1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
|
/*
* libjingle
* Copyright 2004--2005, Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _criticalsection_h_
#define _criticalsection_h_
#ifdef WIN32
#include "talk/base/win32.h"
#endif
#ifdef POSIX
#include <pthread.h>
#endif
#ifdef _DEBUG
#define CS_TRACK_OWNER 1
#endif // _DEBUG
#ifdef CS_TRACK_OWNER
#define TRACK_OWNER(x) x
#else // !CS_TRACK_OWNER
#define TRACK_OWNER(x)
#endif // !CS_TRACK_OWNER
namespace cricket {
#ifdef WIN32
class CriticalSection {
public:
CriticalSection() {
InitializeCriticalSection(&crit_);
// Windows docs say 0 is not a valid thread id
TRACK_OWNER(thread_ = 0);
}
~CriticalSection() {
DeleteCriticalSection(&crit_);
}
void Enter() {
EnterCriticalSection(&crit_);
TRACK_OWNER(thread_ = GetCurrentThreadId());
}
void Leave() {
TRACK_OWNER(thread_ = 0);
LeaveCriticalSection(&crit_);
}
#ifdef CS_TRACK_OWNER
bool CurrentThreadIsOwner() const { return thread_ == GetCurrentThreadId(); }
#endif // CS_TRACK_OWNER
private:
CRITICAL_SECTION crit_;
TRACK_OWNER(DWORD thread_); // The section's owning thread id
};
#endif // WIN32
#ifdef POSIX
class CriticalSection {
public:
CriticalSection() {
pthread_mutexattr_t mutex_attribute;
pthread_mutexattr_settype(&mutex_attribute, PTHREAD_MUTEX_RECURSIVE);
pthread_mutex_init(&mutex_, &mutex_attribute);
}
~CriticalSection() {
pthread_mutex_destroy(&mutex_);
}
void Enter() {
pthread_mutex_lock(&mutex_);
}
void Leave() {
pthread_mutex_unlock(&mutex_);
}
private:
pthread_mutex_t mutex_;
};
#endif // POSIX
// CritScope, for serializing exection through a scope
class CritScope {
public:
CritScope(CriticalSection *pcrit) {
pcrit_ = pcrit;
pcrit_->Enter();
}
~CritScope() {
pcrit_->Leave();
}
private:
CriticalSection *pcrit_;
};
} // namespace cricket
#endif // _criticalsection_h_
|
