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Diffstat (limited to 'src/stable/thread.h')
-rw-r--r-- | src/stable/thread.h | 107 |
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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_THREAD_H | ||
9 | #define BU_THREAD_H | ||
10 | |||
11 | #include <pthread.h> | ||
12 | |||
13 | namespace Bu | ||
14 | { | ||
15 | /** | ||
16 | * Simple thread class. This wraps the basic pthread (posix threads) | ||
17 | * system in an object oriented sort of way. It allows you to create a | ||
18 | * class with standard member variables and callable functions that can be | ||
19 | * run in it's own thread, one per class instance. | ||
20 | *@ingroup Threading | ||
21 | */ | ||
22 | class Thread | ||
23 | { | ||
24 | public: | ||
25 | /** | ||
26 | * Construct an Thread thread. | ||
27 | */ | ||
28 | Thread(); | ||
29 | |||
30 | /** | ||
31 | * Destroy an Thread thread. | ||
32 | */ | ||
33 | virtual ~Thread(); | ||
34 | |||
35 | /** | ||
36 | * Begin thread execution. This will call the overridden run function, | ||
37 | * which will simply execute in it's own thread until the function | ||
38 | * exits, the thread is killed, or the thread is cancelled (optionally). | ||
39 | * The thread started in this manner has access to all of it's class | ||
40 | * variables, but be sure to protect possible multiple-access with | ||
41 | * ThreadMutex objects. | ||
42 | * @returns True if starting the thread was successful. False if | ||
43 | * something went wrong and the thread has not started. | ||
44 | */ | ||
45 | bool start(); | ||
46 | |||
47 | /** | ||
48 | * Forcibly kill a thread. This is not generally considered a good | ||
49 | * thing to do, but in those rare cases you need it, it's invaluable. | ||
50 | * The problem with stopping (or killing) a thread is that it stops it | ||
51 | * the moment you call stop, no matter what it's doing. The object | ||
52 | * oriented approach to this will help clean up any class variables | ||
53 | * that were used, but anything not managed as a member variable will | ||
54 | * probably create a memory leak type of situation. Instead of stop, | ||
55 | * consider using cancel, which can be handled by the running thread in | ||
56 | * a graceful manner. | ||
57 | *@returns True if the thread was stopped, false otherwise. When this | ||
58 | * function returns the thread may not have stopped, to ensure that the | ||
59 | * thread has really stopped, call join. | ||
60 | */ | ||
61 | bool stop(); | ||
62 | |||
63 | /** | ||
64 | * Join the thread in action. This function performs what is commonly | ||
65 | * called a thread join. That is that it effectively makes the calling | ||
66 | * thread an the Thread thread contained in the called object one in the | ||
67 | * same, and pauses the calling thread until the called thread exits. | ||
68 | * That is, when called from, say, your main(), mythread.join() will | ||
69 | * not return until the thread mythread has exited. This is very handy | ||
70 | * at the end of programs to ensure all of your data was cleaned up. | ||
71 | *@returns True if the thread was joined, false if the thread couldn't | ||
72 | * be joined, usually because it isn't running to begin with. | ||
73 | */ | ||
74 | bool join(); | ||
75 | |||
76 | private: | ||
77 | pthread_t ptHandle; /**< Internal handle to the posix thread. */ | ||
78 | int nHandle; /**< Numeric handle to the posix thread. */ | ||
79 | |||
80 | protected: | ||
81 | /** | ||
82 | * The workhorse of the Thread class. This is the function that will run | ||
83 | * in the thread, when this function exits the thread dies and is | ||
84 | * cleaned up by the system. Make sure to read up on ThreadMutex, | ||
85 | * ThreadCondition, and cancel to see how to control and protect | ||
86 | * everything you do in a safe way within this function. | ||
87 | *@returns I'm not sure right now, but this is the posix standard form. | ||
88 | */ | ||
89 | virtual void run()=0; | ||
90 | |||
91 | /** | ||
92 | * This is the hidden-heard of the thread system. While run is what the | ||
93 | * user gets to override, and everything said about it is true, this is | ||
94 | * the function that actually makes up the thread, it simply calls the | ||
95 | * run member function in an OO-friendly way. This is what allows us to | ||
96 | * use member variables from within the thread itself. | ||
97 | *@param pThread Should always be this. | ||
98 | *@returns This is specified by posix, I'm not sure yet. | ||
99 | */ | ||
100 | static void *threadRunner( void *pThread ); | ||
101 | |||
102 | void yield(); | ||
103 | |||
104 | }; | ||
105 | } | ||
106 | |||
107 | #endif | ||