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Diffstat (limited to 'mit-pthreads/include/pthread/pthread_once.h')
| -rwxr-xr-x | mit-pthreads/include/pthread/pthread_once.h | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/mit-pthreads/include/pthread/pthread_once.h b/mit-pthreads/include/pthread/pthread_once.h new file mode 100755 index 00000000000..ac53d5f9b2c --- /dev/null +++ b/mit-pthreads/include/pthread/pthread_once.h @@ -0,0 +1,58 @@ +/* ==== 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 + |