/* * 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 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; }