diff options
author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2015-07-13 13:49:35 +0200 |
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committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2015-07-23 08:01:14 +0200 |
commit | e709aa8522788a45adc0adf22daac82c574fcae4 (patch) | |
tree | 0d98e853cde5065aac1fe4eda5517ac22d8445f9 /cpukit/score/src | |
parent | score: Introduce Thread_queue_Heads (diff) | |
download | rtems-e709aa8522788a45adc0adf22daac82c574fcae4.tar.bz2 |
score: Move wait flag update to tq extract
This makes it possible to use _Thread_queue_Extract_locked() for barrier
operations which extract all threads on the queue in one critical
section.
Diffstat (limited to '')
-rw-r--r-- | cpukit/score/src/coremutexsurrender.c | 5 | ||||
-rw-r--r-- | cpukit/score/src/threadqenqueue.c | 31 |
2 files changed, 22 insertions, 14 deletions
diff --git a/cpukit/score/src/coremutexsurrender.c b/cpukit/score/src/coremutexsurrender.c index e3f0d6f2e4..d3f965d55d 100644 --- a/cpukit/score/src/coremutexsurrender.c +++ b/cpukit/score/src/coremutexsurrender.c @@ -179,13 +179,15 @@ CORE_mutex_Status _CORE_mutex_Surrender( * transfer the mutex to that thread. */ if ( ( the_thread = _Thread_queue_First_locked( &the_mutex->Wait_queue ) ) ) { + bool unblock; + /* * We must extract the thread now since this will restore its default * thread lock. This is necessary to avoid a deadlock in the * _Thread_Change_priority() below due to a recursive thread queue lock * acquire. */ - _Thread_queue_Extract_locked( + unblock = _Thread_queue_Extract_locked( &the_mutex->Wait_queue.Queue, the_mutex->Wait_queue.operations, the_thread @@ -220,6 +222,7 @@ CORE_mutex_Status _CORE_mutex_Surrender( } _Thread_queue_Unblock_critical( + unblock, &the_mutex->Wait_queue.Queue, the_thread, lock_context diff --git a/cpukit/score/src/threadqenqueue.c b/cpukit/score/src/threadqenqueue.c index 5ed01b7a95..1d1581a2fb 100644 --- a/cpukit/score/src/threadqenqueue.c +++ b/cpukit/score/src/threadqenqueue.c @@ -100,27 +100,20 @@ void _Thread_queue_Enqueue_critical( _Thread_Dispatch_enable( cpu_self ); } -void _Thread_queue_Extract_locked( +bool _Thread_queue_Extract_locked( Thread_queue_Queue *queue, const Thread_queue_Operations *operations, Thread_Control *the_thread ) { + bool success; + bool unblock; + ( *operations->extract )( queue, the_thread ); _Thread_Wait_set_queue( the_thread, NULL ); _Thread_Wait_restore_default_operations( the_thread ); _Thread_Lock_restore_default( the_thread ); -} - -void _Thread_queue_Unblock_critical( - Thread_queue_Queue *queue, - Thread_Control *the_thread, - ISR_lock_Context *lock_context -) -{ - bool success; - bool unblock; success = _Thread_Wait_flags_try_change_critical( the_thread, @@ -135,6 +128,16 @@ void _Thread_queue_Unblock_critical( unblock = true; } + return unblock; +} + +void _Thread_queue_Unblock_critical( + bool unblock, + Thread_queue_Queue *queue, + Thread_Control *the_thread, + ISR_lock_Context *lock_context +) +{ if ( unblock ) { Per_CPU_Control *cpu_self; @@ -156,8 +159,10 @@ void _Thread_queue_Extract_critical( ISR_lock_Context *lock_context ) { - _Thread_queue_Extract_locked( queue, operations, the_thread ); - _Thread_queue_Unblock_critical( queue, the_thread, lock_context ); + bool unblock; + + unblock = _Thread_queue_Extract_locked( queue, operations, the_thread ); + _Thread_queue_Unblock_critical( unblock, queue, the_thread, lock_context ); } void _Thread_queue_Extract( Thread_Control *the_thread ) |