diff options
Diffstat (limited to 'cpukit/score/src/threadblockingoperationcancel.c')
-rw-r--r-- | cpukit/score/src/threadblockingoperationcancel.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/cpukit/score/src/threadblockingoperationcancel.c b/cpukit/score/src/threadblockingoperationcancel.c new file mode 100644 index 0000000000..354df0c7e9 --- /dev/null +++ b/cpukit/score/src/threadblockingoperationcancel.c @@ -0,0 +1,89 @@ +/* + * Cancel Thread Blocking Operation + * + * + * COPYRIGHT (c) 1989-2007. + * 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/thread.h> +#if defined(RTEMS_DEBUG) +#include <rtems/score/interr.h> +#endif + +void _Thread_blocking_operation_Cancel( +#if defined(RTEMS_DEBUG) + Thread_blocking_operation_States sync_state, +#else + Thread_blocking_operation_States sync_state __attribute__((unused)), +#endif + Thread_Control *the_thread, + ISR_Level level +) +{ + /* + * Cases that should not happen and why. + * + * THREAD_BLOCKING_OPERATION_SYNCHRONIZED: + * + * This indicates that someone did not enter a blocking + * operation critical section. + * + * THREAD_BLOCKING_OPERATION_NOTHING_HAPPENED: + * + * This indicates that there was nothing to cancel so + * we should not have been called. + */ + + #if defined(RTEMS_DEBUG) + if ( (sync_state == THREAD_BLOCKING_OPERATION_SYNCHRONIZED) || + (sync_state == THREAD_BLOCKING_OPERATION_NOTHING_HAPPENED) ) { + _Internal_error_Occurred( + INTERNAL_ERROR_CORE, + true, + INTERNAL_ERROR_IMPLEMENTATION_BLOCKING_OPERATION_CANCEL + ); + } + #endif + + /* + * The thread is not waiting on anything after this completes. + */ + the_thread->Wait.queue = NULL; + + /* + * If the sync state is timed out, this is very likely not needed. + * But better safe than sorry when it comes to critical sections. + */ + if ( _Watchdog_Is_active( &the_thread->Timer ) ) { + _Watchdog_Deactivate( &the_thread->Timer ); + _ISR_Enable( level ); + (void) _Watchdog_Remove( &the_thread->Timer ); + } else + _ISR_Enable( level ); + + /* + * Global objects with thread queue's should not be operated on from an + * ISR. But the sync code still must allow short timeouts to be processed + * correctly. + */ + + _Thread_Unblock( the_thread ); + +#if defined(RTEMS_MULTIPROCESSING) + if ( !_Objects_Is_local_id( the_thread->Object.id ) ) + _Thread_MP_Free_proxy( the_thread ); +#endif + +} |