1 /** @addtogroup MCD_MCDIMPL_DAEMON_SRV 2 * @{ 3 * @file 4 * 5 * Semaphore implementation (pthread wrapper). 6 * 7 * <!-- Copyright Giesecke & Devrient GmbH 2009 - 2012 --> 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. The name of the author may not be used to endorse or promote 18 * products derived from this software without specific prior 19 * written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 22 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 23 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 25 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 27 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 31 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 #ifndef CSEMAPHORE_H_ 34 #define CSEMAPHORE_H_ 35 36 #include "pthread.h" 37 38 /** 39 * Could inherit from CMutex, or use CMutex internally. 40 * Semaphore is a mutex with a counter. Constructor and destructor 41 * code is the same. 42 */ 43 44 class CSemaphore 45 { 46 47 public: 48 49 CSemaphore(int size = 0); 50 51 ~CSemaphore(void); 52 53 void wait(void); 54 bool wait(int sec); 55 56 bool wouldWait(void); 57 58 void signal(void); 59 60 private: 61 62 pthread_mutex_t m_mutex; 63 pthread_cond_t m_cond; 64 int m_waiters_count; 65 int m_count; 66 67 }; 68 69 #endif /*CSEMAPHORE_H_*/ 70 71 /** @} */ 72