1 /******************************************************************************* 2 * Copyright (C) 2004-2008 Intel Corp. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * - Redistributions of source code must retain the above copyright notice, 8 * this list of conditions and the following disclaimer. 9 * 10 * - Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 14 * - Neither the name of Intel Corp. nor the names of its 15 * contributors may be used to endorse or promote products derived from this 16 * software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL Intel Corp. OR THE CONTRIBUTORS 22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 *******************************************************************************/ 30 31 ////////////////////////////////////////////////////////////////////////// 32 // Semaphore.h 33 // 34 // This file contains the definition of the Semaphore class 35 ////////////////////////////////////////////////////////////////////////// 36 #ifndef _LAD_SEMAPHORE_H 37 #define _LAD_SEMAPHORE_H 38 39 class OSSemaphore; 40 41 class Semaphore 42 { 43 public: 44 Semaphore(int maxval = 1); 45 Semaphore (const Semaphore &rhs); 46 ~Semaphore(); 47 48 void acquire(); // blocks until value !=0, and decrements the value 49 void release(); // increments the value by 1 50 bool acquireTry(); // try to acquire the semaphore: return 'true' if succeded 51 52 Semaphore &operator=(const Semaphore &rhs); 53 54 private: 55 OSSemaphore *_osSemaphore; 56 }; 57 58 #endif //_LAD_SEMAPHORE_H 59 60