once.c

来自「rtai-3.1-test3的源代码(Real-Time Application」· C语言 代码 · 共 37 行

/*
 * Written by Gilles Chanteperdrix <[e-mail]>.
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include "pse51/internal.h"

int pthread_once(pthread_once_t *once, void (*init_routine)(void))
{
    xnmutex_lock(&__imutex);
    if(!pse51_obj_active(once,PSE51_ONCE_MAGIC,pthread_once_t) || !init_routine){
        xnmutex_unlock(&__imutex);
        return EINVAL;
    }

    if(!once->routine_called) {
        init_routine();
        once->routine_called = 1;
    }

    xnmutex_unlock(&__imutex);
    return 0;    
}