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
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
|
// -*- Mode: C++; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
// vim:tabstop=4:shiftwidth=4:expandtab:
/*
* Copyright (C) 2004-2008 Wu Yongwei <adah at users dot sourceforge dot net>
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any
* damages arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute
* it freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must
* not claim that you wrote the original software. If you use this
* software in a product, an acknowledgement in the product
* documentation would be appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must
* not be misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source
* distribution.
*
* This file is part of Stones of Nvwa:
* http://sourceforge.net/projects/nvwa
*
* original version changed for ManaPlus
*
* Copyright (C) 2011 ManaPlus developers
*/
/**
* @file fast_mutex.h
*
* A fast mutex implementation for POSIX and Win32.
*
* @version 1.18, 2005/05/06
* @author Wu Yongwei
*
*/
#ifndef M_FAST_MUTEX_H
#define M_FAST_MUTEX_H
# if !defined(_NOTHREADS)
# if !defined(_WIN32THREADS) && \
(defined(_WIN32) && defined(_MT))
// Automatically use _WIN32THREADS when specifying -MT/-MD in MSVC,
// or -mthreads in MinGW GCC.
# define _WIN32THREADS
# elif !defined(_PTHREADS) && \
defined(_REENTRANT)
// Automatically use _PTHREADS when specifying -pthread in GCC.
// N.B. I do not detect on _PTHREAD_H since libstdc++-v3 under
// Linux will silently include <pthread.h> anyway.
# define _PTHREADS
# endif
# endif
# if !defined(_PTHREADS) && !defined(_WIN32THREADS) && !defined(_NOTHREADS)
# define _NOTHREADS
# endif
# if defined(_NOTHREADS)
# if defined(_PTHREADS) || defined(_WIN32THREADS)
# undef _NOTHREADS
# error "Cannot define multi-threaded mode with -D_NOTHREADS"
# if defined(__MINGW32__) && defined(_WIN32THREADS) && !defined(_MT)
# error "Be sure to specify -mthreads with -D_WIN32THREADS"
# endif
# endif
# endif
# ifndef _FAST_MUTEX_CHECK_INITIALIZATION
/**
* Macro to control whether to check for initialization status for each
* lock/unlock operation. Defining it to a non-zero value will enable
* the check, so that the construction/destruction of a static object
* using a static fast_mutex not yet constructed or already destroyed
* will work (with lock/unlock operations ignored). Defining it to zero
* will disable to check.
*/
# define _FAST_MUTEX_CHECK_INITIALIZATION 1
# endif
# if defined(_PTHREADS) && defined(_WIN32THREADS)
// Some C++ libraries have _PTHREADS defined even on Win32 platforms.
// Thus this hack.
# undef _PTHREADS
# endif
# ifdef _DEBUG
# include <stdio.h>
# include <stdlib.h>
/** Macro for fast_mutex assertions. Real version (for debug mode). */
# define _FAST_MUTEX_ASSERT(_Expr, _Msg) \
if (!(_Expr)) { \
fprintf(stderr, "fast_mutex::%s\n", _Msg); \
abort(); \
}
# else
/** Macro for fast_mutex assertions. Fake version (for release mode). */
# define _FAST_MUTEX_ASSERT(_Expr, _Msg) \
((void)0)
# endif
# ifdef _PTHREADS
# include <pthread.h>
/**
* Macro alias to `volatile' semantics. Here it is truly volatile since
* it is in a multi-threaded (POSIX threads) environment.
*/
# define __VOLATILE volatile
/**
* Class for non-reentrant fast mutexes. This is the implementation
* for POSIX threads.
*/
class fast_mutex
{
pthread_mutex_t _M_mtx_impl;
# if _FAST_MUTEX_CHECK_INITIALIZATION
bool _M_initialized;
# endif
# ifdef _DEBUG
bool _M_locked;
# endif
public:
fast_mutex()
# ifdef _DEBUG
: _M_locked(false)
# endif
{
::pthread_mutex_init(&_M_mtx_impl, nullptr);
# if _FAST_MUTEX_CHECK_INITIALIZATION
_M_initialized = true;
# endif
}
~fast_mutex()
{
_FAST_MUTEX_ASSERT(!_M_locked, "~fast_mutex(): still locked");
# if _FAST_MUTEX_CHECK_INITIALIZATION
_M_initialized = false;
# endif
::pthread_mutex_destroy(&_M_mtx_impl);
}
void lock()
{
# if _FAST_MUTEX_CHECK_INITIALIZATION
if (!_M_initialized)
return;
# endif
::pthread_mutex_lock(&_M_mtx_impl);
# ifdef _DEBUG
// The following assertion should _always_ be true for a
// real `fast' pthread_mutex. However, this assertion can
// help sometimes, when people forget to use `-lpthread' and
// glibc provides an empty implementation. Having this
// assertion is also more consistent.
_FAST_MUTEX_ASSERT(!_M_locked, "lock(): already locked");
_M_locked = true;
# endif
}
void unlock()
{
# if _FAST_MUTEX_CHECK_INITIALIZATION
if (!_M_initialized)
return;
# endif
# ifdef _DEBUG
_FAST_MUTEX_ASSERT(_M_locked, "unlock(): not locked");
_M_locked = false;
# endif
::pthread_mutex_unlock(&_M_mtx_impl);
}
private:
fast_mutex(const fast_mutex&);
fast_mutex& operator=(const fast_mutex&);
};
# endif // _PTHREADS
# ifdef _WIN32THREADS
# include <windows.h>
/**
* Macro alias to `volatile' semantics. Here it is truly volatile since
* it is in a multi-threaded (Win32 threads) environment.
*/
# define __VOLATILE volatile
/**
* Class for non-reentrant fast mutexes. This is the implementation
* for Win32 threads.
*/
class fast_mutex
{
CRITICAL_SECTION _M_mtx_impl;
# if _FAST_MUTEX_CHECK_INITIALIZATION
bool _M_initialized;
# endif
# ifdef _DEBUG
bool _M_locked;
# endif
public:
fast_mutex()
# ifdef _DEBUG
: _M_locked(false)
# endif
{
::InitializeCriticalSection(&_M_mtx_impl);
# if _FAST_MUTEX_CHECK_INITIALIZATION
_M_initialized = true;
# endif
}
~fast_mutex()
{
_FAST_MUTEX_ASSERT(!_M_locked, "~fast_mutex(): still locked");
# if _FAST_MUTEX_CHECK_INITIALIZATION
_M_initialized = false;
# endif
::DeleteCriticalSection(&_M_mtx_impl);
}
void lock()
{
# if _FAST_MUTEX_CHECK_INITIALIZATION
if (!_M_initialized)
return;
# endif
::EnterCriticalSection(&_M_mtx_impl);
# ifdef _DEBUG
_FAST_MUTEX_ASSERT(!_M_locked, "lock(): already locked");
_M_locked = true;
# endif
}
void unlock()
{
# if _FAST_MUTEX_CHECK_INITIALIZATION
if (!_M_initialized)
return;
# endif
# ifdef _DEBUG
_FAST_MUTEX_ASSERT(_M_locked, "unlock(): not locked");
_M_locked = false;
# endif
::LeaveCriticalSection(&_M_mtx_impl);
}
private:
fast_mutex(const fast_mutex&);
fast_mutex& operator=(const fast_mutex&);
};
# endif // _WIN32THREADS
# ifdef _NOTHREADS
/**
* Macro alias to `volatile' semantics. Here it is not truly volatile
* since it is in a single-threaded environment.
*/
# define __VOLATILE
/**
* Class for non-reentrant fast mutexes. This is the null
* implementation for single-threaded environments.
*/
class fast_mutex
{
# ifdef _DEBUG
bool _M_locked;
# endif
public:
fast_mutex()
# ifdef _DEBUG
: _M_locked(false)
# endif
{
}
~fast_mutex()
{
_FAST_MUTEX_ASSERT(!_M_locked, "~fast_mutex(): still locked");
}
void lock()
{
# ifdef _DEBUG
_FAST_MUTEX_ASSERT(!_M_locked, "lock(): already locked");
_M_locked = true;
# endif
}
void unlock()
{
# ifdef _DEBUG
_FAST_MUTEX_ASSERT(_M_locked, "unlock(): not locked");
_M_locked = false;
# endif
}
private:
fast_mutex(const fast_mutex&);
fast_mutex& operator=(const fast_mutex&);
};
# endif // _NOTHREADS
/** An acquistion-on-initialization lock class based on fast_mutex. */
class fast_mutex_autolock
{
fast_mutex& _M_mtx;
public:
explicit fast_mutex_autolock(fast_mutex& __mtx) : _M_mtx(__mtx)
{
_M_mtx.lock();
}
~fast_mutex_autolock()
{
_M_mtx.unlock();
}
private:
fast_mutex_autolock(const fast_mutex_autolock&);
fast_mutex_autolock& operator=(const fast_mutex_autolock&);
};
#endif // M_FAST_MUTEX_H
|
