pthread_once.h
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上传日期:2007-04-14
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- /* ==== pthread_once.h ========================================================
- * Copyright (c) 1993 by Chris Provenzano, proven@mit.edu
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by Chris Provenzano.
- * 4. The name of Chris Provenzano may not be used to endorse or promote
- * products derived from this software without specific prior written
- * permission.
- *
- * THIS SOFTWARE IS PROVIDED BY CHRIS PROVENZANO ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL CHRIS PROVENZANO BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * $Id$
- *
- * Description : mutex header.
- *
- * 1.00 93/12/12 proven
- * -Started coding this file.
- */
-
- /* New pthread_once structures */
- typedef struct pthread_once {
- int state;
- pthread_mutex_t mutex;
- } pthread_once_t;
- /* Static pthread_once_t initialization value. */
- #define PTHREAD_NEEDS_INIT 0
- #define PTHREAD_DONE_INIT 1
- #define PTHREAD_ONCE_INIT { PTHREAD_NEEDS_INIT, PTHREAD_MUTEX_INITIALIZER }
- /* New functions */
- __BEGIN_DECLS
- int pthread_once __P_((pthread_once_t *, void (*init_routine)(void)));
- __END_DECLS
-