rtems/src/eventreceive.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup RTEMSImplClassicEvent
0007  *
0008  * @brief This source file contains the implementation of
0009  *   rtems_event_receive().
0010  */
0011
0012 /*
0013  *  COPYRIGHT (c) 1989-1999.
0014  *  On-Line Applications Research Corporation (OAR).
0015  *
0016  * Redistribution and use in source and binary forms, with or without
0017  * modification, are permitted provided that the following conditions
0018  * are met:
0019  * 1. Redistributions of source code must retain the above copyright
0020  *    notice, this list of conditions and the following disclaimer.
0021  * 2. Redistributions in binary form must reproduce the above copyright
0022  *    notice, this list of conditions and the following disclaimer in the
0023  *    documentation and/or other materials provided with the distribution.
0024  *
0025  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0026  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0027  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0028  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0029  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0030  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0031  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0032  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0033  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0034  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0035  * POSSIBILITY OF SUCH DAMAGE.
0036  */
0037
0038 #ifdef HAVE_CONFIG_H
0039 #include "config.h"
0040 #endif
0041
0042 #include <rtems/rtems/eventimpl.h>
0043 #include <rtems/rtems/tasksdata.h>
0044 #include <rtems/score/statesimpl.h>
0045 #include <rtems/score/threadimpl.h>
0046
0047 rtems_status_code rtems_event_receive(
0048   rtems_event_set  event_in,
0049   rtems_option     option_set,
0050   rtems_interval   ticks,
0051   rtems_event_set *event_out
0052 )
0053 {
0054   rtems_status_code sc;
0055
0056   if ( event_out != NULL ) {
0057     ISR_lock_Context   lock_context;
0058     Thread_Control    *executing;
0059     RTEMS_API_Control *api;
0060     Event_Control     *event;
0061
0062     executing = _Thread_Wait_acquire_default_for_executing( &lock_context );
0063     api = executing->API_Extensions[ THREAD_API_RTEMS ];
0064     event = &api->Event;
0065
0066     if ( !_Event_sets_Is_empty( event_in ) ) {
0067       sc = _Event_Seize(
0068         event_in,
0069         option_set,
0070         ticks,
0071         event_out,
0072         executing,
0073         event,
0074         THREAD_WAIT_CLASS_EVENT,
0075         STATES_WAITING_FOR_EVENT,
0076         &lock_context
0077       );
0078     } else {
0079       *event_out = event->pending_events;
0080       _Thread_Wait_release_default( executing, &lock_context );
0081       sc = RTEMS_SUCCESSFUL;
0082     }
0083   } else {
0084     sc = RTEMS_INVALID_ADDRESS;
0085   }
0086
0087   return sc;
0088 }