dep/src/zthread/linux/FastRecursiveLock.h

   1 /*
   2  * Copyright (c) 2005, Eric Crahen
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a copy
   5  * of this software and associated documentation files (the "Software"), to deal
   6  * in the Software without restriction, including without limitation the rights
   7  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   8  * copies of the Software, and to permit persons to whom the Software is furnished
   9  * to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in all
  12  * copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  17  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  18  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  19  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  20  *
  21  */
  22
  23 #ifndef __ZTFASTRECURSIVELOCK_H__
  24 #define __ZTFASTRECURSIVELOCK_H__
  25
  26 #include "zthread/NonCopyable.h"
  27 #include <pthread.h>
  28
  29 namespace ZThread {
  30
  31 /**
  32  * @class FastRecursiveLock
  33  *
  34  * @author Eric Crahen <http://www.code-foo.com>
  35  * @date <2003-07-16T23:27:14-0400>
  36  * @version 2.2.0
  37  *
  38  * This implementation of a FastRecursiveLock uses the recursive mutex
  39  * that linux pthreads provides.
  40  */
  41 class FastRecursiveLock : private NonCopyable {
  42
  43   pthread_mutex_t _mtx;
  44
  45 public:
  46
  47   inline FastRecursiveLock() {
  48
  49     static const pthread_mutexattr_t attr = { PTHREAD_MUTEX_RECURSIVE_NP };
  50     pthread_mutex_init(&_mtx, &attr);
  51
  52   }
  53
  54   inline ~FastRecursiveLock() {
  55
  56     pthread_mutex_destroy(&_mtx);
  57
  58   }
  59
  60   inline void acquire() {
  61
  62     pthread_mutex_lock(&_mtx);
  63
  64   }
  65
  66   inline void release() {
  67
  68     pthread_mutex_unlock(&_mtx);
  69
  70   }
  71
  72   inline bool tryAcquire(unsigned long timeout=0) {
  73
  74     return (pthread_mutex_trylock(&_mtx) == 0);
  75
  76   }
  77
  78 }; /* FastRecursiveLock */
  79
  80
  81 } // namespace ZThread
  82
  83 #endif