posix/src/pthreadequal.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup POSIXAPI
0007  *
0008  * @brief Compare Thread IDs
0009  */
0010
0011 /*
0012  *  NOTE:  POSIX does not define the behavior when either thread id is invalid.
0013  *
0014  *  COPYRIGHT (c) 1989-2007.
0015  *  On-Line Applications Research Corporation (OAR).
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/posix/pthreadimpl.h>
0047 #include <rtems/score/threadimpl.h>
0048
0049 int pthread_equal(
0050   pthread_t  t1,
0051   pthread_t  t2
0052 )
0053 {
0054   /*
0055    *  If the system is configured for debug, then we will do everything we
0056    *  can to insure that both ids are valid.  Otherwise, we will do the
0057    *  cheapest possible thing to determine if they are equal.
0058    */
0059
0060 #ifndef RTEMS_DEBUG
0061   return _Objects_Are_ids_equal( t1, t2 );
0062 #else
0063   ISR_lock_Context  lock_context_1;
0064   ISR_lock_Context  lock_context_2;
0065   Thread_Control   *thread_1;
0066   Thread_Control   *thread_2;
0067
0068   thread_1 = _Thread_Get( t1, &lock_context_1 );
0069   thread_2 = _Thread_Get( t2, &lock_context_2 );
0070
0071   if ( thread_2 != NULL ) {
0072     _ISR_lock_ISR_enable( &lock_context_2 );
0073   }
0074
0075   if ( thread_1 != NULL ) {
0076     _ISR_lock_ISR_enable( &lock_context_1 );
0077   }
0078
0079   return thread_1 != NULL && thread_1 == thread_2;
0080 #endif
0081 }