2 * InspIRCd -- Internet Relay Chat Daemon
4 * Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
5 * Copyright (C) 2008 Craig Edwards <craigedwards@brainbox.cc>
7 * This file is part of InspIRCd. InspIRCd is free software: you can
8 * redistribute it and/or modify it under the terms of the GNU General Public
9 * License as published by the Free Software Foundation, version 2.
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
13 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
26 /** The ThreadEngine class has the responsibility of initialising
27 * Thread derived classes. It does this by creating operating system
28 * level threads which are then associated with the class transparently.
29 * This allows Thread classes to be derived without needing to know how
30 * the OS implements threads. You should ensure that any sections of code
31 * that use threads are threadsafe and do not interact with any other
32 * parts of the code which are NOT known threadsafe! If you really MUST
33 * access non-threadsafe code from a Thread, use the Mutex class to wrap
34 * access to the code carefully.
36 class CoreExport ThreadEngine
39 /** Create a new thread. This takes an already allocated
40 * Thread* pointer and initializes it to use this threading
41 * engine. On failure, this function may throw a CoreException.
42 * @param thread_to_init Pointer to a newly allocated Thread
45 void Start(Thread* thread_to_init);
47 /** Stop a thread gracefully.
48 * First, this function asks the thread to terminate by calling Thread::SetExitFlag().
49 * Next, it waits until the thread terminates (on the operating system level). Finally,
50 * all OS-level resources associated with the thread are released. The Thread instance
51 * passed to the function is NOT freed.
52 * When this function returns, the thread is stopped and you can destroy it or restart it
54 * Stopping a thread that is not running is a bug.
55 * @param thread The thread to stop.
57 void Stop(Thread* thread);
60 class CoreExport ThreadData
66 /** The Mutex class represents a mutex, which can be used to keep threads
67 * properly synchronised. Use mutexes sparingly, as they are a good source
68 * of thread deadlocks etc, and should be avoided except where absolutely
69 * neccessary. Note that the internal behaviour of the mutex varies from OS
70 * to OS depending on the thread engine, for example in windows a Mutex
71 * in InspIRCd uses critical sections, as they are faster and simpler to
74 class CoreExport Mutex
77 pthread_mutex_t putex;
83 pthread_mutex_init(&putex, NULL);
85 /** Enter/enable the mutex lock.
89 pthread_mutex_lock(&putex);
91 /** Leave/disable the mutex lock.
95 pthread_mutex_unlock(&putex);
101 pthread_mutex_destroy(&putex);
105 class ThreadQueueData
107 pthread_mutex_t mutex;
112 pthread_mutex_init(&mutex, NULL);
113 pthread_cond_init(&cond, NULL);
118 pthread_mutex_destroy(&mutex);
119 pthread_cond_destroy(&cond);
124 pthread_mutex_lock(&mutex);
129 pthread_mutex_unlock(&mutex);
134 pthread_cond_signal(&cond);
139 pthread_cond_wait(&cond, &mutex);
143 class ThreadSignalSocket;
144 class ThreadSignalData
147 ThreadSignalSocket* sock;