-
Notifications
You must be signed in to change notification settings - Fork 59
Expand file tree
/
Copy pathmutex.h
More file actions
229 lines (194 loc) · 5.98 KB
/
mutex.h
File metadata and controls
229 lines (194 loc) · 5.98 KB
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
217
218
219
220
221
222
223
224
225
226
227
228
229
/*
Copyright (c) 2005-2019 Intel Corporation
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#ifndef __TBB_mutex_H
#define __TBB_mutex_H
#if _WIN32||_WIN64
#include "machine/windows_api.h"
#else
#include <pthread.h>
#endif /* _WIN32||_WIN64 */
#include <new>
#include "aligned_space.h"
#include "tbb_stddef.h"
#include "tbb_profiling.h"
namespace tbb {
//! Wrapper around the platform's native lock.
/** @ingroup synchronization */
class mutex : internal::mutex_copy_deprecated_and_disabled {
public:
//! Construct unacquired mutex.
mutex() {
#if TBB_USE_ASSERT || TBB_USE_THREADING_TOOLS
internal_construct();
#else
#if _WIN32||_WIN64
InitializeCriticalSectionEx(&impl, 4000, 0);
#else
int error_code = pthread_mutex_init(&impl,NULL);
if( error_code )
tbb::internal::handle_perror(error_code,"mutex: pthread_mutex_init failed");
#endif /* _WIN32||_WIN64*/
#endif /* TBB_USE_ASSERT */
};
~mutex() {
#if TBB_USE_ASSERT
internal_destroy();
#else
#if _WIN32||_WIN64
DeleteCriticalSection(&impl);
#else
pthread_mutex_destroy(&impl);
#endif /* _WIN32||_WIN64 */
#endif /* TBB_USE_ASSERT */
};
class scoped_lock;
friend class scoped_lock;
//! The scoped locking pattern
/** It helps to avoid the common problem of forgetting to release lock.
It also nicely provides the "node" for queuing locks. */
class scoped_lock : internal::no_copy {
public:
//! Construct lock that has not acquired a mutex.
scoped_lock() : my_mutex(NULL) {};
//! Acquire lock on given mutex.
scoped_lock( mutex& mutex ) {
acquire( mutex );
}
//! Release lock (if lock is held).
~scoped_lock() {
if( my_mutex )
release();
}
//! Acquire lock on given mutex.
void acquire( mutex& mutex ) {
#if TBB_USE_ASSERT
internal_acquire(mutex);
#else
mutex.lock();
my_mutex = &mutex;
#endif /* TBB_USE_ASSERT */
}
//! Try acquire lock on given mutex.
bool try_acquire( mutex& mutex ) {
#if TBB_USE_ASSERT
return internal_try_acquire (mutex);
#else
bool result = mutex.try_lock();
if( result )
my_mutex = &mutex;
return result;
#endif /* TBB_USE_ASSERT */
}
//! Release lock
void release() {
#if TBB_USE_ASSERT
internal_release ();
#else
my_mutex->unlock();
my_mutex = NULL;
#endif /* TBB_USE_ASSERT */
}
private:
//! The pointer to the current mutex to work
mutex* my_mutex;
//! All checks from acquire using mutex.state were moved here
void __TBB_EXPORTED_METHOD internal_acquire( mutex& m );
//! All checks from try_acquire using mutex.state were moved here
bool __TBB_EXPORTED_METHOD internal_try_acquire( mutex& m );
//! All checks from release using mutex.state were moved here
void __TBB_EXPORTED_METHOD internal_release();
friend class mutex;
};
// Mutex traits
static const bool is_rw_mutex = false;
static const bool is_recursive_mutex = false;
static const bool is_fair_mutex = false;
// ISO C++0x compatibility methods
//! Acquire lock
void lock() {
#if TBB_USE_ASSERT
aligned_space<scoped_lock> tmp;
new(tmp.begin()) scoped_lock(*this);
#else
#if _WIN32||_WIN64
EnterCriticalSection(&impl);
#else
int error_code = pthread_mutex_lock(&impl);
if( error_code )
tbb::internal::handle_perror(error_code,"mutex: pthread_mutex_lock failed");
#endif /* _WIN32||_WIN64 */
#endif /* TBB_USE_ASSERT */
}
//! Try acquiring lock (non-blocking)
/** Return true if lock acquired; false otherwise. */
bool try_lock() {
#if TBB_USE_ASSERT
aligned_space<scoped_lock> tmp;
scoped_lock& s = *tmp.begin();
s.my_mutex = NULL;
return s.internal_try_acquire(*this);
#else
#if _WIN32||_WIN64
return TryEnterCriticalSection(&impl)!=0;
#else
return pthread_mutex_trylock(&impl)==0;
#endif /* _WIN32||_WIN64 */
#endif /* TBB_USE_ASSERT */
}
//! Release lock
void unlock() {
#if TBB_USE_ASSERT
aligned_space<scoped_lock> tmp;
scoped_lock& s = *tmp.begin();
s.my_mutex = this;
s.internal_release();
#else
#if _WIN32||_WIN64
LeaveCriticalSection(&impl);
#else
pthread_mutex_unlock(&impl);
#endif /* _WIN32||_WIN64 */
#endif /* TBB_USE_ASSERT */
}
//! Return native_handle
#if _WIN32||_WIN64
typedef LPCRITICAL_SECTION native_handle_type;
#else
typedef pthread_mutex_t* native_handle_type;
#endif
native_handle_type native_handle() { return (native_handle_type) &impl; }
enum state_t {
INITIALIZED=0x1234,
DESTROYED=0x789A,
HELD=0x56CD
};
private:
#if _WIN32||_WIN64
CRITICAL_SECTION impl;
enum state_t state;
#else
pthread_mutex_t impl;
#endif /* _WIN32||_WIN64 */
//! All checks from mutex constructor using mutex.state were moved here
void __TBB_EXPORTED_METHOD internal_construct();
//! All checks from mutex destructor using mutex.state were moved here
void __TBB_EXPORTED_METHOD internal_destroy();
#if _WIN32||_WIN64
public:
//! Set the internal state
void set_state( state_t to ) { state = to; }
#endif
};
__TBB_DEFINE_PROFILING_SET_NAME(mutex)
} // namespace tbb
#endif /* __TBB_mutex_H */