atommutex.h

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00001 /*
00002  * Copyright (c) 2010, Kelvin Lawson. All rights reserved.
00003  *
00004  * Redistribution and use in source and binary forms, with or without
00005  * modification, are permitted provided that the following conditions
00006  * are met:
00007  *
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  * 3. No personal names or organizations' names associated with the
00014  *    Atomthreads project may be used to endorse or promote products
00015  *    derived from this software without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE ATOMTHREADS PROJECT AND CONTRIBUTORS
00018  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
00019  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
00020  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE
00021  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
00022  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
00023  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
00024  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
00025  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
00026  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
00027  * POSSIBILITY OF SUCH DAMAGE.
00028  */
00029 #ifndef __ATOM_MUTEX_H
00030 #define __ATOM_MUTEX_H
00031 
00032 typedef struct atom_mutex
00033 {
00034     ATOM_TCB *  suspQ;  /* Queue of threads suspended on this mutex */
00035     ATOM_TCB *  owner;  /* Thread which currently owns the lock */
00036     uint8_t     count;  /* Recursive count of locks by the owner  */
00037 } ATOM_MUTEX;
00038 
00039 extern uint8_t atomMutexCreate (ATOM_MUTEX *mutex);
00040 extern uint8_t atomMutexDelete (ATOM_MUTEX *mutex);
00041 extern uint8_t atomMutexGet (ATOM_MUTEX *mutex, int32_t timeout);
00042 extern uint8_t atomMutexPut (ATOM_MUTEX *mutex);
00043 
00044 #endif /* __ATOM_MUTEX_H */

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