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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2014 Attila Molnar <attilamolnar@hush.com>
* Copyright (C) 2013 Sadie Powell <sadie@witchery.services>
* Copyright (C) 2012 Robby <robby@chatbelgie.be>
* Copyright (C) 2012 ChrisTX <xpipe@hotmail.de>
* Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2008-2010 Craig Edwards <brain@inspircd.org>
*
* This file is part of InspIRCd. InspIRCd is free software: you can
* redistribute it and/or modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation, version 2.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include "base.h"
class Thread;
/** The ThreadEngine class has the responsibility of initialising
* Thread derived classes. It does this by creating operating system
* level threads which are then associated with the class transparently.
* This allows Thread classes to be derived without needing to know how
* the OS implements threads. You should ensure that any sections of code
* that use threads are threadsafe and do not interact with any other
* parts of the code which are NOT known threadsafe! If you really MUST
* access non-threadsafe code from a Thread, use the Mutex class to wrap
* access to the code carefully.
*/
class CoreExport ThreadEngine
{
public:
/** Per-thread state, present in each Thread object, managed by the ThreadEngine
*/
struct ThreadState
{
HANDLE handle;
};
static DWORD WINAPI Entry(void* parameter);
/** Create a new thread. This takes an already allocated
* Thread* pointer and initializes it to use this threading
* engine. On failure, this function may throw a CoreException.
* @param thread_to_init Pointer to a newly allocated Thread
* derived object.
*/
void Start(Thread* thread_to_init);
/** Stop a thread gracefully.
* First, this function asks the thread to terminate by calling Thread::SetExitFlag().
* Next, it waits until the thread terminates (on the operating system level). Finally,
* all OS-level resources associated with the thread are released. The Thread instance
* passed to the function is NOT freed.
* When this function returns, the thread is stopped and you can destroy it or restart it
* at a later point.
* Stopping a thread that is not running is a bug.
* @param thread The thread to stop.
*/
void Stop(Thread* thread);
};
/** The Mutex class represents a mutex, which can be used to keep threads
* properly synchronised. Use mutexes sparingly, as they are a good source
* of thread deadlocks etc, and should be avoided except where absolutely
* necessary. Note that the internal behaviour of the mutex varies from OS
* to OS depending on the thread engine, for example in windows a Mutex
* in InspIRCd uses critical sections, as they are faster and simpler to
* manage.
*/
class CoreExport Mutex
{
private:
CRITICAL_SECTION wutex;
public:
Mutex()
{
InitializeCriticalSection(&wutex);
}
void Lock()
{
EnterCriticalSection(&wutex);
}
void Unlock()
{
LeaveCriticalSection(&wutex);
}
~Mutex()
{
DeleteCriticalSection(&wutex);
}
};
class ThreadQueueData : public Mutex
{
HANDLE event;
public:
ThreadQueueData()
{
event = CreateEvent(NULL, false, false, NULL);
if (event == NULL)
throw CoreException("CreateEvent() failed in ThreadQueueData::ThreadQueueData()!");
}
~ThreadQueueData()
{
CloseHandle(event);
}
void Wakeup()
{
PulseEvent(event);
}
void Wait()
{
Unlock();
WaitForSingleObject(event, INFINITE);
Lock();
}
};
class ThreadSignalData
{
public:
int connFD;
ThreadSignalData()
{
connFD = -1;
}
};
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