# SbRWMutex.h

    00001 #ifndef COIN_SBRWMUTEX_H
    00002 #define COIN_SBRWMUTEX_H
    00003
    00004 /**************************************************************************\
    00005  *
    00006  *  This file is part of the Coin 3D visualization library.
    00007  *  Copyright (C) 1998-2003 by Systems in Motion.  All rights reserved.
    00008  *
    00009  *  This library is free software; you can redistribute it and/or
    00010  *  modify it under the terms of the GNU General Public License
    00011  *  ("GPL") version 2 as published by the Free Software Foundation.
    00012  *  See the file LICENSE.GPL at the root directory of this source
    00013  *  distribution for additional information about the GNU GPL.
    00014  *
    00015  *  For using Coin with software that can not be combined with the GNU
    00016  *  GPL, and for taking advantage of the additional benefits of our
    00017  *  support services, please contact Systems in Motion about acquiring
    00018  *  a Coin Professional Edition License.
    00019  *
    00020  *  See <URL:http://www.coin3d.org> for  more information.
    00021  *
    00022  *  Systems in Motion, Teknobyen, Abels Gate 5, 7030 Trondheim, NORWAY.
    00023  *  <URL:http://www.sim.no>.
    00024  *
    00025 \**************************************************************************/
    00026
    00027 #include <Inventor/C/threads/rwmutex.h>
    00028
    00029 class SbRWMutex {
    00030 public:
    00031   enum Precedence {
    00032     READ_PRECEDENCE,
    00033     WRITE_PRECEDENCE
    00034   };
    00035
    00036   SbRWMutex(Precedence policy) {
    00037     this->rwmutex = cc_rwmutex_construct_etc(
    00038       (policy == WRITE_PRECEDENCE)? CC_WRITE_PRECEDENCE : CC_READ_PRECEDENCE);
    00039   }
    00040   ~SbRWMutex(void) { cc_rwmutex_destruct(this->rwmutex); }
    00041
    00042   int writeLock(void) {
    00043     return cc_rwmutex_write_lock(this->rwmutex) == CC_OK ? 0 : 1;
    00044   }
    00045   SbBool tryWriteLock(void) {
    00046     return cc_rwmutex_write_try_lock(this->rwmutex) == CC_OK;
    00047   }
    00048   int writeUnlock(void) {
    00049     return cc_rwmutex_write_unlock(this->rwmutex) == CC_OK ? 0 : 1;
    00050   }
    00051
    00052   int readLock(void) {
    00053     return cc_rwmutex_read_lock(this->rwmutex) == CC_OK ? 0 : 1;
    00054   }
    00055   int tryReadLock(void) {
    00056     return cc_rwmutex_read_try_lock(this->rwmutex) == CC_OK;
    00057   }
    00058   int readUnlock(void) {
    00059     return cc_rwmutex_read_unlock(this->rwmutex) == CC_OK ? 0 : 1;
    00060   }
    00061
    00062 private:
    00063   cc_rwmutex * rwmutex;
    00064 };
    00065
    00066 #endif // !COIN_SBRWMUTEX_H