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/*
* $Id$
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <errno.h>
#include <pthread.h>
#include <rtems/system.h>
#include <rtems/score/coremutex.h>
#include <rtems/score/watchdog.h>
#if defined(RTEMS_MULTIPROCESSING)
#include <rtems/score/mpci.h>
#endif
#include <rtems/posix/mutex.h>
#include <rtems/posix/priority.h>
#include <rtems/posix/time.h>
/*PAGE
*
* 11.3.3 Locking and Unlocking a Mutex, P1003.1c/Draft 10, p. 93
*
* NOTE: P1003.4b/D8 adds pthread_mutex_timedlock(), p. 29
*/
int pthread_mutex_timedlock(
pthread_mutex_t *mutex,
const struct timespec *abstime
)
{
Watchdog_Interval ticks;
boolean do_wait;
POSIX_Absolute_timeout_conversion_results_t status;
int lock_status;
/*
* POSIX requires that blocking calls with timeouts that take
* an absolute timeout must ignore issues with the absolute
* time provided if the operation would otherwise succeed.
* So we check the abstime provided, and hold on to whether it
* is valid or not. If it isn't correct and in the future,
* then we do a polling operation and convert the UNSATISFIED
* status into the appropriate error.
*/
status = _POSIX_Absolute_timeout_to_ticks( abstime, &ticks );
switch ( status ) {
case POSIX_ABSOLUTE_TIMEOUT_INVALID:
case POSIX_ABSOLUTE_TIMEOUT_IS_IN_PAST:
case POSIX_ABSOLUTE_TIMEOUT_IS_NOW:
do_wait = FALSE;
break;
case POSIX_ABSOLUTE_TIMEOUT_IS_IN_FUTURE:
do_wait = TRUE;
break;
}
lock_status = _POSIX_Mutex_Lock_support(
mutex,
do_wait,
ticks
);
/*
* This service only gives us the option to block. We used a polling
* attempt to lock if the abstime was not in the future. If we did
* not obtain the mutex, then not look at the status immediately,
* make sure the right reason is returned.
*/
if ( !do_wait && (lock_status == EBUSY) ) {
switch (lock_status) {
case POSIX_ABSOLUTE_TIMEOUT_INVALID:
return EINVAL;
case POSIX_ABSOLUTE_TIMEOUT_IS_IN_PAST:
case POSIX_ABSOLUTE_TIMEOUT_IS_NOW:
return ETIMEDOUT;
case POSIX_ABSOLUTE_TIMEOUT_IS_IN_FUTURE:
break;
}
}
return lock_status;
}
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