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October 15, 2021 09:25
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Implementation of pthread_rwlock_clockwrlock
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/** | |
* @file | |
* | |
* @ingroup POSIXAPI | |
* | |
* @brief Attempt to Obtain a Write lock on a RWLock instance | |
*/ | |
/* | |
* POSIX RWLock Manager -- Attempt to Obtain a Write Lock on a RWLock Instance | |
* The timeout is specified by abstime on the clock specified by clock_id. | |
*/ | |
/* | |
* Copyright (C) 2021 Matthew Joyce | |
* COPYRIGHT (c) 1989-2008 | |
* On-Line Applications Research Corporation (OAR) | |
* | |
* Redistribution and use in source and binary forms, with or without | |
* modification, are permitted provided that the following conditions | |
* are met: | |
* 1. Redistributions of source code must retain the above copyright | |
* notice, this list of conditions and the following disclaimer. | |
* 2. Redistributions in binary form must reproduce the above copyright | |
* notice, this list of conditions and the following disclaimer in the | |
* documentation and/or other materials provided with the distribution. | |
* | |
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
* POSSIBILITY OF SUCH DAMAGE. | |
*/ | |
/* Defining to have access to function prototype in libc/include/pthread.h */ | |
#define _GNU_SOURCE | |
#ifdef HAVE_CONFIG_H | |
#include "config.h" | |
#endif | |
#include <rtems/posix/rwlockimpl.h> | |
#include <rtems/posix/posixapi.h> | |
#include <stdio.h> | |
/* The POSIX Issue 8 Standard adds pthread_rwlock_clockwrlock */ | |
int pthread_rwlock_clockwrlock( | |
pthread_rwlock_t *rwlock, | |
clockid_t clock_id, | |
const struct timespec *abstime | |
) | |
{ | |
POSIX_RWLock_Control *the_rwlock; | |
Thread_queue_Context queue_context; | |
Status_Control status; | |
the_rwlock = _POSIX_RWLock_Get( rwlock ); | |
POSIX_RWLOCK_VALIDATE_OBJECT( the_rwlock ); | |
_Thread_queue_Context_initialize( &queue_context ); | |
/* | |
* The POSIX Issue 8 Standard specifies a return value of EINVAL if | |
* the abstime nsec value is less than zero or greater than or equal to | |
* 1 billion. | |
*/ | |
if ( abstime->tv_nsec < 0 ) { | |
return EINVAL; | |
} | |
if ( abstime->tv_nsec >= 1000000000 ) { | |
return EINVAL; | |
} | |
if ( clock_id == CLOCK_REALTIME ) { | |
_Thread_queue_Context_set_enqueue_timeout_realtime_timespec( | |
&queue_context, | |
abstime, | |
true | |
); | |
} | |
else if ( clock_id == CLOCK_MONOTONIC ) { | |
_Thread_queue_Context_set_enqueue_timeout_monotonic_timespec( | |
&queue_context, | |
abstime, | |
true | |
); | |
} | |
/* | |
* The POSIX Issue 8 Standard specifies a return value of EINVAL if | |
* the clock_id parameter is not CLOCK_REALTIME or CLOCK_MONOTONIC | |
*/ | |
else { | |
return EINVAL; | |
} | |
status = _CORE_RWLock_Seize_for_writing( | |
&the_rwlock->RWLock, | |
true, | |
&queue_context | |
); | |
return _POSIX_Get_error( status ); | |
} |
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