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/*==LICENSE==*
CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011 Cyan Worlds, Inc.
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 3 of the License, or
(at your option) 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, see <http://www.gnu.org/licenses/>.
Additional permissions under GNU GPL version 3 section 7
If you modify this Program, or any covered work, by linking or
combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK,
NVIDIA PhysX SDK, Microsoft DirectX SDK, OpenSSL library, Independent
JPEG Group JPEG library, Microsoft Windows Media SDK, or Apple QuickTime SDK
(or a modified version of those libraries),
containing parts covered by the terms of the Bink SDK EULA, 3ds Max EULA,
PhysX SDK EULA, DirectX SDK EULA, OpenSSL and SSLeay licenses, IJG
JPEG Library README, Windows Media SDK EULA, or QuickTime SDK EULA, the
licensors of this Program grant you additional
permission to convey the resulting work. Corresponding Source for a
non-source form of such a combination shall include the source code for
the parts of OpenSSL and IJG JPEG Library used as well as that of the covered
work.
You can contact Cyan Worlds, Inc. by email legal@cyan.com
or by snail mail at:
Cyan Worlds, Inc.
14617 N Newport Hwy
Mead, WA 99021
*==LICENSE==*/
#ifndef hsThread_Defined
#define hsThread_Defined
#include "hsTypes.h"
typedef UInt32 hsMilliseconds;
#if HS_BUILD_FOR_WIN32
#include "hsWindows.h"
#elif HS_BUILD_FOR_UNIX
#include <pthread.h>
#include <semaphore.h>
// We can't wait with a timeout with semas
#define USE_SEMA
// Linux kernel 2.4 w/ NTPL threading patch and O(1) scheduler
// seems to have a problem in it's cond_t implementation that
// causes a hang under heavy load. This is a workaround that
// uses select() and pipes.
// #define PSEUDO_EVENT
#endif
class hsThread
{
public:
#if HS_BUILD_FOR_WIN32
typedef DWORD ThreadId;
#elif HS_BUILD_FOR_UNIX
typedef pthread_t ThreadId;
#endif
private:
hsBool fQuit;
UInt32 fStackSize;
#if HS_BUILD_FOR_WIN32
ThreadId fThreadId;
HANDLE fThreadH;
HANDLE fQuitSemaH;
#elif HS_BUILD_FOR_UNIX
ThreadId fPThread;
hsBool fIsValid;
pthread_mutex_t fMutex;
#endif
protected:
hsBool GetQuit() const { return hsBool(fQuit); }
void SetQuit(hsBool value) { fQuit = value; }
public:
hsThread(UInt32 stackSize = 0);
virtual ~hsThread(); // calls Stop()
#if HS_BUILD_FOR_WIN32
ThreadId GetThreadId() { return fThreadId; }
static ThreadId GetMyThreadId() { return GetCurrentThreadId(); }
#elif HS_BUILD_FOR_UNIX
ThreadId GetThreadId() { return fPThread; }
static ThreadId GetMyThreadId() { return pthread_self(); }
pthread_mutex_t* GetStartupMutex() { return &fMutex; }
#endif
virtual hsError Run() = 0; // override this to do your work
virtual void Start(); // initializes stuff and calls your Run() method
virtual void Stop(); // sets fQuit = true and the waits for the thread to stop
// Static functions
static void* Alloc(size_t size); // does not call operator::new(), may return nil
static void Free(void* p); // does not call operator::delete()
static void ThreadYield();
#if HS_BUILD_FOR_WIN32
DWORD WinRun();
#endif
};
//////////////////////////////////////////////////////////////////////////////
class hsMutex {
#if HS_BUILD_FOR_WIN32
HANDLE fMutexH;
#elif HS_BUILD_FOR_UNIX
pthread_mutex_t fPMutex;
#endif
public:
hsMutex();
virtual ~hsMutex();
void Lock();
hsBool TryLock();
void Unlock();
};
class hsTempMutexLock {
hsMutex* fMutex;
public:
hsTempMutexLock(hsMutex* mutex) : fMutex(mutex)
{
fMutex->Lock();
}
hsTempMutexLock(hsMutex& mutex) : fMutex(&mutex)
{
fMutex->Lock();
}
~hsTempMutexLock()
{
fMutex->Unlock();
}
};
//////////////////////////////////////////////////////////////////////////////
class hsSemaphore {
#if HS_BUILD_FOR_WIN32
HANDLE fSemaH;
#elif HS_BUILD_FOR_UNIX
#ifdef USE_SEMA
sem_t fPSema;
#else
pthread_mutex_t fPMutex;
pthread_cond_t fPCond;
Int32 fCounter;
#endif
#endif
public:
#ifdef HS_BUILD_FOR_WIN32
hsSemaphore(int initialValue=0, const char *name=nil);
#else
hsSemaphore(int initialValue=0);
#endif
~hsSemaphore();
hsBool Wait(hsMilliseconds timeToWait = kPosInfinity32);
void Signal();
};
//////////////////////////////////////////////////////////////////////////////
class hsEvent
{
#if HS_BUILD_FOR_UNIX
#ifndef PSEUDO_EVENT
pthread_mutex_t fMutex;
pthread_cond_t fCond;
hsBool fTriggered;
#else
enum { kRead, kWrite };
int fFds[2];
hsMutex fWaitLock;
hsMutex fSignalLock;
#endif // PSEUDO_EVENT
#elif HS_BUILD_FOR_WIN32
HANDLE fEvent;
#endif
public:
hsEvent();
~hsEvent();
hsBool Wait(hsMilliseconds timeToWait = kPosInfinity32);
void Signal();
};
//////////////////////////////////////////////////////////////////////////////
class hsSleep
{
public:
#if HS_BUILD_FOR_UNIX
static void Sleep(UInt32 millis);
#elif HS_BUILD_FOR_WIN32
static void Sleep(UInt32 millis) { ::Sleep(millis); }
#endif
};
//////////////////////////////////////////////////////////////////////////////
// Allows multiple readers, locks out readers for writing.
class hsReaderWriterLock
{
public:
struct Callback
{
virtual void OnLockingForRead( hsReaderWriterLock * lock ) {}
virtual void OnLockedForRead( hsReaderWriterLock * lock ) {}
virtual void OnUnlockingForRead( hsReaderWriterLock * lock ) {}
virtual void OnUnlockedForRead( hsReaderWriterLock * lock ) {}
virtual void OnLockingForWrite( hsReaderWriterLock * lock ) {}
virtual void OnLockedForWrite( hsReaderWriterLock * lock ) {}
virtual void OnUnlockingForWrite( hsReaderWriterLock * lock ) {}
virtual void OnUnlockedForWrite( hsReaderWriterLock * lock ) {}
};
hsReaderWriterLock( const char * name="<unnamed>", Callback * cb=nil );
~hsReaderWriterLock();
void LockForReading();
void UnlockForReading();
void LockForWriting();
void UnlockForWriting();
const char * GetName() const { return fName; }
private:
int fReaderCount;
hsMutex fReaderCountLock;
hsMutex fReaderLock;
hsSemaphore fWriterSema;
Callback * fCallback;
char * fName;
};
class hsLockForReading
{
hsReaderWriterLock * fLock;
public:
hsLockForReading( hsReaderWriterLock & lock ): fLock( &lock )
{
fLock->LockForReading();
}
hsLockForReading( hsReaderWriterLock * lock ): fLock( lock )
{
fLock->LockForReading();
}
~hsLockForReading()
{
fLock->UnlockForReading();
}
};
class hsLockForWriting
{
hsReaderWriterLock * fLock;
public:
hsLockForWriting( hsReaderWriterLock & lock ): fLock( &lock )
{
fLock->LockForWriting();
}
hsLockForWriting( hsReaderWriterLock * lock ): fLock( lock )
{
fLock->LockForWriting();
}
~hsLockForWriting()
{
fLock->UnlockForWriting();
}
};
#endif