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      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:
     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 
     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:
     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 
    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:
    118   CritScope(CriticalSection *pcrit) {
    119     pcrit_ = pcrit;
    120     pcrit_->Enter();
    121   }
    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