rtems/src/taskresume.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup RTEMSImplClassicTask
0007  *
0008  * @brief This source file contains the implementation of
0009  *   rtems_task_resume().
0010  */
0011
0012 /*
0013  *  COPYRIGHT (c) 1989-2014.
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/tasksimpl.h>
0043 #include <rtems/score/threadimpl.h>
0044
0045 rtems_status_code rtems_task_resume(
0046   rtems_id id
0047 )
0048 {
0049   Thread_Control   *the_thread;
0050   ISR_lock_Context  lock_context;
0051   Per_CPU_Control  *cpu_self;
0052   States_Control    previous_state;
0053
0054   the_thread = _Thread_Get( id, &lock_context );
0055
0056   if ( the_thread == NULL ) {
0057 #if defined(RTEMS_MULTIPROCESSING)
0058     return _RTEMS_tasks_MP_Resume( id );
0059 #else
0060     return RTEMS_INVALID_ID;
0061 #endif
0062   }
0063
0064   cpu_self = _Thread_Dispatch_disable_critical( &lock_context );
0065   _ISR_lock_ISR_enable( &lock_context );
0066
0067   previous_state = _Thread_Clear_state( the_thread, STATES_SUSPENDED );
0068
0069   _Thread_Dispatch_enable( cpu_self );
0070   return _States_Is_suspended( previous_state ) ?
0071     RTEMS_SUCCESSFUL : RTEMS_INCORRECT_STATE;
0072 }