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authorJoel Sherrill <joel.sherrill@OARcorp.com>1999-11-02 21:48:15 +0000
committerJoel Sherrill <joel.sherrill@OARcorp.com>1999-11-02 21:48:15 +0000
commit7cc8d6c3b1a207684892d207055ceff9f37d5731 (patch)
tree3da2f9ee0425a6b49a32df5c8298789de0672add /c
parentSplit core message queue and watchdog handler objects into separate files. (diff)
downloadrtems-7cc8d6c3b1a207684892d207055ceff9f37d5731.tar.bz2
Split core mutex and semaphore handlers into separate files.
Diffstat (limited to 'c')
-rw-r--r--c/src/exec/score/src/coremutexflush.c52
-rw-r--r--c/src/exec/score/src/coremutexseize.c156
-rw-r--r--c/src/exec/score/src/coremutexsurrender.c139
-rw-r--r--c/src/exec/score/src/coresemflush.c58
-rw-r--r--c/src/exec/score/src/coresemseize.c81
-rw-r--r--c/src/exec/score/src/coresemsurrender.c75
6 files changed, 561 insertions, 0 deletions
diff --git a/c/src/exec/score/src/coremutexflush.c b/c/src/exec/score/src/coremutexflush.c
new file mode 100644
index 0000000000..27ba369acf
--- /dev/null
+++ b/c/src/exec/score/src/coremutexflush.c
@@ -0,0 +1,52 @@
+/*
+ * Mutex Handler
+ *
+ * DESCRIPTION:
+ *
+ * This package is the implementation of the Mutex Handler.
+ * This handler provides synchronization and mutual exclusion capabilities.
+ *
+ * COPYRIGHT (c) 1989-1998.
+ * On-Line Applications Research Corporation (OAR).
+ * Copyright assigned to U.S. Government, 1994.
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.OARcorp.com/rtems/license.html.
+ *
+ * $Id$
+ */
+
+#include <rtems/system.h>
+#include <rtems/score/isr.h>
+#include <rtems/score/coremutex.h>
+#include <rtems/score/states.h>
+#include <rtems/score/thread.h>
+#include <rtems/score/threadq.h>
+
+/*PAGE
+ *
+ * _CORE_mutex_Flush
+ *
+ * This function a flushes the mutex's task wait queue.
+ *
+ * Input parameters:
+ * the_mutex - the mutex to be flushed
+ * remote_extract_callout - function to invoke remotely
+ * status - status to pass to thread
+ *
+ * Output parameters: NONE
+ */
+
+void _CORE_mutex_Flush(
+ CORE_mutex_Control *the_mutex,
+ Thread_queue_Flush_callout remote_extract_callout,
+ unsigned32 status
+)
+{
+ _Thread_queue_Flush(
+ &the_mutex->Wait_queue,
+ remote_extract_callout,
+ status
+ );
+}
diff --git a/c/src/exec/score/src/coremutexseize.c b/c/src/exec/score/src/coremutexseize.c
new file mode 100644
index 0000000000..a2c8a37d71
--- /dev/null
+++ b/c/src/exec/score/src/coremutexseize.c
@@ -0,0 +1,156 @@
+/*
+ * Mutex Handler
+ *
+ * DESCRIPTION:
+ *
+ * This package is the implementation of the Mutex Handler.
+ * This handler provides synchronization and mutual exclusion capabilities.
+ *
+ * COPYRIGHT (c) 1989-1998.
+ * On-Line Applications Research Corporation (OAR).
+ * Copyright assigned to U.S. Government, 1994.
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.OARcorp.com/rtems/license.html.
+ *
+ * $Id$
+ */
+
+#include <rtems/system.h>
+#include <rtems/score/isr.h>
+#include <rtems/score/coremutex.h>
+#include <rtems/score/states.h>
+#include <rtems/score/thread.h>
+#include <rtems/score/threadq.h>
+
+/*PAGE
+ *
+ * _CORE_mutex_Seize
+ *
+ * This routine attempts to allocate a mutex to the calling thread.
+ *
+ * Input parameters:
+ * the_mutex - pointer to mutex control block
+ * id - id of object to wait on
+ * wait - TRUE if wait is allowed, FALSE otherwise
+ * timeout - number of ticks to wait (0 means forever)
+ *
+ * Output parameters: NONE
+ *
+ * INTERRUPT LATENCY:
+ * available
+ * wait
+ */
+
+void _CORE_mutex_Seize(
+ CORE_mutex_Control *the_mutex,
+ Objects_Id id,
+ boolean wait,
+ Watchdog_Interval timeout
+)
+{
+ Thread_Control *executing;
+ ISR_Level level;
+
+ executing = _Thread_Executing;
+ switch ( the_mutex->Attributes.discipline ) {
+ case CORE_MUTEX_DISCIPLINES_FIFO:
+ case CORE_MUTEX_DISCIPLINES_PRIORITY:
+ case CORE_MUTEX_DISCIPLINES_PRIORITY_INHERIT:
+ break;
+ case CORE_MUTEX_DISCIPLINES_PRIORITY_CEILING:
+ if ( executing->current_priority <
+ the_mutex->Attributes.priority_ceiling) {
+ executing->Wait.return_code = CORE_MUTEX_STATUS_CEILING_VIOLATED;
+ return;
+ }
+ }
+ executing->Wait.return_code = CORE_MUTEX_STATUS_SUCCESSFUL;
+ _ISR_Disable( level );
+ if ( ! _CORE_mutex_Is_locked( the_mutex ) ) {
+ the_mutex->lock = CORE_MUTEX_LOCKED;
+ the_mutex->holder = executing;
+ the_mutex->holder_id = executing->Object.id;
+ the_mutex->nest_count = 1;
+ executing->resource_count++;
+ _ISR_Enable( level );
+ switch ( the_mutex->Attributes.discipline ) {
+ case CORE_MUTEX_DISCIPLINES_FIFO:
+ case CORE_MUTEX_DISCIPLINES_PRIORITY:
+ case CORE_MUTEX_DISCIPLINES_PRIORITY_INHERIT:
+ /* already the highest priority */
+ break;
+ case CORE_MUTEX_DISCIPLINES_PRIORITY_CEILING:
+ if ( the_mutex->Attributes.priority_ceiling <
+ executing->current_priority ) {
+ _Thread_Change_priority(
+ the_mutex->holder,
+ the_mutex->Attributes.priority_ceiling,
+ FALSE
+ );
+ }
+ }
+ return;
+ }
+
+ if ( _Objects_Are_ids_equal(
+ _Thread_Executing->Object.id, the_mutex->holder_id ) ) {
+ if ( _CORE_mutex_Is_nesting_allowed( &the_mutex->Attributes ) )
+ the_mutex->nest_count++;
+ else
+ executing->Wait.return_code = CORE_MUTEX_STATUS_NESTING_NOT_ALLOWED;
+
+ _ISR_Enable( level );
+ return;
+ }
+
+ if ( !wait ) {
+ _ISR_Enable( level );
+ executing->Wait.return_code = CORE_MUTEX_STATUS_UNSATISFIED_NOWAIT;
+ return;
+ }
+
+ _Thread_queue_Enter_critical_section( &the_mutex->Wait_queue );
+ executing->Wait.queue = &the_mutex->Wait_queue;
+ executing->Wait.id = id;
+ _ISR_Enable( level );
+
+ switch ( the_mutex->Attributes.discipline ) {
+ case CORE_MUTEX_DISCIPLINES_FIFO:
+ case CORE_MUTEX_DISCIPLINES_PRIORITY:
+ case CORE_MUTEX_DISCIPLINES_PRIORITY_CEILING:
+ break;
+ case CORE_MUTEX_DISCIPLINES_PRIORITY_INHERIT:
+ if ( the_mutex->holder->current_priority > executing->current_priority ) {
+ _Thread_Change_priority(
+ the_mutex->holder,
+ executing->current_priority,
+ FALSE
+ );
+ }
+ break;
+ }
+
+ _Thread_queue_Enqueue( &the_mutex->Wait_queue, timeout );
+
+ if ( _Thread_Executing->Wait.return_code == CORE_MUTEX_STATUS_SUCCESSFUL ) {
+ switch ( the_mutex->Attributes.discipline ) {
+ case CORE_MUTEX_DISCIPLINES_FIFO:
+ case CORE_MUTEX_DISCIPLINES_PRIORITY:
+ case CORE_MUTEX_DISCIPLINES_PRIORITY_INHERIT:
+ break;
+ case CORE_MUTEX_DISCIPLINES_PRIORITY_CEILING:
+ if ( the_mutex->Attributes.priority_ceiling <
+ executing->current_priority ) {
+ _Thread_Change_priority(
+ executing,
+ the_mutex->Attributes.priority_ceiling,
+ FALSE
+ );
+ };
+ break;
+ }
+ }
+}
+
diff --git a/c/src/exec/score/src/coremutexsurrender.c b/c/src/exec/score/src/coremutexsurrender.c
new file mode 100644
index 0000000000..b7f38eb2b0
--- /dev/null
+++ b/c/src/exec/score/src/coremutexsurrender.c
@@ -0,0 +1,139 @@
+/*
+ * Mutex Handler
+ *
+ * DESCRIPTION:
+ *
+ * This package is the implementation of the Mutex Handler.
+ * This handler provides synchronization and mutual exclusion capabilities.
+ *
+ * COPYRIGHT (c) 1989-1998.
+ * On-Line Applications Research Corporation (OAR).
+ * Copyright assigned to U.S. Government, 1994.
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.OARcorp.com/rtems/license.html.
+ *
+ * $Id$
+ */
+
+#include <rtems/system.h>
+#include <rtems/score/isr.h>
+#include <rtems/score/coremutex.h>
+#include <rtems/score/states.h>
+#include <rtems/score/thread.h>
+#include <rtems/score/threadq.h>
+
+/*
+ * _CORE_mutex_Surrender
+ *
+ * DESCRIPTION:
+ *
+ * This routine frees a unit to the mutex. If a task was blocked waiting for
+ * a unit from this mutex, then that task will be readied and the unit
+ * given to that task. Otherwise, the unit will be returned to the mutex.
+ *
+ * Input parameters:
+ * the_mutex - the mutex to be flushed
+ * id - id of parent mutex
+ * api_mutex_mp_support - api dependent MP support actions
+ *
+ * Output parameters:
+ * CORE_MUTEX_STATUS_SUCCESSFUL - if successful
+ * core error code - if unsuccessful
+ */
+
+CORE_mutex_Status _CORE_mutex_Surrender(
+ CORE_mutex_Control *the_mutex,
+ Objects_Id id,
+ CORE_mutex_API_mp_support_callout api_mutex_mp_support
+)
+{
+ Thread_Control *the_thread;
+ Thread_Control *executing;
+
+ executing = _Thread_Executing;
+
+ /*
+ * The following code allows a thread (or ISR) other than the thread
+ * which acquired the mutex to release that mutex. This is only
+ * allowed when the mutex in quetion is FIFO or simple Priority
+ * discipline. But Priority Ceiling or Priority Inheritance mutexes
+ * must be released by the thread which acquired them.
+ */
+
+ if ( !_Objects_Are_ids_equal(
+ _Thread_Executing->Object.id, the_mutex->holder_id ) ) {
+
+ switch ( the_mutex->Attributes.discipline ) {
+ case CORE_MUTEX_DISCIPLINES_FIFO:
+ case CORE_MUTEX_DISCIPLINES_PRIORITY:
+ break;
+ case CORE_MUTEX_DISCIPLINES_PRIORITY_CEILING:
+ case CORE_MUTEX_DISCIPLINES_PRIORITY_INHERIT:
+ return( CORE_MUTEX_STATUS_NOT_OWNER_OF_RESOURCE );
+ break;
+ }
+ }
+
+ the_mutex->nest_count--;
+
+ if ( the_mutex->nest_count != 0 )
+ return( CORE_MUTEX_STATUS_SUCCESSFUL );
+
+ _Thread_Executing->resource_count--;
+ the_mutex->holder = NULL;
+ the_mutex->holder_id = 0;
+
+ /*
+ * Whether or not someone is waiting for the mutex, an
+ * inherited priority must be lowered if this is the last
+ * mutex (i.e. resource) this task has.
+ */
+
+ switch ( the_mutex->Attributes.discipline ) {
+ case CORE_MUTEX_DISCIPLINES_FIFO:
+ case CORE_MUTEX_DISCIPLINES_PRIORITY:
+ break;
+ case CORE_MUTEX_DISCIPLINES_PRIORITY_CEILING:
+ case CORE_MUTEX_DISCIPLINES_PRIORITY_INHERIT:
+ if ( executing->resource_count == 0 &&
+ executing->real_priority != executing->current_priority ) {
+ _Thread_Change_priority( executing, executing->real_priority, TRUE );
+ }
+ break;
+ }
+
+
+ if ( ( the_thread = _Thread_queue_Dequeue( &the_mutex->Wait_queue ) ) ) {
+
+#if defined(RTEMS_MULTIPROCESSING)
+ if ( !_Objects_Is_local_id( the_thread->Object.id ) ) {
+
+ the_mutex->holder = NULL;
+ the_mutex->holder_id = the_thread->Object.id;
+ the_mutex->nest_count = 1;
+
+ ( *api_mutex_mp_support)( the_thread, id );
+
+ } else
+#endif
+ {
+
+ the_mutex->holder = the_thread;
+ the_mutex->holder_id = the_thread->Object.id;
+ the_thread->resource_count++;
+ the_mutex->nest_count = 1;
+
+ /*
+ * No special action for priority inheritance or priority ceiling
+ * because the_thread is guaranteed to be the highest priority
+ * thread waiting for the mutex.
+ */
+ }
+ } else
+ the_mutex->lock = CORE_MUTEX_UNLOCKED;
+
+ return( CORE_MUTEX_STATUS_SUCCESSFUL );
+}
+
diff --git a/c/src/exec/score/src/coresemflush.c b/c/src/exec/score/src/coresemflush.c
new file mode 100644
index 0000000000..c456b661e5
--- /dev/null
+++ b/c/src/exec/score/src/coresemflush.c
@@ -0,0 +1,58 @@
+/*
+ * CORE Semaphore Handler
+ *
+ * DESCRIPTION:
+ *
+ * This package is the implementation of the CORE Semaphore Handler.
+ * This core object utilizes standard Dijkstra counting semaphores to provide
+ * synchronization and mutual exclusion capabilities.
+ *
+ * COPYRIGHT (c) 1989-1998.
+ * On-Line Applications Research Corporation (OAR).
+ * Copyright assigned to U.S. Government, 1994.
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.OARcorp.com/rtems/license.html.
+ *
+ * $Id$
+ */
+
+#include <rtems/system.h>
+#include <rtems/score/isr.h>
+#include <rtems/score/coresem.h>
+#include <rtems/score/states.h>
+#include <rtems/score/thread.h>
+#include <rtems/score/threadq.h>
+#if defined(RTEMS_MULTIPROCESSING)
+#include <rtems/score/mpci.h>
+#endif
+
+/*PAGE
+ *
+ * _CORE_semaphore_Flush
+ *
+ * This function a flushes the semaphore's task wait queue.
+ *
+ * Input parameters:
+ * the_semaphore - the semaphore to be flushed
+ * remote_extract_callout - function to invoke remotely
+ * status - status to pass to thread
+ *
+ * Output parameters: NONE
+ */
+
+void _CORE_semaphore_Flush(
+ CORE_semaphore_Control *the_semaphore,
+ Thread_queue_Flush_callout remote_extract_callout,
+ unsigned32 status
+)
+{
+
+ _Thread_queue_Flush(
+ &the_semaphore->Wait_queue,
+ remote_extract_callout,
+ status
+ );
+
+}
diff --git a/c/src/exec/score/src/coresemseize.c b/c/src/exec/score/src/coresemseize.c
new file mode 100644
index 0000000000..f08b40ca5b
--- /dev/null
+++ b/c/src/exec/score/src/coresemseize.c
@@ -0,0 +1,81 @@
+/*
+ * CORE Semaphore Handler
+ *
+ * DESCRIPTION:
+ *
+ * This package is the implementation of the CORE Semaphore Handler.
+ * This core object utilizes standard Dijkstra counting semaphores to provide
+ * synchronization and mutual exclusion capabilities.
+ *
+ * COPYRIGHT (c) 1989-1998.
+ * On-Line Applications Research Corporation (OAR).
+ * Copyright assigned to U.S. Government, 1994.
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.OARcorp.com/rtems/license.html.
+ *
+ * $Id$
+ */
+
+#include <rtems/system.h>
+#include <rtems/score/isr.h>
+#include <rtems/score/coresem.h>
+#include <rtems/score/states.h>
+#include <rtems/score/thread.h>
+#include <rtems/score/threadq.h>
+#if defined(RTEMS_MULTIPROCESSING)
+#include <rtems/score/mpci.h>
+#endif
+
+/*PAGE
+ *
+ * _CORE_semaphore_Seize
+ *
+ * This routine attempts to allocate a core semaphore to the calling thread.
+ *
+ * Input parameters:
+ * the_semaphore - pointer to semaphore control block
+ * id - id of object to wait on
+ * wait - TRUE if wait is allowed, FALSE otherwise
+ * timeout - number of ticks to wait (0 means forever)
+ *
+ * Output parameters: NONE
+ *
+ * INTERRUPT LATENCY:
+ * available
+ * wait
+ */
+
+void _CORE_semaphore_Seize(
+ CORE_semaphore_Control *the_semaphore,
+ Objects_Id id,
+ boolean wait,
+ Watchdog_Interval timeout
+)
+{
+ Thread_Control *executing;
+ ISR_Level level;
+
+ executing = _Thread_Executing;
+ executing->Wait.return_code = CORE_SEMAPHORE_STATUS_SUCCESSFUL;
+ _ISR_Disable( level );
+ if ( the_semaphore->count != 0 ) {
+ the_semaphore->count -= 1;
+ _ISR_Enable( level );
+ return;
+ }
+
+ if ( !wait ) {
+ _ISR_Enable( level );
+ executing->Wait.return_code = CORE_SEMAPHORE_STATUS_UNSATISFIED_NOWAIT;
+ return;
+ }
+
+ _Thread_queue_Enter_critical_section( &the_semaphore->Wait_queue );
+ executing->Wait.queue = &the_semaphore->Wait_queue;
+ executing->Wait.id = id;
+ _ISR_Enable( level );
+
+ _Thread_queue_Enqueue( &the_semaphore->Wait_queue, timeout );
+}
diff --git a/c/src/exec/score/src/coresemsurrender.c b/c/src/exec/score/src/coresemsurrender.c
new file mode 100644
index 0000000000..dd4839182c
--- /dev/null
+++ b/c/src/exec/score/src/coresemsurrender.c
@@ -0,0 +1,75 @@
+/*
+ * CORE Semaphore Handler
+ *
+ * DESCRIPTION:
+ *
+ * This package is the implementation of the CORE Semaphore Handler.
+ * This core object utilizes standard Dijkstra counting semaphores to provide
+ * synchronization and mutual exclusion capabilities.
+ *
+ * COPYRIGHT (c) 1989-1998.
+ * On-Line Applications Research Corporation (OAR).
+ * Copyright assigned to U.S. Government, 1994.
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.OARcorp.com/rtems/license.html.
+ *
+ * $Id$
+ */
+
+#include <rtems/system.h>
+#include <rtems/score/isr.h>
+#include <rtems/score/coresem.h>
+#include <rtems/score/states.h>
+#include <rtems/score/thread.h>
+#include <rtems/score/threadq.h>
+#if defined(RTEMS_MULTIPROCESSING)
+#include <rtems/score/mpci.h>
+#endif
+
+/*PAGE
+ *
+ * _CORE_semaphore_Surrender
+ *
+ * Input parameters:
+ * the_semaphore - the semaphore to be flushed
+ * id - id of parent semaphore
+ * api_semaphore_mp_support - api dependent MP support actions
+ *
+ * Output parameters:
+ * CORE_SEMAPHORE_STATUS_SUCCESSFUL - if successful
+ * core error code - if unsuccessful
+ *
+ * Output parameters:
+ */
+
+CORE_semaphore_Status _CORE_semaphore_Surrender(
+ CORE_semaphore_Control *the_semaphore,
+ Objects_Id id,
+ CORE_semaphore_API_mp_support_callout api_semaphore_mp_support
+)
+{
+ Thread_Control *the_thread;
+ ISR_Level level;
+ CORE_semaphore_Status status;
+
+ status = CORE_SEMAPHORE_STATUS_SUCCESSFUL;
+
+ if ( (the_thread = _Thread_queue_Dequeue(&the_semaphore->Wait_queue)) ) {
+
+ if ( !_Objects_Is_local_id( the_thread->Object.id ) )
+ (*api_semaphore_mp_support) ( the_thread, id );
+
+ } else {
+ _ISR_Disable( level );
+ if ( the_semaphore->count <= the_semaphore->Attributes.maximum_count )
+ the_semaphore->count += 1;
+ else
+ status = CORE_SEMAPHORE_MAXIMUM_COUNT_EXCEEDED;
+ _ISR_Enable( level );
+ }
+
+ return status;
+}
+