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Diffstat (limited to 'cpukit/score/src/schedulerpriorityunblock.c')
-rw-r--r-- | cpukit/score/src/schedulerpriorityunblock.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/cpukit/score/src/schedulerpriorityunblock.c b/cpukit/score/src/schedulerpriorityunblock.c new file mode 100644 index 0000000000..8c0f490c8c --- /dev/null +++ b/cpukit/score/src/schedulerpriorityunblock.c @@ -0,0 +1,48 @@ +/* + * Scheduler Handler + * + * Copyright (C) 2010 Gedare Bloom. + * Copyright (C) 2011 On-Line Applications Research Corporation (OAR). + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.rtems.com/license/LICENSE. + * + * $Id$ + */ + +#if HAVE_CONFIG_H +#include "config.h" +#endif + +#include <rtems/system.h> +#include <rtems/score/scheduler.h> +#include <rtems/score/schedulerpriority.h> + +void _Scheduler_priority_Unblock ( + Thread_Control *the_thread +) +{ + _Scheduler_priority_Ready_queue_enqueue(the_thread); + + /* TODO: flash critical section? */ + + /* + * If the thread that was unblocked is more important than the heir, + * then we have a new heir. This may or may not result in a + * context switch. + * + * Normal case: + * If the current thread is preemptible, then we need to do + * a context switch. + * Pseudo-ISR case: + * Even if the thread isn't preemptible, if the new heir is + * a pseudo-ISR system task, we need to do a context switch. + */ + if ( the_thread->current_priority < _Thread_Heir->current_priority ) { + _Thread_Heir = the_thread; + if ( _Thread_Executing->is_preemptible || + the_thread->current_priority == 0 ) + _Thread_Dispatch_necessary = true; + } +} |