84 lines
1.7 KiB
C
84 lines
1.7 KiB
C
/*
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* File : pthread_spin.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006 - 2010, RT-Thread Development Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Change Logs:
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* Date Author Notes
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* 2010-10-26 Bernard the first version
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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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if (!lock)
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return EINVAL;
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lock->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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if (!lock)
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return EINVAL;
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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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if (!lock)
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return EINVAL;
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while (!(lock->lock))
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{
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lock->lock = 1;
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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 EINVAL;
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if (!(lock->lock))
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{
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lock->lock = 1;
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return 0;
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}
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return EBUSY;
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}
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int pthread_spin_unlock (pthread_spinlock_t *lock)
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{
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if (!lock)
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return EINVAL;
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if (!(lock->lock))
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return EPERM;
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lock->lock = 0;
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return 0;
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}
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