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Diffstat (limited to 'src/mutex.h')
-rw-r--r-- | src/mutex.h | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/src/mutex.h b/src/mutex.h new file mode 100644 index 0000000..b5c8b7a --- /dev/null +++ b/src/mutex.h | |||
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1 | /* | ||
2 | * Copyright (C) 2007-2011 Xagasoft, All rights reserved. | ||
3 | * | ||
4 | * This file is part of the libbu++ library and is released under the | ||
5 | * terms of the license contained in the file LICENSE. | ||
6 | */ | ||
7 | |||
8 | #ifndef BU_MUTEX_H | ||
9 | #define BU_MUTEX_H | ||
10 | |||
11 | #include <pthread.h> | ||
12 | |||
13 | namespace Bu | ||
14 | { | ||
15 | /** | ||
16 | * Simple mutex wrapper. Currently this doesn't do anything extra for you | ||
17 | * except keep all of the functionality together in an OO sorta' way and | ||
18 | * keep you from having to worry about cleaning up your mutexes properly, | ||
19 | * or initing them. | ||
20 | *@ingroup Threading | ||
21 | */ | ||
22 | class Mutex | ||
23 | { | ||
24 | public: | ||
25 | /** | ||
26 | * Create an unlocked mutex. | ||
27 | */ | ||
28 | Mutex(); | ||
29 | |||
30 | /** | ||
31 | * Destroy a mutex. This can only be done when a mutex is unlocked. | ||
32 | * Failure to unlock before destroying a mutex object could cause it to | ||
33 | * wait for the mutex to unlock, the odds of which are usually farily | ||
34 | * low at deconstruction time. | ||
35 | */ | ||
36 | ~Mutex(); | ||
37 | |||
38 | /** | ||
39 | * Lock the mutex. This causes all future calls to lock on this | ||
40 | * instance of mutex to block until the first thread that called mutex | ||
41 | * unlocks it. At that point the next thread that called lock will get | ||
42 | * a chance to go to work. Because of the nature of a mutex lock it is | ||
43 | * a very bad idea to do any kind of serious or rather time consuming | ||
44 | * computation within a locked section. This can cause thread-deadlock | ||
45 | * and your program may hang. | ||
46 | */ | ||
47 | int lock(); | ||
48 | |||
49 | /** | ||
50 | * Unlock the mutex. This allows the next thread that asked for a lock | ||
51 | * to lock the mutex and continue with execution. | ||
52 | */ | ||
53 | int unlock(); | ||
54 | |||
55 | /** | ||
56 | * Try to lock the mutex. This is the option to go with if you cannot | ||
57 | * avoid putting lengthy operations within a locked section. trylock | ||
58 | * will attempt to lock the mutex, if the mutex is already locked this | ||
59 | * function returns immediately with an error code. | ||
60 | */ | ||
61 | int trylock(); | ||
62 | |||
63 | protected: | ||
64 | pthread_mutex_t mutex; /**< The internal mutex reference. */ | ||
65 | }; | ||
66 | } | ||
67 | |||
68 | #endif | ||