#ifndef _KVI_THREAD_H_
#define _KVI_THREAD_H_
//
//   File : kvi_thread.h
//   Creation date : Mon May 17 1999 04:26:41 CEST by Szymon Stefanek
//
//   This file is part of the KVirc irc client distribution
//   Copyright (C) 1999-2000 Szymon Stefanek (stefanek@tin.it)
//
//   This program 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; either version 2
//   of the License, or (at your opinion) any later version.
//
//   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, write to the Free Software Foundation,
//   Inc. ,59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//

#include "kvi_settings.h"
#include "kvi_string.h"

#include <qnamespace.h>
#include <qobject.h>
#include <qsocketnotifier.h>
#include "kvi_list.h"
#include <qevent.h>


//
// Simple thread implementation
// This is enough for KVIrc needs
// HANDLE WITH CARE
//


// Portability stuff

#ifdef COMPILE_ON_WINDOWS

	#include <winsock2.h> // this will pull in windows.h and will avoid windock.h inclusion
	//#include <windows.h>
	// Windoze thread abstraction layer
	#define kvi_mutex_t HANDLE
	inline void kvi_threadMutexInit(kvi_mutex_t * _pMutex_t)
	{
		*_pMutex_t = CreateMutex(0,0,NULL);
	}
	#define kvi_threadMutexLock(_pMutex_t) WaitForSingleObject(*_pMutex_t,INFINITE)
	#define kvi_threadMutexUnlock(_pMutex_t) ReleaseMutex(*_pMutex_t)
	#define kvi_threadMutexDestroy(_pMutex_t) CloseHandle(*_pMutex_t)
	inline bool kvi_threadMutexTryLock(kvi_mutex_t *_pMutex_t)
	{
		return (WaitForSingleObject(*_pMutex_t,0) == WAIT_OBJECT_0);
	}

	#define kvi_thread_t HANDLE

	inline bool kvi_threadCreate(kvi_thread_t *t,LPTHREAD_START_ROUTINE start_routine,void * arg)
	{
		DWORD dwThreadId;
		*t = CreateThread(NULL,0,start_routine,arg,0,&dwThreadId);
		return (*t != NULL);
	}

	#define kvi_threadExit() ExitThread(0)

#else
	#ifdef COMPILE_THREADS_USE_POSIX
		// Glibc pthread implementation

		#include <pthread.h>
		#include <errno.h> // for EBUSY
	
		// Mutex stuff
		#define kvi_mutex_t pthread_mutex_t
		#define kvi_threadMutexInit(_pMutex_t) pthread_mutex_init(_pMutex_t,0)
		#define kvi_threadMutexLock(_pMutex_t) pthread_mutex_lock(_pMutex_t)
		#define kvi_threadMutexUnlock(_pMutex_t) pthread_mutex_unlock(_pMutex_t)
		#define kvi_threadMutexDestroy(_pMutex_t) pthread_mutex_destroy(_pMutex_t)
		inline bool kvi_threadMutexTryLock(kvi_mutex_t *_pMutex_t)
		{
			return (pthread_mutex_trylock(_pMutex_t) != EBUSY);
		}
		// Actually unused
		// #define kvi_threadMutexTryLock(_pMutex_t) pthread_mutex_trylock(_pMutex_t)
	
		// Thread stuff
		#define kvi_thread_t pthread_t
	
		inline bool kvi_threadCreate(kvi_thread_t *t,void * (*start_routine)(void *),void * arg)
		{
			pthread_attr_t a;
			pthread_attr_init(&a);
			pthread_attr_setinheritsched(&a,PTHREAD_INHERIT_SCHED);
			pthread_attr_setdetachstate(&a,PTHREAD_CREATE_DETACHED);
	
			int ret = pthread_create(t,&a,start_routine,arg);
	
			pthread_attr_destroy(&a);
			return (ret == 0);
		}
	
		// We don't care about exit codes at all
		#define kvi_threadExit() pthread_exit(0)
	#else
		#ifdef COMPILE_THREADS_USE_SOLARIS_LIBTHREAD
			// Native solaris implementation
			#include <thread.h>
			#include <synch.h>
			#include <errno.h>

			// Mutex stuff
			#define kvi_mutex_t mutex_t
			#define kvi_threadMutexInit(_pMutex_t) mutex_init(_pMutex_t,0,0)
			#define kvi_threadMutexLock(_pMutex_t) mutex_lock(_pMutex_t)
			#define kvi_threadMutexUnlock(_pMutex_t) mutex_unlock(_pMutex_t)
			#define kvi_threadMutexDestroy(_pMutex_t) mutex_destroy(_pMutex_t)
			inline bool kvi_threadMutexTryLock(kvi_mutex_t *_pMutex_t)
			{
				return (mutex_trylock(_pMutex_t) != EBUSY);
			};
			// Actually unused
			// #define kvi_threadMutexTryLock(_pMutex_t) mutex_trylock(_pMutex_t)
	
			// Thread stuff
			#define kvi_thread_t thread_t
	
			inline bool kvi_threadCreate(kvi_thread_t *t,void * (*start_routine)(void *),void *arg)
			{
				return (thr_create(0,0,start_routine,arg,THR_DETACHED,t) == 0);
			}
	
			// We don't care about exit codes at all
			#define kvi_threadExit() thr_exit(0)
		#else
// FIXME: 			#warning "Missing a decent thread implementation: we're going to fail , sorry!"
		#endif
	#endif
#endif	
	
class KVILIB_API KviMutex
{
private:
	kvi_mutex_t m_mutex;
#ifdef COMPILE_ON_WINDOWS
	bool        m_bLocked;
#endif
public:
	KviMutex(){ kvi_threadMutexInit(&m_mutex); };
	virtual ~KviMutex(){ kvi_threadMutexDestroy(&m_mutex); };
public:
#ifdef COMPILE_ON_WINDOWS
	void lock(){ kvi_threadMutexLock(&m_mutex); m_bLocked = true; };
	void unlock(){ m_bLocked = false; kvi_threadMutexUnlock(&m_mutex); };
	bool locked(){ return m_bLocked; };
#else
	void lock(){ kvi_threadMutexLock(&m_mutex); };
	void unlock(){ kvi_threadMutexUnlock(&m_mutex); };
	bool locked();
#endif
};


// simple thread class implementation
// this is also called "Blind" thread class

class KVILIB_API KviThread
{
public:
	KviThread();
	virtual ~KviThread();
private:
	kvi_thread_t    m_thread;
	bool            m_bRunning;
	bool            m_bStartingUp;
	KviMutex      * m_pRunningMutex;
	KviPtrList<QEvent> * m_pLocalEventQueue;
public:
	// public KviThread interface
	// HANDLE WITH CARE

	// Runs the thread...call only from external threads!!! :)
	// This function returns true if the child thread has been succesfully created
	// this des not mean that run() is being already executed...
	// isStartingUp() will return true from this moment until
	// the child thread jumps into run() where it will be set to running state (isRunning() == true)
	// and removed from startingUp state.
	bool start();
	// Returns the state of the thread...safe to call from anywhere
	bool isRunning();
	// Returns the state of the thread...safe to call from anywhere
	bool isStartingUp(); // start() called , but not in run() yet...
	// Waits for the termination of this thread: call only from external threads!!! :)
	void wait();
	// DO NOT TOUCH THIS ONE!
	void internalThreadRun_doNotTouchThis();
protected:
	// protected KviThread interface
	// HANDLE WITH CARE TOO!

	// Reimplement this with your job
	virtual void run(){};
	// Terminates the execution of the calling thread
	void exit();
	// The tricky part: threadsafe event dispatching
	// Slave thread -> main thread objects
	void postEvent(QObject *o,QEvent *e);

	// QThread compatibility (we care about this actually ?)
	void sleep(unsigned long sec);
	void msleep(unsigned long msec);
	void usleep(unsigned long usec);
private:
	void setRunning(bool bRunning);
	void setStartingUp(bool bStartingUp);
};

// QEvent::Type for Thread events
#define KVI_THREAD_EVENT (((int)QEvent::User) + 2000)

// CONSTANTS FOR KviThreadEvent::eventId();

///////////////////////////////////////////////////////////////
// extern -> slave thread

// Your reimplementation of KviSensitiveThread MUST handle this
// and exit when this event is received

// Terminate is a plain KviThreadEvent
#define KVI_THREAD_EVENT_TERMINATE 0

///////////////////////////////////////////////////////////////
// slave thread -> master object

// The following standard events are sent from the thread to the master object

// The following are plain KviThreadEvent objects
#define KVI_THREAD_EVENT_SUCCESS 100

// The following are KviThreadDataEvent<int>
#define KVI_THREAD_EVENT_STATECHANGE 150

// The following are KviThreadDataEvent<KviStr>
#define KVI_THREAD_EVENT_MESSAGE 200
#define KVI_THREAD_EVENT_WARNING 201
#define KVI_THREAD_EVENT_ERROR 202
#define KVI_THREAD_EVENT_DATA 203


// The user events
#define KVI_THREAD_USER_EVENT_BASE 1000

// #warning "Get rid of the m_szMessage member of KviThreadEvent : eventual data should be passed with a KviThreadDataEvent"

// Base class for all thread events
class KVILIB_API KviThreadEvent : public QEvent
{
protected:
	int         m_eventId;
	KviThread * m_pSender;
public:
	KviThreadEvent(int evId,KviThread * sender = 0)
		: QEvent((QEvent::Type)KVI_THREAD_EVENT) , m_eventId(evId) , m_pSender(sender) {};
	virtual ~KviThreadEvent(){};
public:
	// This is the sender of the event
	// WARNING : this MAY be null , threads CAN send anonymous events
	KviThread * sender(){ return m_pSender; };
	int id(){ return m_eventId; };
};

template<class TData> class KviThreadDataEvent : public KviThreadEvent
{
protected:
	TData * m_pData;
public:
	KviThreadDataEvent(int evId,TData * pData = 0,KviThread * sender = 0)
		: KviThreadEvent(evId,sender){ m_pData = pData; };
	virtual ~KviThreadDataEvent(){ if(m_pData)delete m_pData; };
public:
	void setData(TData * d){ if(m_pData)delete m_pData; m_pData = d; };
	TData * getData(){ TData * aux = m_pData; m_pData = 0; return aux; };
	TData * data(){ return m_pData; };
};

// A thread that has also an internal event queue
// so events can be posted from the master side to the slave one
// Reimplementations of this class should periodically check
// dequeueEvent() and eventually process the incoming events (and then DELETE it)

// KVI_THREAD_EVENT_TERMINATE should be always handled by the reimplementation
// and it should always exit (cleanly) when this event is received


class KVILIB_API KviSensitiveThread : public KviThread
{
public:
	KviSensitiveThread();
	virtual ~KviSensitiveThread();
protected:
	KviMutex              * m_pLocalEventQueueMutex;
	KviPtrList<KviThreadEvent> * m_pLocalEventQueue;
public:
	// enqueues an event directed to THIS thread
	// the event must be allocated with NEW and
	// will be destroyed on the slave side
	void enqueueEvent(KviThreadEvent *e);
	// enqueues a terminate event and waits() for the slave thread
	// the slave thread MUST handle KVI_THREAD_EVENT_TERMINATE
	void terminate();
protected:
	// slave side:
	// returns the first event in the local queue
	// the event MUST BE DELETED after processing
	KviThreadEvent * dequeueEvent();
};

// =============================================================================================//
// This is private stuff...only KviThread and KviApp may use it
// and may call only specific functions...don't touch.

typedef struct _KviThreadPendingEvent
{
	QObject *o;
	QEvent *e;
} KviThreadPendingEvent;

class KVILIB_API KviThreadManager : public QObject
{
	friend class KviApp;
	friend class KviThread;
	Q_OBJECT
protected:
	// These should be private...but we don't want anyone to complain
	// Treat as private plz.
	KviThreadManager();
	~KviThreadManager();
public:
	static void killPendingEvents(QObject * receiver);
private:
#ifndef COMPILE_ON_WINDOWS
	QSocketNotifier * m_pSn;
#endif
	KviMutex * m_pMutex; // This class performs only atomic operations
	KviPtrList<KviThread> * m_pThreadList;
#ifndef COMPILE_ON_WINDOWS
	KviPtrList<KviThreadPendingEvent> * m_pEventQueue;
	int m_fd[2];
#endif
protected:
	// Public to KviThread only
	void registerSlaveThread(KviThread *t);
	void unregisterSlaveThread(KviThread *t);

	void postSlaveEvent(QObject *o,QEvent *e);
	void killPendingEventsByReceiver(QObject * receiver);
	// Public to KviApp only
	static void globalInit();
	static void globalDestroy();
private slots:
	void eventsPending(int fd);
};


#endif //!_KVI_THREAD_H_
