rt-thread/components/pthreads/pthread_spin.c

84 lines
1.7 KiB
C

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