score: Add Thread_queue_Control::Lock

Move the complete thread queue enqueue procedure into
_Thread_queue_Enqueue_critical().  It is possible to use the thread
queue lock to protect state of the object embedding the thread queue.
This enables per object fine grained locking in the future.

Delete _Thread_queue_Enter_critical_section().

Update #2273.

1 files changed, 15 insertions, 7 deletions

diff --git a/cpukit/score/src/threadqfirst.c b/cpukit/score/src/threadqfirst.c
index 5d97ae156d..f43b9abbd0 100644
--- a/cpukit/score/src/threadqfirst.c
+++ b/cpukit/score/src/threadqfirst.c
@@ -20,20 +20,16 @@
 
 #include <rtems/score/threadqimpl.h>
 #include <rtems/score/chainimpl.h>
-#include <rtems/score/isrlevel.h>
 #include <rtems/score/threadimpl.h>
 
-Thread_Control *_Thread_queue_First(
+Thread_Control *_Thread_queue_First_locked(
   Thread_queue_Control *the_thread_queue
 )
 {
-  ISR_Level       level;
   Thread_Control *thread;
 
   thread = NULL;
 
-  _ISR_Disable( level );
-
   if ( the_thread_queue->discipline == THREAD_QUEUE_DISCIPLINE_FIFO ) {
     if ( !_Chain_Is_empty( &the_thread_queue->Queues.Fifo ) )
       thread = (Thread_Control *) _Chain_First(&the_thread_queue->Queues.Fifo);
@@ -45,7 +41,19 @@ Thread_Control *_Thread_queue_First(
       thread = THREAD_RBTREE_NODE_TO_THREAD( first );
   }
 
-  _ISR_Enable( level );
-
   return thread;
 }
+
+Thread_Control *_Thread_queue_First(
+  Thread_queue_Control *the_thread_queue
+)
+{
+  Thread_Control   *the_thread;
+  ISR_lock_Context  lock_context;
+
+  _Thread_queue_Acquire( the_thread_queue, &lock_context );
+  the_thread = _Thread_queue_First_locked( the_thread_queue );
+  _Thread_queue_Release( the_thread_queue, &lock_context );
+
+  return the_thread;
+}