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
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2012 The Bitcoin developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_SYNC_H
#define BITCOIN_SYNC_H
#include <boost/interprocess/sync/interprocess_recursive_mutex.hpp>
#include <boost/interprocess/sync/scoped_lock.hpp>
#include <boost/interprocess/sync/interprocess_semaphore.hpp>
#include <boost/interprocess/sync/lock_options.hpp>
/** Wrapped boost mutex: supports recursive locking, but no waiting */
typedef boost::interprocess::interprocess_recursive_mutex CCriticalSection;
/** Wrapped boost mutex: supports waiting but not recursive locking */
typedef boost::interprocess::interprocess_mutex CWaitableCriticalSection;
#ifdef DEBUG_LOCKORDER
void EnterCritical(const char* pszName, const char* pszFile, int nLine, void* cs, bool fTry = false);
void LeaveCritical();
#else
void static inline EnterCritical(const char* pszName, const char* pszFile, int nLine, void* cs, bool fTry = false) {}
void static inline LeaveCritical() {}
#endif
/** Wrapper around boost::interprocess::scoped_lock */
template<typename Mutex>
class CMutexLock
{
private:
boost::interprocess::scoped_lock<Mutex> lock;
public:
void Enter(const char* pszName, const char* pszFile, int nLine)
{
if (!lock.owns())
{
EnterCritical(pszName, pszFile, nLine, (void*)(lock.mutex()));
#ifdef DEBUG_LOCKCONTENTION
if (!lock.try_lock())
{
printf("LOCKCONTENTION: %s\n", pszName);
printf("Locker: %s:%d\n", pszFile, nLine);
#endif
lock.lock();
#ifdef DEBUG_LOCKCONTENTION
}
#endif
}
}
void Leave()
{
if (lock.owns())
{
lock.unlock();
LeaveCritical();
}
}
bool TryEnter(const char* pszName, const char* pszFile, int nLine)
{
if (!lock.owns())
{
EnterCritical(pszName, pszFile, nLine, (void*)(lock.mutex()), true);
lock.try_lock();
if (!lock.owns())
LeaveCritical();
}
return lock.owns();
}
CMutexLock(Mutex& mutexIn, const char* pszName, const char* pszFile, int nLine, bool fTry = false) : lock(mutexIn, boost::interprocess::defer_lock)
{
if (fTry)
TryEnter(pszName, pszFile, nLine);
else
Enter(pszName, pszFile, nLine);
}
~CMutexLock()
{
if (lock.owns())
LeaveCritical();
}
operator bool()
{
return lock.owns();
}
boost::interprocess::scoped_lock<Mutex> &GetLock()
{
return lock;
}
};
typedef CMutexLock<CCriticalSection> CCriticalBlock;
#define LOCK(cs) CCriticalBlock criticalblock(cs, #cs, __FILE__, __LINE__)
#define LOCK2(cs1,cs2) CCriticalBlock criticalblock1(cs1, #cs1, __FILE__, __LINE__),criticalblock2(cs2, #cs2, __FILE__, __LINE__)
#define TRY_LOCK(cs,name) CCriticalBlock name(cs, #cs, __FILE__, __LINE__, true)
#define ENTER_CRITICAL_SECTION(cs) \
{ \
EnterCritical(#cs, __FILE__, __LINE__, (void*)(&cs)); \
(cs).lock(); \
}
#define LEAVE_CRITICAL_SECTION(cs) \
{ \
(cs).unlock(); \
LeaveCritical(); \
}
#ifdef MAC_OSX
// boost::interprocess::interprocess_semaphore seems to spinlock on OSX; prefer polling instead
class CSemaphore
{
private:
CCriticalSection cs;
int val;
public:
CSemaphore(int init) : val(init) {}
void wait() {
do {
{
LOCK(cs);
if (val>0) {
val--;
return;
}
}
Sleep(100);
} while(1);
}
bool try_wait() {
LOCK(cs);
if (val>0) {
val--;
return true;
}
return false;
}
void post() {
LOCK(cs);
val++;
}
};
#else
typedef boost::interprocess::interprocess_semaphore CSemaphore;
#endif
/** RAII-style semaphore lock */
class CSemaphoreGrant
{
private:
CSemaphore *sem;
bool fHaveGrant;
public:
void Acquire() {
if (fHaveGrant)
return;
sem->wait();
fHaveGrant = true;
}
void Release() {
if (!fHaveGrant)
return;
sem->post();
fHaveGrant = false;
}
bool TryAcquire() {
if (!fHaveGrant && sem->try_wait())
fHaveGrant = true;
return fHaveGrant;
}
void MoveTo(CSemaphoreGrant &grant) {
grant.Release();
grant.sem = sem;
grant.fHaveGrant = fHaveGrant;
sem = NULL;
fHaveGrant = false;
}
CSemaphoreGrant() : sem(NULL), fHaveGrant(false) {}
CSemaphoreGrant(CSemaphore &sema, bool fTry = false) : sem(&sema), fHaveGrant(false) {
if (fTry)
TryAcquire();
else
Acquire();
}
~CSemaphoreGrant() {
Release();
}
operator bool() {
return fHaveGrant;
}
};
#endif
|
