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Diffstat (limited to 'cpukit/rtems/src/eventtimeout.c')
-rw-r--r-- | cpukit/rtems/src/eventtimeout.c | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/cpukit/rtems/src/eventtimeout.c b/cpukit/rtems/src/eventtimeout.c new file mode 100644 index 0000000000..f170a90f68 --- /dev/null +++ b/cpukit/rtems/src/eventtimeout.c @@ -0,0 +1,76 @@ +/* + * Event Manager + * + * COPYRIGHT (c) 1989-1998. + * On-Line Applications Research Corporation (OAR). + * Copyright assigned to U.S. Government, 1994. + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.OARcorp.com/rtems/license.html. + * + * $Id$ + */ + +#include <rtems/system.h> +#include <rtems/rtems/status.h> +#include <rtems/rtems/event.h> +#include <rtems/score/isr.h> +#include <rtems/score/object.h> +#include <rtems/rtems/options.h> +#include <rtems/score/states.h> +#include <rtems/score/thread.h> +#include <rtems/rtems/tasks.h> + +/*PAGE + * + * _Event_Timeout + * + * This routine processes a thread which timeouts while waiting to + * receive an event_set. It is called by the watchdog handler. + * + * Input parameters: + * id - thread id + * + * Output parameters: NONE + */ + +void _Event_Timeout( + Objects_Id id, + void *ignored +) +{ + Thread_Control *the_thread; + Objects_Locations location; + + the_thread = _Thread_Get( id, &location ); + switch ( location ) { + case OBJECTS_REMOTE: /* impossible */ + case OBJECTS_ERROR: + break; + case OBJECTS_LOCAL: + + /* + * If the event manager is not synchronized, then it is either + * "nothing happened", "timeout", or "satisfied". If the_thread + * is the executing thread, then it is in the process of blocking + * and it is the thread which is responsible for the synchronization + * process. + * + * If it is not satisfied, then it is "nothing happened" and + * this is the "timeout" transition. After a request is satisfied, + * a timeout is not allowed to occur. + */ + + if ( _Event_Sync_state != EVENT_SYNC_SYNCHRONIZED && + _Thread_Is_executing( the_thread ) ) { + if ( _Event_Sync_state != EVENT_SYNC_SATISFIED ) + _Event_Sync_state = EVENT_SYNC_TIMEOUT; + } else { + the_thread->Wait.return_code = RTEMS_TIMEOUT; + _Thread_Unblock( the_thread ); + } + _Thread_Unnest_dispatch(); + break; + } +} |