score/src/threadsetstate.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup RTEMSScoreThread
0007  *
0008  * @brief This source file contains the implementation of
0009  *   _Thread_Set_state_locked() and _Thread_Set_state.
0010  */
0011
0012 /*
0013  *  Thread Handler / Thread Set State
0014  *
0015  *  COPYRIGHT (c) 1989-2011.
0016  *  On-Line Applications Research Corporation (OAR).
0017  *
0018  * Redistribution and use in source and binary forms, with or without
0019  * modification, are permitted provided that the following conditions
0020  * are met:
0021  * 1. Redistributions of source code must retain the above copyright
0022  *    notice, this list of conditions and the following disclaimer.
0023  * 2. Redistributions in binary form must reproduce the above copyright
0024  *    notice, this list of conditions and the following disclaimer in the
0025  *    documentation and/or other materials provided with the distribution.
0026  *
0027  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0028  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0029  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0030  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0031  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0032  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0033  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0034  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0035  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0036  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0037  * POSSIBILITY OF SUCH DAMAGE.
0038  */
0039
0040 #ifdef HAVE_CONFIG_H
0041 #include "config.h"
0042 #endif
0043
0044 #include <rtems/score/threadimpl.h>
0045 #include <rtems/score/assert.h>
0046 #include <rtems/score/schedulerimpl.h>
0047
0048 States_Control _Thread_Set_state_locked(
0049   Thread_Control *the_thread,
0050   States_Control  state
0051 )
0052 {
0053   States_Control previous_state;
0054   States_Control next_state;
0055
0056   _Assert( state != 0 );
0057   _Assert( _Thread_State_is_owner( the_thread ) );
0058
0059   previous_state = the_thread->current_state;
0060   next_state = _States_Set( state, previous_state);
0061   the_thread->current_state = next_state;
0062
0063   if ( _States_Is_ready( previous_state ) ) {
0064     _Scheduler_Block( the_thread );
0065   }
0066
0067   return previous_state;
0068 }
0069
0070 States_Control _Thread_Set_state(
0071   Thread_Control *the_thread,
0072   States_Control  state
0073 )
0074 {
0075   ISR_lock_Context lock_context;
0076   States_Control   previous_state;
0077
0078   _Thread_State_acquire( the_thread, &lock_context );
0079   previous_state = _Thread_Set_state_locked( the_thread, state );
0080   _Thread_State_release( the_thread, &lock_context );
0081
0082   return previous_state;
0083 }