source: rtems/cpukit/rtems/src/eventtimeout.c @ 7d6e94b

/**
 *  @file
 *
 *  @brief Timeout Event
 *  @ingroup ClassicEvent
 */

/*
 *  COPYRIGHT (c) 1989-2008.
 *  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.org/license/LICENSE.
 */

#if HAVE_CONFIG_H
  #include "config.h"
#endif

#include <rtems/rtems/eventimpl.h>
#include <rtems/score/threadimpl.h>

void _Event_Timeout(
  Objects_Id  id,
  void       *arg
)
{
  Thread_Control    *the_thread;
  Objects_Locations  location;
  ISR_lock_Context   lock_context;
  Thread_Wait_flags  wait_flags;
  Thread_Wait_flags  wait_class;
  Thread_Wait_flags  intend_to_block;
  Thread_Wait_flags  blocked;
  bool               success;
  bool               unblock;

  the_thread = _Thread_Acquire( id, &location, &lock_context );
  switch ( location ) {
    case OBJECTS_LOCAL:
      wait_flags = _Thread_Wait_flags_get( the_thread );
      wait_class = wait_flags & THREAD_WAIT_CLASS_MASK;
      intend_to_block = wait_class | THREAD_WAIT_STATE_INTEND_TO_BLOCK;
      blocked = wait_class | THREAD_WAIT_STATE_BLOCKED;
      success = _Thread_Wait_flags_try_change_critical(
        the_thread,
        intend_to_block,
        wait_class | THREAD_WAIT_STATE_INTERRUPT_TIMEOUT
      );

      if ( success ) {
        the_thread->Wait.return_code = RTEMS_TIMEOUT;
        unblock = false;
      } else if ( _Thread_Wait_flags_get( the_thread ) == blocked ) {
        the_thread->Wait.return_code = RTEMS_TIMEOUT;
        _Thread_Wait_flags_set(
          the_thread,
          wait_class | THREAD_WAIT_STATE_TIMEOUT
        );
        unblock = true;
      } else {
        unblock = false;
      }

      if ( unblock ) {
        Per_CPU_Control *cpu_self;

        cpu_self = _Objects_Release_and_thread_dispatch_disable(
          &the_thread->Object,
          &lock_context
        );
        _Giant_Acquire( cpu_self );

        _Thread_Unblock( the_thread );

        _Giant_Release( cpu_self );
        _Thread_Dispatch_enable( cpu_self );
      } else {
        _Objects_Release_and_ISR_enable( &the_thread->Object, &lock_context );
      }

      break;
#if defined(RTEMS_MULTIPROCESSING)
    case OBJECTS_REMOTE:  /* impossible */
#endif
    case OBJECTS_ERROR:
      break;
  }
}