diff options
Diffstat (limited to 'mit-pthreads/include/pthread/mutex.h')
| -rwxr-xr-x | mit-pthreads/include/pthread/mutex.h | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/mit-pthreads/include/pthread/mutex.h b/mit-pthreads/include/pthread/mutex.h new file mode 100755 index 00000000000..e6f1fe58c0f --- /dev/null +++ b/mit-pthreads/include/pthread/mutex.h @@ -0,0 +1,102 @@ +/* ==== mutex.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 93/07/20 proven + * -Started coding this file. + */ + +/* + * New mutex structures + */ +enum pthread_mutextype { + MUTEX_TYPE_STATIC_FAST = 0, + MUTEX_TYPE_FAST = 1, + MUTEX_TYPE_COUNTING_FAST = 2, /* Recursive */ + MUTEX_TYPE_METERED = 3, + MUTEX_TYPE_DEBUG = 4, /* This will have lots of options */ + MUTEX_TYPE_MAX +}; + +#define PTHREAD_MUTEXTYPE_FAST 1 +#define PTHREAD_MUTEXTYPE_DEBUG 4 +#define PTHREAD_MUTEXTYPE_RECURSIVE 2 + +union pthread_mutex_data { + void * m_ptr; + int m_count; +}; + +typedef struct pthread_mutex { + enum pthread_mutextype m_type; + struct pthread_queue m_queue; + struct pthread * m_owner; + semaphore m_lock; + union pthread_mutex_data m_data; + long m_flags; +} pthread_mutex_t; + +typedef struct pthread_mutexattr { + enum pthread_mutextype m_type; + long m_flags; +} pthread_mutexattr_t; + +/* + * Flags for mutexes. + */ +#define MUTEX_FLAGS_PRIVATE 0x01 +#define MUTEX_FLAGS_INITED 0x02 +#define MUTEX_FLAGS_BUSY 0x04 + +/* + * Static mutex initialization values. + */ +#define PTHREAD_MUTEX_INITIALIZER \ +{ MUTEX_TYPE_STATIC_FAST, PTHREAD_QUEUE_INITIALIZER, \ + NULL, SEMAPHORE_CLEAR, { NULL }, MUTEX_FLAGS_INITED } + +/* + * New functions + */ + +__BEGIN_DECLS + +int pthread_mutex_init __P_((pthread_mutex_t *, const pthread_mutexattr_t *)); +int pthread_mutex_lock __P_((pthread_mutex_t *)); +int pthread_mutex_unlock __P_((pthread_mutex_t *)); +int pthread_mutex_trylock __P_((pthread_mutex_t *)); +int pthread_mutex_destroy __P_((pthread_mutex_t *)); + +__END_DECLS + |