diff options
Diffstat (limited to 'cpukit/score/src/coresem.c')
| -rw-r--r-- | cpukit/score/src/coresem.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/cpukit/score/src/coresem.c b/cpukit/score/src/coresem.c index b0b471bad6..fde8505c64 100644 --- a/cpukit/score/src/coresem.c +++ b/cpukit/score/src/coresem.c @@ -91,16 +91,26 @@ CORE_semaphore_Status _CORE_semaphore_Surrender( ) { 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 - the_semaphore->count += 1; + } 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( CORE_SEMAPHORE_STATUS_SUCCESSFUL ); + return status; } /*PAGE |