diff options
Diffstat (limited to '')
| -rw-r--r-- | cpukit/score/src/coremutexsurrender.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/cpukit/score/src/coremutexsurrender.c b/cpukit/score/src/coremutexsurrender.c index e6f52e229d..839c0af5bf 100644 --- a/cpukit/score/src/coremutexsurrender.c +++ b/cpukit/score/src/coremutexsurrender.c @@ -6,7 +6,7 @@ * This package is the implementation of the Mutex Handler. * This handler provides synchronization and mutual exclusion capabilities. * - * COPYRIGHT (c) 1989-1999. + * COPYRIGHT (c) 1989-2006. * On-Line Applications Research Corporation (OAR). * * The license and distribution terms for this file may be @@ -90,6 +90,10 @@ CORE_mutex_Status _CORE_mutex_Surrender( } } + /* + * Formally release the mutex before possibly transferring it to a + * blocked thread. + */ if ( _CORE_mutex_Is_inherit_priority( &the_mutex->Attributes ) || _CORE_mutex_Is_priority_ceiling( &the_mutex->Attributes ) ) holder->resource_count--; @@ -101,7 +105,6 @@ CORE_mutex_Status _CORE_mutex_Surrender( * inherited priority must be lowered if this is the last * mutex (i.e. resource) this task has. */ - if ( _CORE_mutex_Is_inherit_priority( &the_mutex->Attributes ) || _CORE_mutex_Is_priority_ceiling( &the_mutex->Attributes ) ) { if ( holder->resource_count == 0 && @@ -110,6 +113,10 @@ CORE_mutex_Status _CORE_mutex_Surrender( } } + /* + * Now we check if another thread was waiting for this mutex. If so, + * transfer the mutex to that thread. + */ if ( ( the_thread = _Thread_queue_Dequeue( &the_mutex->Wait_queue ) ) ) { #if defined(RTEMS_MULTIPROCESSING) |