if defined(RTEMS_MULTIPROCESSING)
@@ -68,5 +69,7 @@ int pthread_spin_destroy(
       break;
   }
 
+  _Objects_Allocator_unlock();
+
   return EINVAL;
 }
diff --git a/cpukit/posix/src/pspininit.c b/cpukit/posix/src/pspininit.c
index 6030ed00e5..02b07c8468 100644
--- a/cpukit/posix/src/pspininit.c
+++ b/cpukit/posix/src/pspininit.c
@@ -49,7 +49,6 @@ int pthread_spin_init(
   POSIX_Spinlock_Control   *the_spinlock;
   CORE_spinlock_Attributes  attributes;
 
-
   if ( !spinlock )
     return EINVAL;
 
@@ -61,12 +60,10 @@ int pthread_spin_init(
       return EINVAL;
   }
 
-  _Thread_Disable_dispatch();             /* prevents deletion */
-
   the_spinlock = _POSIX_Spinlock_Allocate();
 
   if ( !the_spinlock ) {
-    _Thread_Enable_dispatch();
+    _Objects_Allocator_unlock();
     return EAGAIN;
   }
 
@@ -78,6 +75,6 @@ int pthread_spin_init(
 
   *spinlock = the_spinlock->Object.id;
 
-  _Thread_Enable_dispatch();
+  _Objects_Allocator_unlock();
   return 0;
 }
diff --git a/cpukit/posix/src/pthreadcreate.c b/cpukit/posix/src/pthreadcreate.c
index 5a6d929959..8d031335cc 100644
--- a/cpukit/posix/src/pthreadcreate.c
+++ b/cpukit/posix/src/pthreadcreate.c
@@ -156,18 +156,13 @@ int pthread_create(
   #endif
 
   /*
-   *  Lock the allocator mutex for protection
-   */
-  _RTEMS_Lock_allocator();
-
-  /*
    *  Allocate the thread control block.
    *
    *  NOTE:  Global threads are not currently supported.
    */
   the_thread = _POSIX_Threads_Allocate();
   if ( !the_thread ) {
-    _RTEMS_Unlock_allocator();
+    _Objects_Allocator_unlock();
     return EAGAIN;
   }
 
@@ -190,7 +185,7 @@ int pthread_create(
   );
   if ( !status ) {
     _POSIX_Threads_Free( the_thread );
-    _RTEMS_Unlock_allocator();
+    _Objects_Allocator_unlock();
     return EAGAIN;
   }
 
@@ -235,7 +230,7 @@ int pthread_create(
     if ( !status ) {
       _Thread_Enable_dispatch();
       _POSIX_Threads_Free( the_thread );
-      _RTEMS_Unlock_allocator();
+      _Objects_Allocator_unlock();
       return EINVAL;
     }
   #endif
@@ -254,6 +249,6 @@ int pthread_create(
    */
   *thread = the_thread->Object.id;
 
-  _RTEMS_Unlock_allocator();
+  _Objects_Allocator_unlock();
   return 0;
 }
diff --git a/cpukit/posix/src/semaphorecreatesupp.c b/cpukit/posix/src/semaphorecreatesupp.c
index 54b5b46aee..7751a58c0e 100644
--- a/cpukit/posix/src/semaphorecreatesupp.c
+++ b/cpukit/posix/src/semaphorecreatesupp.c
@@ -56,11 +56,8 @@ int _POSIX_Semaphore_Create_support(
   if (pshared != 0)
     rtems_set_errno_and_return_minus_one( ENOSYS );
 
-  _Thread_Disable_dispatch();
-
-  the_semaphore = _POSIX_Semaphore_Allocate();
+  the_semaphore = _POSIX_Semaphore_Allocate_unprotected();
   if ( !the_semaphore ) {
-    _Thread_Enable_dispatch();
     rtems_set_errno_and_return_minus_one( ENOSPC );
   }
 
@@ -72,7 +69,6 @@ int _POSIX_Semaphore_Create_support(
     name = _Workspace_String_duplicate( name_arg, name_len );
     if ( !name ) {
       _POSIX_Semaphore_Free( the_semaphore );
-      _Thread_Enable_dispatch();
       rtems_set_errno_and_return_minus_one( ENOMEM );
     }
   } else {
@@ -120,6 +116,5 @@ int _POSIX_Semaphore_Create_support(
 
   *the_sem = the_semaphore;
 
-  _Thread_Enable_dispatch();
   return 0;
 }
diff --git a/cpukit/posix/src/semclose.c b/cpukit/posix/src/semclose.c
index 1c205bfb36..9dedc34c1a 100644
--- a/cpukit/posix/src/semclose.c
+++ b/cpukit/posix/src/semclose.c
@@ -38,6 +38,7 @@ int sem_close(
   POSIX_Semaphore_Control          *the_semaphore;
   Objects_Locations                 location;
 
+  _Objects_Allocator_lock();
   the_semaphore = _POSIX_Semaphore_Get( sem, &location );
   switch ( location ) {
 
@@ -45,6 +46,7 @@ int sem_close(
       the_semaphore->open_count -= 1;
       _POSIX_Semaphore_Delete( the_semaphore );
       _Objects_Put( &the_semaphore->Object );
+      _Objects_Allocator_unlock();
       return 0;
 
 #if defined(RTEMS_MULTIPROCESSING)
@@ -54,5 +56,7 @@ int sem_close(
       break;
   }
 
+  _Objects_Allocator_unlock();
+
   rtems_set_errno_and_return_minus_one( EINVAL );
 }
diff --git a/cpukit/posix/src/semdestroy.c b/cpukit/posix/src/semdestroy.c
index 8c3f079f64..1c695bb837 100644
--- a/cpukit/posix/src/semdestroy.c
+++ b/cpukit/posix/src/semdestroy.c
@@ -38,6 +38,7 @@ int sem_destroy(
   POSIX_Semaphore_Control          *the_semaphore;
   Objects_Locations                 location;
 
+  _Objects_Allocator_lock();
   the_semaphore = _POSIX_Semaphore_Get( sem, &location );
   switch ( location ) {
 
@@ -53,6 +54,7 @@ int sem_destroy(
 
       _POSIX_Semaphore_Delete( the_semaphore );
       _Objects_Put( &the_semaphore->Object );
+      _Objects_Allocator_unlock();
       return 0;
 
 #if defined(RTEMS_MULTIPROCESSING)
@@ -62,5 +64,7 @@ int sem_destroy(
       break;
   }
 
+  _Objects_Allocator_unlock();
+
   rtems_set_errno_and_return_minus_one( EINVAL );
 }
diff --git a/cpukit/posix/src/seminit.c b/cpukit/posix/src/seminit.c
index 466b2d0a0c..a55a1c4e1b 100644
--- a/cpukit/posix/src/seminit.c
+++ b/cpukit/posix/src/seminit.c
@@ -47,6 +47,7 @@ int sem_init(
   if ( !sem )
     rtems_set_errno_and_return_minus_one( EINVAL );
 
+  _Objects_Allocator_lock();
   status = _POSIX_Semaphore_Create_support(
     NULL,
     0,
@@ -54,6 +55,7 @@ int sem_init(
     value,
     &the_semaphore
   );
+  _Objects_Allocator_unlock();
 
   if ( status != -1 )
     *sem = the_semaphore->Object.id;
diff --git a/cpukit/posix/src/semopen.c b/cpukit/posix/src/semopen.c
index 20e2e92c7b..0b98ca60f9 100644
--- a/cpukit/posix/src/semopen.c
+++ b/cpukit/posix/src/semopen.c
@@ -66,8 +66,6 @@ sem_t *sem_open(
   Objects_Locations          location;
   size_t                     name_len;
 
-  _Thread_Disable_dispatch();
-
   if ( oflag & O_CREAT ) {
     va_start(arg, oflag);
     mode = va_arg( arg, mode_t );
@@ -75,6 +73,7 @@ sem_t *sem_open(
     va_end(arg);
   }
 
+  _Objects_Allocator_lock();
   status = _POSIX_Semaphore_Name_to_id( name, &the_semaphore_id, &name_len );
 
   /*
@@ -92,7 +91,7 @@ sem_t *sem_open(
      */
 
     if ( !( status == ENOENT && (oflag & O_CREAT) ) ) {
-      _Thread_Enable_dispatch();
+      _Objects_Allocator_unlock();
       rtems_set_errno_and_return_minus_one_cast( status, sem_t * );
     }
   } else {
@@ -102,14 +101,14 @@ sem_t *sem_open(
      */
 
     if ( (oflag & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL) ) {
-      _Thread_Enable_dispatch();
+      _Objects_Allocator_unlock();
       rtems_set_errno_and_return_minus_one_cast( EEXIST, sem_t * );
     }
 
     the_semaphore = _POSIX_Semaphore_Get( (sem_t *) &the_semaphore_id, &location );
     the_semaphore->open_count += 1;
     _Thread_Enable_dispatch();
-    _Thread_Enable_dispatch();
+    _Objects_Allocator_unlock();
     goto return_id;
   }
 
@@ -130,7 +129,7 @@ sem_t *sem_open(
    * errno was set by Create_support, so don't set it again.
    */
 
-  _Thread_Enable_dispatch();
+  _Objects_Allocator_unlock();
 
   if ( status == -1 )
     return SEM_FAILED;
diff --git a/cpukit/posix/src/semunlink.c b/cpukit/posix/src/semunlink.c
index 180facc381..40d5660350 100644
--- a/cpukit/posix/src/semunlink.c
+++ b/cpukit/posix/src/semunlink.c
@@ -35,11 +35,12 @@ int sem_unlink(
   const char *name
 )
 {
-  int  status;
-  POSIX_Semaphore_Control          *the_semaphore;
-  Objects_Id the_semaphore_id;
-  size_t name_len;
+  int                      status;
+  POSIX_Semaphore_Control *the_semaphore;
+  Objects_Id               the_semaphore_id;
+  size_t                   name_len;
 
+  _Objects_Allocator_lock();
   _Thread_Disable_dispatch();
 
   status = _POSIX_Semaphore_Name_to_id( name, &the_semaphore_id, &name_len );
@@ -58,5 +59,7 @@ int sem_unlink(
   _POSIX_Semaphore_Delete( the_semaphore );
 
   _Thread_Enable_dispatch();
+  _Objects_Allocator_unlock();
+
   return 0;
 }
diff --git a/cpukit/posix/src/timercreate.c b/cpukit/posix/src/timercreate.c
index f55e2db8d6..6d822b3928 100644
--- a/cpukit/posix/src/timercreate.c
+++ b/cpukit/posix/src/timercreate.c
@@ -66,21 +66,19 @@ int timer_create(
        rtems_set_errno_and_return_minus_one( EINVAL );
   }
 
-  _Thread_Disable_dispatch();         /* to prevent deletion */
-
   /*
    *  Allocate a timer
    */
   ptimer = _POSIX_Timer_Allocate();
   if ( !ptimer ) {
-    _Objects_Put( &ptimer->Object );
+    _Objects_Allocator_unlock();
     rtems_set_errno_and_return_minus_one( EAGAIN );
   }
 
   /* The data of the created timer are stored to use them later */
 
   ptimer->state     = POSIX_TIMER_STATE_CREATE_NEW;
-  ptimer->thread_id = _Thread_Executing->Object.id;
+  ptimer->thread_id = _Thread_Get_executing()->Object.id;
 
   if ( evp != NULL ) {
     ptimer->inf.sigev_notify = evp->sigev_notify;
@@ -98,6 +96,6 @@ int timer_create(
   _Objects_Open_u32(&_POSIX_Timer_Information, &ptimer->Object, 0);
 
   *timerid  = ptimer->Object.id;
-  _Objects_Put( &ptimer->Object );
+  _Objects_Allocator_unlock();
   return 0;
 }
diff --git a/cpukit/posix/src/timerdelete.c b/cpukit/posix/src/timerdelete.c
index 5ebf8f8660..71b25faed9 100644
--- a/cpukit/posix/src/timerdelete.c
+++ b/cpukit/posix/src/timerdelete.c
@@ -47,6 +47,7 @@ int timer_delete(
   POSIX_Timer_Control *ptimer;
   Objects_Locations    location;
 
+  _Objects_Allocator_lock();
   ptimer = _POSIX_Timer_Get( timerid, &location );
   switch ( location ) {
 
@@ -54,8 +55,10 @@ int timer_delete(
       _Objects_Close( &_POSIX_Timer_Information, &ptimer->Object );
       ptimer->state = POSIX_TIMER_STATE_FREE;
       (void) _Watchdog_Remove( &ptimer->Timer );
-      _POSIX_Timer_Free( ptimer );
       _Objects_Put( &ptimer->Object );
+      _POSIX_Timer_Free( ptimer );
+      _Objects_Allocator_unlock();
+
       return 0;
 
 #if defined(RTEMS_MULTIPROCESSING)
@@ -65,5 +68,7 @@ int timer_delete(
       break;
   }
 
+  _Objects_Allocator_unlock();
+
   rtems_set_errno_and_return_minus_one( EINVAL );
 }
diff --git a/cpukit/rtems/Makefile.am b/cpukit/rtems/Makefile.am
index f89a896f2d..cf8ca3bb67 100644
--- a/cpukit/rtems/Makefile.am
+++ b/cpukit/rtems/Makefile.am
@@ -175,7 +175,6 @@ librtems_a_SOURCES += src/rtemstimerdata.c
 
 ## MESSAGE_QUEUE_C_FILES
 librtems_a_SOURCES += src/msg.c
-librtems_a_SOURCES += src/msgqallocate.c
 librtems_a_SOURCES += src/msgqbroadcast.c
 librtems_a_SOURCES += src/msgqcreate.c
 librtems_a_SOURCES += src/msgqdelete.c
diff --git a/cpukit/rtems/include/rtems/rtems/messageimpl.h b/cpukit/rtems/include/rtems/rtems/messageimpl.h
index da87fd1d6f..714fb617dc 100644
--- a/cpukit/rtems/include/rtems/rtems/messageimpl.h
+++ b/cpukit/rtems/include/rtems/rtems/messageimpl.h
@@ -90,16 +90,6 @@ rtems_status_code _Message_queue_Submit(
 );
 
 /**
- * @brief Message Queue Allocate
- *
- * This function allocates a message queue control block from
- * the inactive chain of free message queue control blocks.
- *
- * @retval the_message_queue filled in if successful, NULL otherwise
- */
-Message_queue_Control *_Message_queue_Allocate (void);
-
-/**
  * @brief Message queue Translate Core Message Queue Return Code
  *
  * This function returns a RTEMS status code based on
@@ -162,6 +152,12 @@ RTEMS_INLINE_ROUTINE Message_queue_Control *_Message_queue_Get (
      _Objects_Get( &_Message_queue_Information, id, location );
 }
 
+RTEMS_INLINE_ROUTINE Message_queue_Control *_Message_queue_Allocate( void )
+{
+  return (Message_queue_Control *)
+    _Objects_Allocate( &_Message_queue_Information );
+}
+
 /**@}*/
 
 #ifdef __cplusplus
diff --git a/cpukit/rtems/include/rtems/rtems/tasksimpl.h b/cpukit/rtems/include/rtems/rtems/tasksimpl.h
index 2a99812e26..c86d5914c2 100644
--- a/cpukit/rtems/include/rtems/rtems/tasksimpl.h
+++ b/cpukit/rtems/include/rtems/rtems/tasksimpl.h
@@ -77,17 +77,14 @@ void _RTEMS_Tasks_Invoke_task_variable_dtor(
   rtems_task_variable_t *tvp
 );
 
-/**
- *  @brief Allocates a task control block.
- *
- *  This function allocates a task control block from
- *  the inactive chain of free task control blocks.
- */
-RTEMS_INLINE_ROUTINE Thread_Control *_RTEMS_tasks_Allocate( void )
+RTEMS_INLINE_ROUTINE Thread_Control *_RTEMS_tasks_Allocate(void)
 {
+  _Objects_Allocator_lock();
+
   _Thread_Kill_zombies();
 
-  return (Thread_Control *) _Objects_Allocate( &_RTEMS_tasks_Information );
+  return (Thread_Control *)
+    _Objects_Allocate_unprotected( &_RTEMS_tasks_Information );
 }
 
 /**
diff --git a/cpukit/rtems/src/barriercreate.c b/cpukit/rtems/src/barriercreate.c
index e865774b17..12a917fe60 100644
--- a/cpukit/rtems/src/barriercreate.c
+++ b/cpukit/rtems/src/barriercreate.c
@@ -68,12 +68,10 @@ rtems_status_code rtems_barrier_create(
     the_attributes.discipline = CORE_BARRIER_MANUAL_RELEASE;
   the_attributes.maximum_count = maximum_waiters;
 
-  _Thread_Disable_dispatch();             /* prevents deletion */
-
   the_barrier = _Barrier_Allocate();
 
   if ( !the_barrier ) {
-    _Thread_Enable_dispatch();
+    _Objects_Allocator_unlock();
     return RTEMS_TOO_MANY;
   }
 
@@ -89,6 +87,6 @@ rtems_status_code rtems_barrier_create(
 
   *id = the_barrier->Object.id;
 
-  _Thread_Enable_dispatch();
+  _Objects_Allocator_unlock();
   return RTEMS_SUCCESSFUL;
 }
diff --git a/cpukit/rtems/src/barrierdelete.c b/cpukit/rtems/src/barrierdelete.c
index 90fff5e8ef..2ea15502b3 100644
--- a/cpukit/rtems/src/barrierdelete.c
+++ b/cpukit/rtems/src/barrierdelete.c
@@ -28,6 +28,7 @@ rtems_status_code rtems_barrier_delete(
   Barrier_Control   *the_barrier;
   Objects_Locations  location;
 
+  _Objects_Allocator_lock();
   the_barrier = _Barrier_Get( id, &location );
   switch ( location ) {
 
@@ -39,10 +40,9 @@ rtems_status_code rtems_barrier_delete(
       );
 
       _Objects_Close( &_Barrier_Information, &the_barrier->Object );
-
-      _Barrier_Free( the_barrier );
-
       _Objects_Put( &the_barrier->Object );
+      _Barrier_Free( the_barrier );
+      _Objects_Allocator_unlock();
       return RTEMS_SUCCESSFUL;
 
 #if defined(RTEMS_MULTIPROCESSING)
@@ -52,5 +52,7 @@ rtems_status_code rtems_barrier_delete(
       break;
   }
 
+  _Objects_Allocator_unlock();
+
   return RTEMS_INVALID_ID;
 }
diff --git a/cpukit/rtems/src/dpmemcreate.c b/cpukit/rtems/src/dpmemcreate.c
index 9ad1588a10..206a199c00 100644
--- a/cpukit/rtems/src/dpmemcreate.c
+++ b/cpukit/rtems/src/dpmemcreate.c
@@ -33,7 +33,7 @@ rtems_status_code rtems_port_create(
   rtems_id     *id
 )
 {
-  Dual_ported_memory_Control          *the_port;
+  Dual_ported_memory_Control *the_port;
 
   if ( !rtems_is_name_valid( name ) )
     return RTEMS_INVALID_NAME;
@@ -45,12 +45,10 @@ rtems_status_code rtems_port_create(
        !_Addresses_Is_aligned( external_start ) )
     return RTEMS_INVALID_ADDRESS;
 
-  _Thread_Disable_dispatch();             /* to prevent deletion */
-
   the_port = _Dual_ported_memory_Allocate();
 
   if ( !the_port ) {
-    _Thread_Enable_dispatch();
+    _Objects_Allocator_unlock();
     return RTEMS_TOO_MANY;
   }
 
@@ -65,6 +63,6 @@ rtems_status_code rtems_port_create(
   );
 
   *id = the_port->Object.id;
-  _Thread_Enable_dispatch();
+  _Objects_Allocator_unlock();
   return RTEMS_SUCCESSFUL;
 }
diff --git a/cpukit/rtems/src/dpmemdelete.c b/cpukit/rtems/src/dpmemdelete.c
index d6b42ffcc0..6f11a53a0b 100644
--- a/cpukit/rtems/src/dpmemdelete.c
+++ b/cpukit/rtems/src/dpmemdelete.c
@@ -32,13 +32,15 @@ rtems_status_code rtems_port_delete(
   Dual_ported_memory_Control          *the_port;
   Objects_Locations                    location;
 
+  _Objects_Allocator_lock();
   the_port = _Dual_ported_memory_Get( id, &location );
   switch ( location ) {
 
     case OBJECTS_LOCAL:
       _Objects_Close( &_Dual_ported_memory_Information, &the_port->Object );
-      _Dual_ported_memory_Free( the_port );
       _Objects_Put( &the_port->Object );
+      _Dual_ported_memory_Free( the_port );
+      _Objects_Allocator_unlock();
       return RTEMS_SUCCESSFUL;
 
 #if defined(RTEMS_MULTIPROCESSING)
@@ -48,5 +50,7 @@ rtems_status_code rtems_port_delete(
       break;
   }
 
+  _Objects_Allocator_unlock();
+
   return RTEMS_INVALID_ID;
 }
diff --git a/cpukit/rtems/src/msgqallocate.c b/cpukit/rtems/src/msgqallocate.c
deleted file mode 100644
index f5776f1687..0000000000
--- a/cpukit/rtems/src/msgqallocate.c
+++ /dev/null
@@ -1,37 +0,0 @@
-/**
- *  @file
- *
- *  @brief Message Queue Allocate
- *  @ingroup ClassicMessageQueue
- */
-
-/*
- *  COPYRIGHT (c) 1989-1999.
- *  On-Line Applications Research Corporation (OAR).
- *
- *  The license and distribution terms for this file may be
- *  found in the file LICENSE in this distribution or at
- *  http://www.rtems.org/license/LICENSE.
- */
-
-#if HAVE_CONFIG_H
-#include "config.h"
-#endif
-
-#include <rtems/system.h>
-#include <rtems/score/chain.h>
-#include <rtems/score/isr.h>
-#include <rtems/score/coremsgimpl.h>
-#include <rtems/score/thread.h>
-#include <rtems/score/wkspace.h>
-#include <rtems/rtems/status.h>
-#include <rtems/rtems/attrimpl.h>
-#include <rtems/rtems/messageimpl.h>
-#include <rtems/rtems/options.h>
-#include <rtems/rtems/support.h>
-
-Message_queue_Control *_Message_queue_Allocate(void)
-{
-  return (Message_queue_Control *)
-    _Objects_Allocate(&_Message_queue_Information);
-}
diff --git a/cpukit/rtems/src/msgqcreate.c b/cpukit/rtems/src/msgqcreate.c
index 6f60773458..b18f3b2591 100644
--- a/cpukit/rtems/src/msgqcreate.c
+++ b/cpukit/rtems/src/msgqcreate.c
@@ -81,12 +81,10 @@ rtems_status_code rtems_message_queue_create(
 #endif
 #endif
 
-  _Thread_Disable_dispatch();              /* protects object pointer */
-
   the_message_queue = _Message_queue_Allocate();
 
   if ( !the_message_queue ) {
-    _Thread_Enable_dispatch();
+    _Objects_Allocator_unlock();
     return RTEMS_TOO_MANY;
   }
 
@@ -95,7 +93,7 @@ rtems_status_code rtems_message_queue_create(
     !( _Objects_MP_Allocate_and_open( &_Message_queue_Information,
                               name, the_message_queue->Object.id, false ) ) ) {
     _Message_queue_Free( the_message_queue );
-    _Thread_Enable_dispatch();
+    _Objects_Allocator_unlock();
     return RTEMS_TOO_MANY;
   }
 #endif
@@ -120,7 +118,7 @@ rtems_status_code rtems_message_queue_create(
 #endif
 
     _Message_queue_Free( the_message_queue );
-    _Thread_Enable_dispatch();
+    _Objects_Allocator_unlock();
     return RTEMS_UNSATISFIED;
   }
 
@@ -142,6 +140,6 @@ rtems_status_code rtems_message_queue_create(
     );
 #endif
 
-  _Thread_Enable_dispatch();
+  _Objects_Allocator_unlock();
   return RTEMS_SUCCESSFUL;
 }
diff --git a/cpukit/rtems/src/msgqdelete.c b/cpukit/rtems/src/msgqdelete.c
index d3c07679f4..e2df2b9d9a 100644
--- a/cpukit/rtems/src/msgqdelete.c
+++ b/cpukit/rtems/src/msgqdelete.c
@@ -37,6 +37,7 @@ rtems_status_code rtems_message_queue_delete(
   Message_queue_Control          *the_message_queue;
   Objects_Locations               location;
 
+  _Objects_Allocator_lock();
   the_message_queue = _Message_queue_Get( id, &location );
   switch ( location ) {
 
@@ -54,8 +55,6 @@ rtems_status_code rtems_message_queue_delete(
         CORE_MESSAGE_QUEUE_STATUS_WAS_DELETED
       );
 
-      _Message_queue_Free( the_message_queue );
-
 #if defined(RTEMS_MULTIPROCESSING)
       if ( _Attributes_Is_global( the_message_queue->attribute_set ) ) {
         _Objects_MP_Close(
@@ -72,11 +71,13 @@ rtems_status_code rtems_message_queue_delete(
       }
 #endif
       _Objects_Put( &the_message_queue->Object );
+      _Message_queue_Free( the_message_queue );
+      _Objects_Allocator_unlock();
       return RTEMS_SUCCESSFUL;
 
 #if defined(RTEMS_MULTIPROCESSING)
     case OBJECTS_REMOTE:
-      _Thread_Dispatch();
+      _Objects_Allocator_unlock();
       return RTEMS_ILLEGAL_ON_REMOTE_OBJECT;
 #endif
 
@@ -84,5 +85,7 @@ rtems_status_code rtems_message_queue_delete(
       break;
   }
 
+  _Objects_Allocator_unlock();
+
   return RTEMS_INVALID_ID;
 }
diff --git a/cpukit/rtems/src/partcreate.c b/cpukit/rtems/src/partcreate.c
index 32758f8f65..e3544e71b2 100644
--- a/cpukit/rtems/src/partcreate.c
+++ b/cpukit/rtems/src/partcreate.c
@@ -53,7 +53,7 @@ rtems_status_code rtems_partition_create(
   rtems_id        *id
 )
 {
-   Partition_Control           *the_partition;
+  Partition_Control *the_partition;
 
   if ( !rtems_is_name_valid( name ) )
     return RTEMS_INVALID_NAME;
@@ -77,12 +77,10 @@ rtems_status_code rtems_partition_create(
     return RTEMS_MP_NOT_CONFIGURED;
 #endif
 
-  _Thread_Disable_dispatch();               /* prevents deletion */
-
   the_partition = _Partition_Allocate();
 
   if ( !the_partition ) {
-    _Thread_Enable_dispatch();
+    _Objects_Allocator_unlock();
     return RTEMS_TOO_MANY;
   }
 
@@ -91,7 +89,7 @@ rtems_status_code rtems_partition_create(
        !( _Objects_MP_Allocate_and_open( &_Partition_Information, name,
                             the_partition->Object.id, false ) ) ) {
     _Partition_Free( the_partition );
-    _Thread_Enable_dispatch();
+    _Objects_Allocator_unlock();
     return RTEMS_TOO_MANY;
   }
 #endif
@@ -122,6 +120,6 @@ rtems_status_code rtems_partition_create(
     );
 #endif
 
-  _Thread_Enable_dispatch();
+  _Objects_Allocator_unlock();
   return RTEMS_SUCCESSFUL;
 }
diff --git a/cpukit/rtems/src/partdelete.c b/cpukit/rtems/src/partdelete.c
index cc10abcded..032f73d3d0 100644
--- a/cpukit/rtems/src/partdelete.c
+++ b/cpukit/rtems/src/partdelete.c
@@ -29,13 +29,13 @@ rtems_status_code rtems_partition_delete(
    Partition_Control           *the_partition;
   Objects_Locations           location;
 
+  _Objects_Allocator_lock();
   the_partition = _Partition_Get( id, &location );
   switch ( location ) {
 
     case OBJECTS_LOCAL:
       if ( the_partition->number_of_used_blocks == 0 ) {
         _Objects_Close( &_Partition_Information, &the_partition->Object );
-        _Partition_Free( the_partition );
 #if defined(RTEMS_MULTIPROCESSING)
         if ( _Attributes_Is_global( the_partition->attribute_set ) ) {
 
@@ -54,14 +54,17 @@ rtems_status_code rtems_partition_delete(
 #endif
 
         _Objects_Put( &the_partition->Object );
+        _Partition_Free( the_partition );
+        _Objects_Allocator_unlock();
         return RTEMS_SUCCESSFUL;
       }
       _Objects_Put( &the_partition->Object );
+      _Objects_Allocator_unlock();
       return RTEMS_RESOURCE_IN_USE;
 
 #if defined(RTEMS_MULTIPROCESSING)
     case OBJECTS_REMOTE:
-      _Thread_Dispatch();
+      _Objects_Allocator_unlock();
       return RTEMS_ILLEGAL_ON_REMOTE_OBJECT;
 #endif
 
@@ -69,5 +72,7 @@ rtems_status_code rtems_partition_delete(
       break;
   }
 
+  _Objects_Allocator_unlock();
+
   return RTEMS_INVALID_ID;
 }
diff --git a/cpukit/rtems/src/ratemoncreate.c b/cpukit/rtems/src/ratemoncreate.c
index ce0e1de26b..1f597ec944 100644
--- a/cpukit/rtems/src/ratemoncreate.c
+++ b/cpukit/rtems/src/ratemoncreate.c
@@ -55,16 +55,14 @@ rtems_status_code rtems_rate_monotonic_create(
   if ( !id )
     return RTEMS_INVALID_ADDRESS;
 
-  _Thread_Disable_dispatch();            /* to prevent deletion */
-
   the_period = _Rate_monotonic_Allocate();
 
   if ( !the_period ) {
-    _Thread_Enable_dispatch();
+    _Objects_Allocator_unlock();
     return RTEMS_TOO_MANY;
   }
 
-  the_period->owner = _Thread_Executing;
+  the_period->owner = _Thread_Get_executing();
   the_period->state = RATE_MONOTONIC_INACTIVE;
 
   _Watchdog_Initialize( &the_period->Timer, NULL, 0, NULL );
@@ -78,6 +76,6 @@ rtems_status_code rtems_rate_monotonic_create(
   );
 
   *id = the_period->Object.id;
-  _Thread_Enable_dispatch();
+  _Objects_Allocator_unlock();
   return RTEMS_SUCCESSFUL;
 }
diff --git a/cpukit/rtems/src/ratemondelete.c b/cpukit/rtems/src/ratemondelete.c
index 0a9e6a49e2..36480beab1 100644
--- a/cpukit/rtems/src/ratemondelete.c
+++ b/cpukit/rtems/src/ratemondelete.c
@@ -30,6 +30,7 @@ rtems_status_code rtems_rate_monotonic_delete(
   Rate_monotonic_Control *the_period;
   Objects_Locations       location;
 
+  _Objects_Allocator_lock();
   the_period = _Rate_monotonic_Get( id, &location );
   switch ( location ) {
 
@@ -38,8 +39,9 @@ rtems_status_code rtems_rate_monotonic_delete(
       _Objects_Close( &_Rate_monotonic_Information, &the_period->Object );
       (void) _Watchdog_Remove( &the_period->Timer );
       the_period->state = RATE_MONOTONIC_INACTIVE;
-      _Rate_monotonic_Free( the_period );
       _Objects_Put( &the_period->Object );
+      _Rate_monotonic_Free( the_period );
+      _Objects_Allocator_unlock();
       return RTEMS_SUCCESSFUL;
 
 #if defined(RTEMS_MULTIPROCESSING)
@@ -49,5 +51,7 @@ rtems_status_code rtems_rate_monotonic_delete(
       break;
   }
 
+  _Objects_Allocator_unlock();
+
   return RTEMS_INVALID_ID;
 }
diff --git a/cpukit/rtems/src/regioncreate.c b/cpukit/rtems/src/regioncreate.c
index 3b4325e436..6c623c8250 100644
--- a/cpukit/rtems/src/regioncreate.c
+++ b/cpukit/rtems/src/regioncreate.c
@@ -66,9 +66,7 @@ rtems_status_code rtems_region_create(
   if ( !id )
     return RTEMS_INVALID_ADDRESS;
 
-  _RTEMS_Lock_allocator();                      /* to prevent deletion */
-
-    the_region = _Region_Allocate();
+  the_region = _Region_Allocate();
 
     if ( !the_region )
       return_status = RTEMS_TOO_MANY;
@@ -111,6 +109,7 @@ rtems_status_code rtems_region_create(
       }
     }
 
-  _RTEMS_Unlock_allocator();
+  _Objects_Allocator_unlock();
+
   return return_status;
 }
diff --git a/cpukit/rtems/src/regiondelete.c b/cpukit/rtems/src/regiondelete.c
index 5144db0464..5a2df7c009 100644
--- a/cpukit/rtems/src/regiondelete.c
+++ b/cpukit/rtems/src/regiondelete.c
@@ -34,7 +34,7 @@ rtems_status_code rtems_region_delete(
   rtems_status_code   return_status;
   Region_Control     *the_region;
 
-  _RTEMS_Lock_allocator();
+  _Objects_Allocator_lock();
 
     the_region = _Region_Get( id, &location );
     switch ( location ) {
@@ -61,6 +61,7 @@ rtems_status_code rtems_region_delete(
         break;
     }
 
-  _RTEMS_Unlock_allocator();
+  _Objects_Allocator_unlock();
+
   return return_status;
 }
diff --git a/cpukit/rtems/src/regionextend.c b/cpukit/rtems/src/regionextend.c
index 289377db91..65b68cdf1a 100644
--- a/cpukit/rtems/src/regionextend.c
+++ b/cpukit/rtems/src/regionextend.c
@@ -40,7 +40,7 @@ rtems_status_code rtems_region_extend(
   if ( !starting_address )
     return RTEMS_INVALID_ADDRESS;
 
-  _RTEMS_Lock_allocator();                      /* to prevent deletion */
+  _RTEMS_Lock_allocator(); /* to prevent deletion */
 
     the_region = _Region_Get( id, &location );
     switch ( location ) {
@@ -75,5 +75,6 @@ rtems_status_code rtems_region_extend(
     }
 
   _RTEMS_Unlock_allocator();
+
   return return_status;
 }
diff --git a/cpukit/rtems/src/regiongetsegment.c b/cpukit/rtems/src/regiongetsegment.c
index 92b3a94b6d..4bd244551a 100644
--- a/cpukit/rtems/src/regiongetsegment.c
+++ b/cpukit/rtems/src/regiongetsegment.c
@@ -47,7 +47,7 @@ rtems_status_code rtems_region_get_segment(
 
   _RTEMS_Lock_allocator();
 
-    executing  = _Thread_Executing;
+    executing  = _Thread_Get_executing();
     the_region = _Region_Get( id, &location );
     switch ( location ) {
 
@@ -110,5 +110,6 @@ rtems_status_code rtems_region_get_segment(
     }
 
   _RTEMS_Unlock_allocator();
+
   return return_status;
 }
diff --git a/cpukit/rtems/src/regionresizesegment.c b/cpukit/rtems/src/regionresizesegment.c
index ff45215118..ee3499a729 100644
--- a/cpukit/rtems/src/regionresizesegment.c
+++ b/cpukit/rtems/src/regionresizesegment.c
@@ -64,7 +64,8 @@ rtems_status_code rtems_region_resize_segment(
         _Region_Debug_Walk( the_region, 8 );
 
         if ( status == HEAP_RESIZE_SUCCESSFUL )
-          _Region_Process_queue( the_region );    /* unlocks allocator */
+          /* unlocks allocator */
+          _Region_Process_queue( the_region );
         else
           _RTEMS_Unlock_allocator();
 
diff --git a/cpukit/rtems/src/semcreate.c b/cpukit/rtems/src/semcreate.c
index bf9229e2ee..5cd9568a46 100644
--- a/cpukit/rtems/src/semcreate.c
+++ b/cpukit/rtems/src/semcreate.c
@@ -100,12 +100,10 @@ rtems_status_code rtems_semaphore_create(
   if ( !_Attributes_Is_counting_semaphore( attribute_set ) && ( count > 1 ) )
     return RTEMS_INVALID_NUMBER;
 
-  _Thread_Disable_dispatch();             /* prevents deletion */
-
   the_semaphore = _Semaphore_Allocate();
 
   if ( !the_semaphore ) {
-    _Thread_Enable_dispatch();
+    _Objects_Allocator_unlock();
     return RTEMS_TOO_MANY;
   }
 
@@ -114,7 +112,7 @@ rtems_status_code rtems_semaphore_create(
        ! ( _Objects_MP_Allocate_and_open( &_Semaphore_Information, name,
                             the_semaphore->Object.id, false ) ) ) {
     _Semaphore_Free( the_semaphore );
-    _Thread_Enable_dispatch();
+    _Objects_Allocator_unlock();
     return RTEMS_TOO_MANY;
   }
 #endif
@@ -179,14 +177,14 @@ rtems_status_code rtems_semaphore_create(
 
     mutex_status = _CORE_mutex_Initialize(
       &the_semaphore->Core_control.mutex,
-      _Thread_Executing,
+      _Thread_Get_executing(),
       &the_mutex_attr,
       (count == 1) ? CORE_MUTEX_UNLOCKED : CORE_MUTEX_LOCKED
     );
 
     if ( mutex_status == CORE_MUTEX_STATUS_CEILING_VIOLATED ) {
       _Semaphore_Free( the_semaphore );
-      _Thread_Enable_dispatch();
+      _Objects_Allocator_unlock();
       return RTEMS_INVALID_PRIORITY;
     }
   }
@@ -212,6 +210,6 @@ rtems_status_code rtems_semaphore_create(
       0                          /* Not used */
     );
 #endif
-  _Thread_Enable_dispatch();
+  _Objects_Allocator_unlock();
   return RTEMS_SUCCESSFUL;
 }
diff --git a/cpukit/rtems/src/semdelete.c b/cpukit/rtems/src/semdelete.c
index ea82b7757d..6e7c5eafad 100644
--- a/cpukit/rtems/src/semdelete.c
+++ b/cpukit/rtems/src/semdelete.c
@@ -44,6 +44,8 @@ rtems_status_code rtems_semaphore_delete(
   Semaphore_Control          *the_semaphore;
   Objects_Locations           location;
 
+  _Objects_Allocator_lock();
+
   the_semaphore = _Semaphore_Get( id, &location );
   switch ( location ) {
 
@@ -53,6 +55,7 @@ rtems_status_code rtems_semaphore_delete(
              !_Attributes_Is_simple_binary_semaphore(
                  the_semaphore->attribute_set ) ) {
           _Objects_Put( &the_semaphore->Object );
+          _Objects_Allocator_unlock();
           return RTEMS_RESOURCE_IN_USE;
         }
         _CORE_mutex_Flush(
@@ -70,8 +73,6 @@ rtems_status_code rtems_semaphore_delete(
 
       _Objects_Close( &_Semaphore_Information, &the_semaphore->Object );
 
-      _Semaphore_Free( the_semaphore );
-
 #if defined(RTEMS_MULTIPROCESSING)
       if ( _Attributes_Is_global( the_semaphore->attribute_set ) ) {
 
@@ -85,12 +86,15 @@ rtems_status_code rtems_semaphore_delete(
         );
       }
 #endif
+
       _Objects_Put( &the_semaphore->Object );
+      _Semaphore_Free( the_semaphore );
+      _Objects_Allocator_unlock();
       return RTEMS_SUCCESSFUL;
 
 #if defined(RTEMS_MULTIPROCESSING)
     case OBJECTS_REMOTE:
-      _Thread_Dispatch();
+      _Objects_Allocator_unlock();
       return RTEMS_ILLEGAL_ON_REMOTE_OBJECT;
 #endif
 
@@ -98,5 +102,6 @@ rtems_status_code rtems_semaphore_delete(
       break;
   }
 
+  _Objects_Allocator_unlock();
   return RTEMS_INVALID_ID;
 }
diff --git a/cpukit/rtems/src/taskcreate.c b/cpukit/rtems/src/taskcreate.c
index ae4e1883e4..35dd37c4e5 100644
--- a/cpukit/rtems/src/taskcreate.c
+++ b/cpukit/rtems/src/taskcreate.c
@@ -105,11 +105,6 @@ rtems_status_code rtems_task_create(
    */
 
   /*
-   *  Lock the allocator mutex for protection
-   */
-  _RTEMS_Lock_allocator();
-
-  /*
    *  Allocate the thread control block and -- if the task is global --
    *  allocate a global object control block.
    *
@@ -122,7 +117,7 @@ rtems_status_code rtems_task_create(
   the_thread = _RTEMS_tasks_Allocate();
 
   if ( !the_thread ) {
-    _RTEMS_Unlock_allocator();
+    _Objects_Allocator_unlock();
     return RTEMS_TOO_MANY;
   }
 
@@ -132,7 +127,7 @@ rtems_status_code rtems_task_create(
 
     if ( _Objects_MP_Is_null_global_object( the_global_object ) ) {
       _RTEMS_tasks_Free( the_thread );
-      _RTEMS_Unlock_allocator();
+      _Objects_Allocator_unlock();
       return RTEMS_TOO_MANY;
     }
   }
@@ -164,7 +159,7 @@ rtems_status_code rtems_task_create(
       _Objects_MP_Free_global_object( the_global_object );
 #endif
     _RTEMS_tasks_Free( the_thread );
-    _RTEMS_Unlock_allocator();
+    _Objects_Allocator_unlock();
     return RTEMS_UNSATISFIED;
   }
 
@@ -195,6 +190,6 @@ rtems_status_code rtems_task_create(
    }
 #endif
 
-  _RTEMS_Unlock_allocator();
+  _Objects_Allocator_unlock();
   return RTEMS_SUCCESSFUL;
 }
diff --git a/cpukit/rtems/src/timercreate.c b/cpukit/rtems/src/timercreate.c
index 35cdfab7fa..0b1c44bdc2 100644
--- a/cpukit/rtems/src/timercreate.c
+++ b/cpukit/rtems/src/timercreate.c
@@ -38,12 +38,10 @@ rtems_status_code rtems_timer_create(
   if ( !id )
     return RTEMS_INVALID_ADDRESS;
 
-  _Thread_Disable_dispatch();         /* to prevent deletion */
-
   the_timer = _Timer_Allocate();
 
   if ( !the_timer ) {
-    _Thread_Enable_dispatch();
+    _Objects_Allocator_unlock();
     return RTEMS_TOO_MANY;
   }
 
@@ -57,6 +55,6 @@ rtems_status_code rtems_timer_create(
   );
 
   *id = the_timer->Object.id;
-  _Thread_Enable_dispatch();
+  _Objects_Allocator_unlock();
   return RTEMS_SUCCESSFUL;
 }
diff --git a/cpukit/rtems/src/timerdelete.c b/cpukit/rtems/src/timerdelete.c
index a3cf52a978..19232c8096 100644
--- a/cpukit/rtems/src/timerdelete.c
+++ b/cpukit/rtems/src/timerdelete.c
@@ -32,14 +32,16 @@ rtems_status_code rtems_timer_delete(
   Timer_Control     *the_timer;
   Objects_Locations  location;
 
+  _Objects_Allocator_lock();
   the_timer = _Timer_Get( id, &location );
   switch ( location ) {
 
     case OBJECTS_LOCAL:
       _Objects_Close( &_Timer_Information, &the_timer->Object );
       (void) _Watchdog_Remove( &the_timer->Ticker );
-      _Timer_Free( the_timer );
       _Objects_Put( &the_timer->Object );
+      _Timer_Free( the_timer );
+      _Objects_Allocator_unlock();
       return RTEMS_SUCCESSFUL;
 
 #if defined(RTEMS_MULTIPROCESSING)
@@ -49,5 +51,7 @@ rtems_status_code rtems_timer_delete(
       break;
   }
 
+  _Objects_Allocator_unlock();
+
   return RTEMS_INVALID_ID;
 }
diff --git a/cpukit/sapi/src/extensioncreate.c b/cpukit/sapi/src/extensioncreate.c
index 1d7232f8c2..8442096527 100644
--- a/cpukit/sapi/src/extensioncreate.c
+++ b/cpukit/sapi/src/extensioncreate.c
@@ -39,16 +39,16 @@ rtems_status_code rtems_extension_create(
   if ( !rtems_is_name_valid( name ) )
     return RTEMS_INVALID_NAME;
 
-  _Thread_Disable_dispatch();         /* to prevent deletion */
-
   the_extension = _Extension_Allocate();
 
   if ( !the_extension ) {
-    _Thread_Enable_dispatch();
+    _Objects_Allocator_unlock();
     return RTEMS_TOO_MANY;
   }
 
+  _Thread_Disable_dispatch();
   _User_extensions_Add_set_with_table( &the_extension->Extension, extension_table );
+  _Thread_Enable_dispatch();
 
   _Objects_Open(
     &_Extension_Information,
@@ -57,6 +57,6 @@ rtems_status_code rtems_extension_create(
   );
 
   *id = the_extension->Object.id;
-  _Thread_Enable_dispatch();
+  _Objects_Allocator_unlock();
   return RTEMS_SUCCESSFUL;
 }
diff --git a/cpukit/sapi/src/extensiondelete.c b/cpukit/sapi/src/extensiondelete.c
index 0eaaffd103..f851ea06c2 100644
--- a/cpukit/sapi/src/extensiondelete.c
+++ b/cpukit/sapi/src/extensiondelete.c
@@ -30,13 +30,15 @@ rtems_status_code rtems_extension_delete(
   Extension_Control   *the_extension;
   Objects_Locations    location;
 
+  _Objects_Allocator_lock();
   the_extension = _Extension_Get( id, &location );
   switch ( location ) {
     case OBJECTS_LOCAL:
       _User_extensions_Remove_set( &the_extension->Extension );
       _Objects_Close( &_Extension_Information, &the_extension->Object );
-      _Extension_Free( the_extension );
       _Objects_Put( &the_extension->Object );
+      _Extension_Free( the_extension );
+      _Objects_Allocator_unlock();
       return RTEMS_SUCCESSFUL;
 
 #if defined(RTEMS_MULTIPROCESSING)
@@ -46,5 +48,7 @@ rtems_status_code rtems_extension_delete(
       break;
   }
 
+  _Objects_Allocator_unlock();
+
   return RTEMS_INVALID_ID;
 }
diff --git a/cpukit/score/include/rtems/score/objectimpl.h b/cpukit/score/include/rtems/score/objectimpl.h
index 119f11d829..383f0a738b 100644
--- a/cpukit/score/include/rtems/score/objectimpl.h
+++ b/cpukit/score/include/rtems/score/objectimpl.h
@@ -20,6 +20,7 @@
 #define _RTEMS_SCORE_OBJECTIMPL_H
 
 #include <rtems/score/object.h>
+#include <rtems/score/apimutex.h>
 #include <rtems/score/isrlevel.h>
 #include <rtems/score/threaddispatch.h>
 
@@ -264,25 +265,120 @@ unsigned int _Objects_API_maximum_class(
 );
 
 /**
- *  @brief Allocate an object.
+ * @brief Allocates an object without locking the allocator mutex.
  *
- *  This function allocates an object control block from
- *  the inactive chain of free object control blocks.
+ * This function can be called in two contexts
+ * - the executing thread is the owner of the object allocator mutex, or
+ * - in case the system state is not up, e.g. during sequential system
+ *   initialization.
  *
- *  @param[in] information points to an object class information block.
+ * @param[in] information The object information block.
+ *
+ * @retval NULL No object available.
+ * @retval object The allocated object.
+ *
+ * @see _Objects_Allocate() and _Objects_Free().
  */
-Objects_Control *_Objects_Allocate(
+Objects_Control *_Objects_Allocate_unprotected(
   Objects_Information *information
 );
 
 /**
- *  @brief Free an object.
+ * @brief Allocates an object.
  *
- *  This function frees an object control block to the
- *  inactive chain of free object control blocks.
+ * This function locks the object allocator mutex via
+ * _Objects_Allocator_lock().  The caller must later unlock the object
+ * allocator mutex via _Objects_Allocator_unlock().  The caller must unlock the
+ * mutex in any case, even if the allocation failed due to resource shortage.
  *
- *  @param[in] information points to an object class information block.
- *  @param[in] the_object points to the object to deallocate.
+ * A typical object allocation code looks like this:
+ * @code
+ * rtems_status_code some_create( rtems_id *id )
+ * {
+ *   rtems_status_code  sc;
+ *   Some_Control      *some;
+ *
+ *   // The object allocator mutex protects the executing thread from
+ *   // asynchronous thread restart and deletion.
+ *   some = (Some_Control *) _Objects_Allocate( &_Some_Information );
+ *
+ *   if ( some != NULL ) {
+ *     _Some_Initialize( some );
+ *     sc = RTEMS_SUCCESSFUL;
+ *   } else {
+ *     sc = RTEMS_TOO_MANY;
+ *   }
+ *
+ *   _Objects_Allocator_unlock();
+ *
+ *   return sc;
+ * }
+ * @endcode
+ *
+ * @param[in] information The object information block.
+ *
+ * @retval NULL No object available.
+ * @retval object The allocated object.
+ *
+ * @see _Objects_Free().
+ */
+Objects_Control *_Objects_Allocate( Objects_Information *information );
+
+/**
+ * @brief Frees an object.
+ *
+ * Appends the object to the chain of inactive objects.
+ *
+ * @param[in] information The object information block.
+ * @param[in] the_object The object to free.
+ *
+ * @see _Objects_Allocate().
+ *
+ * A typical object deletion code looks like this:
+ * @code
+ * rtems_status_code some_delete( rtems_id id )
+ * {
+ *   rtems_status_code  sc;
+ *   Some_Control      *some;
+ *   Objects_Locations  location;
+ *
+ *   // The object allocator mutex protects the executing thread from
+ *   // asynchronous thread restart and deletion.
+ *   _Objects_Allocator_lock();
+ *
+ *   // This will disable thread dispatching, so this starts a thread dispatch
+ *   // critical section.
+ *   some = (Semaphore_Control *)
+ *     _Objects_Get( &_Some_Information, id, &location );
+ *
+ *   switch ( location ) {
+ *     case OBJECTS_LOCAL:
+ *       // After the object close an object get with this identifier will
+ *       // fail.
+ *       _Objects_Close( &_Some_Information, &some->Object );
+ *
+ *       _Some_Delete( some );
+ *
+ *       // This enables thread dispatching, so the thread dispatch critical
+ *       // section ends here.
+ *       _Objects_Put( &some->Object );
+ *
+ *       // Thread dispatching is enabled.  The object free is only protected
+ *       // by the object allocator mutex.
+ *       _Objects_Free( &_Some_Information, &some->Object );
+ *
+ *       sc = RTEMS_SUCCESSFUL;
+ *       break;
+ *     default:
+ *       sc = RTEMS_INVALID_ID;
+ *       break;
+ *   }
+ *
+ *   _Objects_Allocator_unlock();
+ *
+ *   return sc;
+ * }
+ * @endcode
  */
 void _Objects_Free(
   Objects_Information *information,
@@ -892,6 +988,37 @@ RTEMS_INLINE_ROUTINE void _Objects_Put_for_get_isr_disable(
 #endif
 }
 
+/**
+ * @brief Locks the object allocator mutex.
+ *
+ * While holding the allocator mutex the executing thread is protected from
+ * asynchronous thread restart and deletion.
+ *
+ * The usage of the object allocator mutex with the thread life protection
+ * makes it possible to allocate and free objects without thread dispatching
+ * disabled.  The usage of a unified workspace and unlimited objects may lead
+ * to heap fragmentation.  Thus the execution time of the _Objects_Allocate()
+ * function may increase during system run-time.
+ *
+ * @see _Objects_Allocator_unlock() and _Objects_Allocate().
+ */
+RTEMS_INLINE_ROUTINE void _Objects_Allocator_lock( void )
+{
+  _RTEMS_Lock_allocator();
+}
+
+/**
+ * @brief Unlocks the object allocator mutex.
+ *
+ * In case the mutex is fully unlocked, then this function restores the
+ * previous thread life protection state and thus may not return if the
+ * executing thread was restarted or deleted in the mean-time.
+ */
+RTEMS_INLINE_ROUTINE void _Objects_Allocator_unlock( void )
+{
+  _RTEMS_Unlock_allocator();
+}
+
 /** @} */
 
 #ifdef __cplusplus
diff --git a/cpukit/score/include/rtems/score/threadimpl.h b/cpukit/score/include/rtems/score/threadimpl.h
index d0c7933aa3..2ac8344577 100644
--- a/cpukit/score/include/rtems/score/threadimpl.h
+++ b/cpukit/score/include/rtems/score/threadimpl.h
@@ -590,13 +590,10 @@ RTEMS_INLINE_ROUTINE uint32_t _Thread_Get_maximum_internal_threads(void)
   return maximum_internal_threads;
 }
 
-/**
- * This routine allocates an internal thread.
- */
-
 RTEMS_INLINE_ROUTINE Thread_Control *_Thread_Internal_allocate( void )
 {
-  return (Thread_Control *) _Objects_Allocate( &_Thread_Internal_information );
+  return (Thread_Control *)
+    _Objects_Allocate_unprotected( &_Thread_Internal_information );
 }
 
 RTEMS_INLINE_ROUTINE void _Thread_Request_dispatch_if_executing(
diff --git a/cpukit/score/src/apimutex.c b/cpukit/score/src/apimutex.c
index 18ac2db864..7899934183 100644
--- a/cpukit/score/src/apimutex.c
+++ b/cpukit/score/src/apimutex.c
@@ -58,7 +58,8 @@ void _API_Mutex_Allocate(
     0
   };
 
-  mutex = (API_Mutex_Control *) _Objects_Allocate( &_API_Mutex_Information );
+  mutex = (API_Mutex_Control *)
+    _Objects_Allocate_unprotected( &_API_Mutex_Information );
 
   _CORE_mutex_Initialize( &mutex->Mutex, NULL, &attr, CORE_MUTEX_UNLOCKED );
 
diff --git a/cpukit/score/src/objectactivecount.c b/cpukit/score/src/objectactivecount.c
index de34212f29..de3243afcb 100644
--- a/cpukit/score/src/objectactivecount.c
+++ b/cpukit/score/src/objectactivecount.c
@@ -17,14 +17,20 @@
 #endif
 
 #include <rtems/score/objectimpl.h>
+#include <rtems/score/assert.h>
 #include <rtems/score/chainimpl.h>
 
 Objects_Maximum _Objects_Active_count(
   const Objects_Information *information
 )
 {
-  size_t inactive = _Chain_Node_count_unprotected( &information->Inactive );
-  size_t maximum  = information->maximum;
+  size_t inactive;
+  size_t maximum;
+
+  _Assert( _Debug_Is_owner_of_allocator() );
+
+  inactive = _Chain_Node_count_unprotected( &information->Inactive );
+  maximum  = information->maximum;
 
   return (Objects_Maximum) ( maximum - inactive );
 }
diff --git a/cpukit/score/src/objectallocate.c b/cpukit/score/src/objectallocate.c
index 842c49d77a..40a7cae82c 100644
--- a/cpukit/score/src/objectallocate.c
+++ b/cpukit/score/src/objectallocate.c
@@ -19,7 +19,9 @@
 #endif
 
 #include <rtems/score/objectimpl.h>
+#include <rtems/score/assert.h>
 #include <rtems/score/chainimpl.h>
+#include <rtems/score/sysstate.h>
 
 /* #define RTEMS_DEBUG_OBJECT_ALLOCATION */
 
@@ -27,12 +29,24 @@
 #include <rtems/bspIo.h>
 #endif
 
-Objects_Control *_Objects_Allocate(
+static Objects_Control *_Objects_Get_inactive(
+  Objects_Information *information
+)
+{
+  return (Objects_Control *) _Chain_Get_unprotected( &information->Inactive );
+}
+
+Objects_Control *_Objects_Allocate_unprotected(
   Objects_Information *information
 )
 {
   Objects_Control *the_object;
 
+  _Assert(
+    _Debug_Is_owner_of_allocator()
+      || !_System_state_Is_up( _System_state_Get() )
+  );
+
   /*
    *  If the application is using the optional manager stubs and
    *  still attempts to create the object, the information block
@@ -46,7 +60,7 @@ Objects_Control *_Objects_Allocate(
    *  OK.  The manager should be initialized and configured to have objects.
    *  With any luck, it is safe to attempt to allocate an object.
    */
-  the_object = (Objects_Control *) _Chain_Get( &information->Inactive );
+  the_object = _Objects_Get_inactive( information );
 
   if ( information->auto_extend ) {
     /*
@@ -56,7 +70,7 @@ Objects_Control *_Objects_Allocate(
 
     if ( !the_object ) {
       _Objects_Extend_information( information );
-      the_object =  (Objects_Control *) _Chain_Get( &information->Inactive );
+      the_object = _Objects_Get_inactive( information );
     }
 
     if ( the_object ) {
@@ -83,3 +97,10 @@ Objects_Control *_Objects_Allocate(
 
   return the_object;
 }
+
+Objects_Control *_Objects_Allocate( Objects_Information *information )
+{
+  _RTEMS_Lock_allocator();
+
+  return _Objects_Allocate_unprotected( information );
+}
diff --git a/cpukit/score/src/objectextendinformation.c b/cpukit/score/src/objectextendinformation.c
index d11f927588..b1fcec7617 100644
--- a/cpukit/score/src/objectextendinformation.c
+++ b/cpukit/score/src/objectextendinformation.c
@@ -20,8 +20,10 @@
 
 #include <rtems/score/objectimpl.h>
 #include <rtems/score/address.h>
+#include <rtems/score/assert.h>
 #include <rtems/score/chainimpl.h>
 #include <rtems/score/isrlevel.h>
+#include <rtems/score/sysstate.h>
 #include <rtems/score/wkspace.h>
 
 #include <string.h>  /* for memcpy() */
@@ -42,10 +44,10 @@ void _Objects_Extend_information(
 )
 {
   Objects_Control  *the_object;
-  Chain_Control     Inactive;
   uint32_t          block_count;
   uint32_t          block;
   uint32_t          index_base;
+  uint32_t          index_end;
   uint32_t          minimum_index;
   uint32_t          index;
   uint32_t          maximum;
@@ -53,6 +55,11 @@ void _Objects_Extend_information(
   void             *new_object_block;
   bool              do_extend;
 
+  _Assert(
+    _Debug_Is_owner_of_allocator()
+      || !_System_state_Is_up( _System_state_Get() )
+  );
+
   /*
    *  Search for a free block of indexes. If we do NOT need to allocate or
    *  extend the block table, then we will change do_extend.
@@ -76,6 +83,7 @@ void _Objects_Extend_information(
         index_base += information->allocation_size;
     }
   }
+  index_end = index_base + information->allocation_size;
 
   maximum = (uint32_t) information->maximum + information->allocation_size;
 
@@ -213,12 +221,11 @@ void _Objects_Extend_information(
     object_blocks[block_count] = NULL;
     inactive_per_block[block_count] = 0;
 
-    for ( index=index_base ;
-          index < ( information->allocation_size + index_base );
-          index++ ) {
+    for ( index = index_base ; index < index_end ; ++index ) {
       local_table[ index ] = NULL;
     }
 
+    _Thread_Disable_dispatch();
     _ISR_Disable( level );
 
     old_tables = information->object_blocks;
@@ -235,6 +242,7 @@ void _Objects_Extend_information(
       );
 
     _ISR_Enable( level );
+    _Thread_Enable_dispatch();
 
     _Workspace_Free( old_tables );
 
@@ -247,32 +255,21 @@ void _Objects_Extend_information(
   information->object_blocks[ block ] = new_object_block;
 
   /*
-   *  Initialize objects .. add to a local chain first.
+   *  Append to inactive chain.
    */
-  _Chain_Initialize(
-    &Inactive,
-    information->object_blocks[ block ],
-    information->allocation_size,
-    information->size
-  );
-
-  /*
-   *  Move from the local chain, initialise, then append to the inactive chain
-   */
-  index = index_base;
-
-  while ((the_object = (Objects_Control *) _Chain_Get( &Inactive )) != NULL ) {
-
+  the_object = information->object_blocks[ block ];
+  for ( index = index_base ; index < index_end ; ++index ) {
     the_object->id = _Objects_Build_id(
-        information->the_api,
-        information->the_class,
-        _Objects_Local_node,
-        index
-      );
+      information->the_api,
+      information->the_class,
+      _Objects_Local_node,
+      index
+    );
 
-    _Chain_Append( &information->Inactive, &the_object->Node );
+    _Chain_Append_unprotected( &information->Inactive, &the_object->Node );
 
-    index++;
+    the_object = (Objects_Control *)
+      ( (char *) the_object + information->size );
   }
 
   information->inactive_per_block[ block ] = information->allocation_size;
diff --git a/cpukit/score/src/objectfree.c b/cpukit/score/src/objectfree.c
index cc2fbac5a5..f1c0ee49b2 100644
--- a/cpukit/score/src/objectfree.c
+++ b/cpukit/score/src/objectfree.c
@@ -19,6 +19,7 @@
 #endif
 
 #include <rtems/score/objectimpl.h>
+#include <rtems/score/assert.h>
 #include <rtems/score/chainimpl.h>
 
 void _Objects_Free(
@@ -28,7 +29,9 @@ void _Objects_Free(
 {
   uint32_t    allocation_size = information->allocation_size;
 
-  _Chain_Append( &information->Inactive, &the_object->Node );
+  _Assert( _Debug_Is_owner_of_allocator() );
+
+  _Chain_Append_unprotected( &information->Inactive, &the_object->Node );
 
   if ( information->auto_extend ) {
     uint32_t    block;
diff --git a/cpukit/score/src/objectshrinkinformation.c b/cpukit/score/src/objectshrinkinformation.c
index 9731c2179d..2f64cd2502 100644
--- a/cpukit/score/src/objectshrinkinformation.c
+++ b/cpukit/score/src/objectshrinkinformation.c
@@ -19,6 +19,7 @@
 #endif
 
 #include <rtems/score/objectimpl.h>
+#include <rtems/score/assert.h>
 #include <rtems/score/chainimpl.h>
 #include <rtems/score/wkspace.h>
 
@@ -30,6 +31,8 @@ void _Objects_Shrink_information(
   uint32_t          block;
   uint32_t          index_base;
 
+  _Assert( _Debug_Is_owner_of_allocator() );
+
   /*
    * Search the list to find block or chunk with all objects inactive.
    */
@@ -55,7 +58,7 @@ void _Objects_Shrink_information(
         node = _Chain_Next( node );
 
         if ( index >= index_base && index < index_end ) {
-          _Chain_Extract( &object->Node );
+          _Chain_Extract_unprotected( &object->Node );
         }
       }
 
diff --git a/testsuites/sptests/spobjgetnext/init.c b/testsuites/sptests/spobjgetnext/init.c
index 9682c346fe..2695190239 100644
--- a/testsuites/sptests/spobjgetnext/init.c
+++ b/testsuites/sptests/spobjgetnext/init.c
@@ -108,7 +108,9 @@ rtems_task Init(
   /* XXX try with a manager with no objects created */
 
   puts( "Init - _Objects_Active_count" );
+  _Objects_Allocator_lock();
   active_count = _Objects_Active_count( info );
+  _Objects_Allocator_unlock();
   rtems_test_assert( active_count == 1 );
 
   TEST_END();