56 lines
938 B
C
56 lines
938 B
C
/*
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* Copyright (C) 2013 Freie Universität Berlin
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*
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* This file subject to the terms and conditions of the GNU Lesser General
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* Public License. See the file LICENSE in the top level directory for more
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* details.
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*/
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/**
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* @ingroup pthread
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* @{
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* @file
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* @brief Spin locks.
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* @author Christian Mehlis <mehlis@inf.fu-berlin.de>
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* @author René Kijewski <kijewski@inf.fu-berlin.de>
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* @}
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*/
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#include "pthread.h"
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int pthread_spin_init(pthread_spinlock_t *lock, int pshared)
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{
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(void) pshared;
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*lock = 0;
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return 0;
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}
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int pthread_spin_destroy(pthread_spinlock_t *lock)
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{
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(void) lock;
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return 0;
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}
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int pthread_spin_lock(pthread_spinlock_t *lock)
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{
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while (*lock) {
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; /* spin */
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}
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return 0;
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}
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int pthread_spin_trylock(pthread_spinlock_t *lock)
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{
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if (*lock) {
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return 0;
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}
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return -1;
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}
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int pthread_spin_unlock(pthread_spinlock_t *lock)
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{
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--*lock;
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return 0;
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}
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