posix/src/condwait.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup POSIXAPI
0007  *
0008  * @brief Waiting on a Condition
0009  */
0010
0011 /*
0012  *  COPYRIGHT (c) 1989-2007.
0013  *  On-Line Applications Research Corporation (OAR).
0014  *
0015  * Redistribution and use in source and binary forms, with or without
0016  * modification, are permitted provided that the following conditions
0017  * are met:
0018  * 1. Redistributions of source code must retain the above copyright
0019  *    notice, this list of conditions and the following disclaimer.
0020  * 2. Redistributions in binary form must reproduce the above copyright
0021  *    notice, this list of conditions and the following disclaimer in the
0022  *    documentation and/or other materials provided with the distribution.
0023  *
0024  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0025  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0026  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0027  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0028  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0029  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0030  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0031  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0032  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0033  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0034  * POSSIBILITY OF SUCH DAMAGE.
0035  */
0036
0037 #ifdef HAVE_CONFIG_H
0038 #include "config.h"
0039 #endif
0040
0041 #include <rtems/posix/condimpl.h>
0042
0043 #include <string.h>
0044
0045 bool _POSIX_Condition_variables_Auto_initialization(
0046   POSIX_Condition_variables_Control *the_cond
0047 )
0048 {
0049   POSIX_Condition_variables_Control zero;
0050   unsigned long                     flags;
0051
0052   memset( &zero, 0, sizeof( zero ) );
0053
0054   if ( memcmp( the_cond, &zero, sizeof( *the_cond ) ) != 0 ) {
0055     return false;
0056   }
0057
0058   flags = (uintptr_t) the_cond ^ POSIX_CONDITION_VARIABLES_MAGIC;
0059   flags &= ~POSIX_CONDITION_VARIABLES_FLAGS_MASK;
0060   the_cond->flags = flags;
0061   return true;
0062 }
0063
0064 /*
0065  *  11.4.4 Waiting on a Condition, P1003.1c/Draft 10, p. 105
0066  */
0067
0068 int pthread_cond_wait(
0069   pthread_cond_t     *cond,
0070   pthread_mutex_t    *mutex
0071 )
0072 {
0073   return _POSIX_Condition_variables_Wait_support(
0074     cond,
0075     mutex,
0076     NULL
0077   );
0078 }