1/* 2 * libjingle 3 * Copyright 2004--2005, Google Inc. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, 9 * this list of conditions and the following disclaimer. 10 * 2. 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 * 3. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO 19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28#ifndef TALK_BASE_CRITICALSECTION_H__ 29#define TALK_BASE_CRITICALSECTION_H__ 30 31#ifdef WIN32 32#include "talk/base/win32.h" 33#endif 34 35#ifdef POSIX 36#include <pthread.h> 37#endif 38 39#ifdef _DEBUG 40#define CS_TRACK_OWNER 1 41#endif // _DEBUG 42 43#if CS_TRACK_OWNER 44#define TRACK_OWNER(x) x 45#else // !CS_TRACK_OWNER 46#define TRACK_OWNER(x) 47#endif // !CS_TRACK_OWNER 48 49namespace talk_base { 50 51#ifdef WIN32 52class CriticalSection { 53public: 54 CriticalSection() { 55 InitializeCriticalSection(&crit_); 56 // Windows docs say 0 is not a valid thread id 57 TRACK_OWNER(thread_ = 0); 58 } 59 ~CriticalSection() { 60 DeleteCriticalSection(&crit_); 61 } 62 void Enter() { 63 EnterCriticalSection(&crit_); 64 TRACK_OWNER(thread_ = GetCurrentThreadId()); 65 } 66 void Leave() { 67 TRACK_OWNER(thread_ = 0); 68 LeaveCriticalSection(&crit_); 69 } 70 71#if CS_TRACK_OWNER 72 bool CurrentThreadIsOwner() const { return thread_ == GetCurrentThreadId(); } 73#endif // CS_TRACK_OWNER 74 75private: 76 CRITICAL_SECTION crit_; 77 TRACK_OWNER(DWORD thread_); // The section's owning thread id 78}; 79#endif // WIN32 80 81#ifdef POSIX 82class CriticalSection { 83public: 84 CriticalSection() { 85 pthread_mutexattr_t mutex_attribute; 86 pthread_mutexattr_init(&mutex_attribute); 87 pthread_mutexattr_settype(&mutex_attribute, PTHREAD_MUTEX_RECURSIVE); 88 pthread_mutex_init(&mutex_, &mutex_attribute); 89 pthread_mutexattr_destroy(&mutex_attribute); 90 TRACK_OWNER(thread_ = 0); 91 } 92 ~CriticalSection() { 93 pthread_mutex_destroy(&mutex_); 94 } 95 void Enter() { 96 pthread_mutex_lock(&mutex_); 97 TRACK_OWNER(thread_ = pthread_self()); 98 } 99 void Leave() { 100 TRACK_OWNER(thread_ = 0); 101 pthread_mutex_unlock(&mutex_); 102 } 103 104#if CS_TRACK_OWNER 105 bool CurrentThreadIsOwner() const { return pthread_equal(thread_, pthread_self()); } 106#endif // CS_TRACK_OWNER 107 108private: 109 pthread_mutex_t mutex_; 110 TRACK_OWNER(pthread_t thread_); 111}; 112#endif // POSIX 113 114// CritScope, for serializing exection through a scope 115 116class CritScope { 117public: 118 CritScope(CriticalSection *pcrit) { 119 pcrit_ = pcrit; 120 pcrit_->Enter(); 121 } 122 ~CritScope() { 123 pcrit_->Leave(); 124 } 125private: 126 CriticalSection *pcrit_; 127}; 128 129} // namespace talk_base 130 131#endif // TALK_BASE_CRITICALSECTION_H__ 132