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 49 namespace talk_base { 50 51 #ifdef WIN32 52 class CriticalSection { 53 public: CriticalSection()54 CriticalSection() { 55 InitializeCriticalSection(&crit_); 56 // Windows docs say 0 is not a valid thread id 57 TRACK_OWNER(thread_ = 0); 58 } ~CriticalSection()59 ~CriticalSection() { 60 DeleteCriticalSection(&crit_); 61 } Enter()62 void Enter() { 63 EnterCriticalSection(&crit_); 64 TRACK_OWNER(thread_ = GetCurrentThreadId()); 65 } Leave()66 void Leave() { 67 TRACK_OWNER(thread_ = 0); 68 LeaveCriticalSection(&crit_); 69 } 70 71 #if CS_TRACK_OWNER CurrentThreadIsOwner()72 bool CurrentThreadIsOwner() const { return thread_ == GetCurrentThreadId(); } 73 #endif // CS_TRACK_OWNER 74 75 private: 76 CRITICAL_SECTION crit_; 77 TRACK_OWNER(DWORD thread_); // The section's owning thread id 78 }; 79 #endif // WIN32 80 81 #ifdef POSIX 82 class CriticalSection { 83 public: CriticalSection()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 } ~CriticalSection()92 ~CriticalSection() { 93 pthread_mutex_destroy(&mutex_); 94 } Enter()95 void Enter() { 96 pthread_mutex_lock(&mutex_); 97 TRACK_OWNER(thread_ = pthread_self()); 98 } Leave()99 void Leave() { 100 TRACK_OWNER(thread_ = 0); 101 pthread_mutex_unlock(&mutex_); 102 } 103 104 #if CS_TRACK_OWNER CurrentThreadIsOwner()105 bool CurrentThreadIsOwner() const { return pthread_equal(thread_, pthread_self()); } 106 #endif // CS_TRACK_OWNER 107 108 private: 109 pthread_mutex_t mutex_; 110 TRACK_OWNER(pthread_t thread_); 111 }; 112 #endif // POSIX 113 114 // CritScope, for serializing exection through a scope 115 116 class CritScope { 117 public: CritScope(CriticalSection * pcrit)118 CritScope(CriticalSection *pcrit) { 119 pcrit_ = pcrit; 120 pcrit_->Enter(); 121 } ~CritScope()122 ~CritScope() { 123 pcrit_->Leave(); 124 } 125 private: 126 CriticalSection *pcrit_; 127 }; 128 129 } // namespace talk_base 130 131 #endif // TALK_BASE_CRITICALSECTION_H__ 132