posix/src/condinit.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  *  @file
0005  *
0006  *  @brief Initialize a Condition Variable
0007  *  @ingroup POSIXAPI
0008  */
0009
0010 /*
0011  *  COPYRIGHT (c) 1989-2007.
0012  *  On-Line Applications Research Corporation (OAR).
0013  *
0014  * Redistribution and use in source and binary forms, with or without
0015  * modification, are permitted provided that the following conditions
0016  * are met:
0017  * 1. Redistributions of source code must retain the above copyright
0018  *    notice, this list of conditions and the following disclaimer.
0019  * 2. Redistributions in binary form must reproduce the above copyright
0020  *    notice, this list of conditions and the following disclaimer in the
0021  *    documentation and/or other materials provided with the distribution.
0022  *
0023  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0024  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0025  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0026  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0027  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0028  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0029  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0030  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0031  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0032  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0033  * POSSIBILITY OF SUCH DAMAGE.
0034  */
0035
0036 #ifdef HAVE_CONFIG_H
0037 #include "config.h"
0038 #endif
0039
0040 #include <rtems/posix/condimpl.h>
0041 #include <rtems/posix/posixapi.h>
0042
0043 RTEMS_STATIC_ASSERT(
0044   offsetof( POSIX_Condition_variables_Control, flags )
0045     == offsetof( pthread_cond_t, _flags ),
0046   POSIX_CONDITION_VARIABLES_CONTROL_FLAGS
0047 );
0048
0049 RTEMS_STATIC_ASSERT(
0050   offsetof( POSIX_Condition_variables_Control, mutex )
0051     == offsetof( pthread_cond_t, _mutex ),
0052   POSIX_CONDITION_VARIABLES_CONTROL_COUNT
0053 );
0054
0055 RTEMS_STATIC_ASSERT(
0056   offsetof( POSIX_Condition_variables_Control, Queue )
0057     == offsetof( pthread_cond_t, _Queue ),
0058   POSIX_CONDITION_VARIABLES_CONTROL_QUEUE
0059 );
0060
0061 RTEMS_STATIC_ASSERT(
0062   sizeof( POSIX_Condition_variables_Control ) == sizeof( pthread_cond_t ),
0063   POSIX_CONDITION_VARIABLES_CONTROL_SIZE
0064 );
0065
0066 /**
0067  *  11.4.2 Initializing and Destroying a Condition Variable,
0068  *         P1003.1c/Draft 10, p. 87
0069  */
0070 int pthread_cond_init(
0071   pthread_cond_t           *cond,
0072   const pthread_condattr_t *attr
0073 )
0074 {
0075   POSIX_Condition_variables_Control *the_cond;
0076
0077   the_cond = _POSIX_Condition_variables_Get( cond );
0078
0079   if ( the_cond == NULL ) {
0080     return EINVAL;
0081   }
0082
0083   if ( attr == NULL ) {
0084     attr = &_POSIX_Condition_variables_Default_attributes;
0085   }
0086
0087   if ( !attr->is_initialized ) {
0088     return EINVAL;
0089   }
0090
0091   if ( !_POSIX_Is_valid_pshared( attr->process_shared ) ) {
0092     return EINVAL;
0093   }
0094
0095   _POSIX_Condition_variables_Initialize( the_cond, attr );
0096   return 0;
0097 }