posix/src/cancel.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup POSIXAPI
0007  *
0008  * @brief Canceling Execution of a Thread
0009  */
0010
0011 /*
0012  *  COPYRIGHT (c) 1989-2008.
0013  *  On-Line Applications Research Corporation (OAR).
0014  *
0015  *  Copyright (c) 2016 embedded brains GmbH & Co. KG
0016  *
0017  * Redistribution and use in source and binary forms, with or without
0018  * modification, are permitted provided that the following conditions
0019  * are met:
0020  * 1. Redistributions of source code must retain the above copyright
0021  *    notice, this list of conditions and the following disclaimer.
0022  * 2. Redistributions in binary form must reproduce the above copyright
0023  *    notice, this list of conditions and the following disclaimer in the
0024  *    documentation and/or other materials provided with the distribution.
0025  *
0026  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0027  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0028  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0029  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0030  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0031  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0032  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0033  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0034  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0035  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0036  * POSSIBILITY OF SUCH DAMAGE.
0037  */
0038
0039 #ifdef HAVE_CONFIG_H
0040 #include "config.h"
0041 #endif
0042
0043 #include <pthread.h>
0044 #include <errno.h>
0045
0046 #include <rtems/score/isr.h>
0047 #include <rtems/score/threadimpl.h>
0048
0049 /*
0050  *  18.2.1 Canceling Execution of a Thread, P1003.1c/Draft 10, p. 181
0051  */
0052
0053 int pthread_cancel( pthread_t thread )
0054 {
0055   Thread_Control   *the_thread;
0056   ISR_lock_Context  lock_context;
0057   Thread_Control   *executing;
0058   Per_CPU_Control  *cpu_self;
0059
0060   the_thread = _Thread_Get( thread, &lock_context );
0061
0062   if ( the_thread == NULL ) {
0063     return ESRCH;
0064   }
0065
0066   cpu_self = _Per_CPU_Get();
0067   executing = _Per_CPU_Get_executing( cpu_self );
0068
0069   if (
0070     the_thread == executing &&
0071     !_Per_CPU_Is_ISR_in_progress( cpu_self )
0072   ) {
0073     _ISR_lock_ISR_enable( &lock_context );
0074     _Thread_Exit( PTHREAD_CANCELED, THREAD_LIFE_TERMINATING );
0075   } else {
0076     _Thread_Dispatch_disable_with_CPU( cpu_self, &lock_context );
0077     _ISR_lock_ISR_enable( &lock_context );
0078     (void) _Thread_Cancel( the_thread, executing, 0 );
0079     _Thread_Dispatch_enable( cpu_self );
0080   }
0081   return 0;
0082 }