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
|
/*************************************************************************/
/* mutex.h */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* http://www.godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2016 Juan Linietsky, Ariel Manzur. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#ifndef MUTEX_H
#define MUTEX_H
#include "error_list.h"
/**
* @class Mutex
* @author Juan Linietsky
* Portable Mutex (thread-safe locking) implementation.
* Mutexes are always recursive ( they don't self-lock in a single thread ).
* Mutexes can be used with a Lockp object like this, to avoid having to worry about unlocking:
* Lockp( mutex );
*/
class Mutex {
protected:
static Mutex* (*create_func)(bool);
public:
virtual void lock()=0; ///< Lock the mutex, block if locked by someone else
virtual void unlock()=0; ///< Unlock the mutex, let other threads continue
virtual Error try_lock()=0; ///< Attempt to lock the mutex, OK on success, ERROR means it can't lock.
static Mutex * create(bool p_recursive=true); ///< Create a mutex
virtual ~Mutex();
};
class MutexLock {
Mutex *mutex;
public:
MutexLock(Mutex* p_mutex) { mutex=p_mutex; if (mutex) mutex->lock(); }
~MutexLock() { if (mutex) mutex->unlock(); }
};
#endif
|