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78 lines
1.5 KiB
C
78 lines
1.5 KiB
C
/*
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* Copyright (C) 2013 Freie Universität Berlin
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @{
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*
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* @file
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*
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* @author Christian Mehlis <mehlis@inf.fu-berlin.de>
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* @author Martine Lenders <mlenders@inf.fu-berlin.de>
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* @author René Kijewski <kijewski@inf.fu-berlin.de>
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*/
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#include <errno.h>
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#include <inttypes.h>
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#include "irq.h"
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#include "sched.h"
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#include "sema.h"
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#include "tcb.h"
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#include "timex.h"
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#include "thread.h"
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#include "xtimer.h"
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#define ENABLE_DEBUG (0)
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#include "debug.h"
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#include "semaphore.h"
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int sem_timedwait(sem_t *sem, const struct timespec *abstime)
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{
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uint64_t now, timeout = (((uint64_t)abstime->tv_sec) * SEC_IN_USEC) +
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(abstime->tv_nsec / USEC_IN_NS);
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int res;
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now = xtimer_now64();
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if (now > timeout) {
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errno = ETIMEDOUT;
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return -1;
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}
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timeout = timeout - now;
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res = sema_wait_timed((sema_t *)sem, timeout);
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if (res < 0) {
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errno = -res;
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return -1;
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}
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return 0;
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}
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int sem_trywait(sem_t *sem)
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{
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unsigned int old_state, value;
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int result;
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if (sem == NULL) {
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errno = EINVAL;
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return -1;
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}
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old_state = disableIRQ();
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value = sem->value;
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if (value == 0) {
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errno = EAGAIN;
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result = -1;
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}
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else {
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result = 0;
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sem->value = value - 1;
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}
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restoreIRQ(old_state);
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return result;
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}
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/** @} */
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