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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
*
* This 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 option) any later version.
*
* This software 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 software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
// -=- Threading_win32.h
// Win32 Threading interface implementation
#ifndef __RFB_THREADING_IMPL_WIN32
#define __RFB_THREADING_IMPL_WIN32
#define __RFB_THREADING_IMPL WIN32
#include <rfb_win32/Handle.h>
#include <rfb/util.h>
#include <rdr/Exception.h>
//#include <stdio.h>
namespace rfb {
class Mutex {
public:
Mutex() {
InitializeCriticalSection(&crit);
}
~Mutex() {
DeleteCriticalSection(&crit);
}
friend class Lock;
friend class Condition;
protected:
void enter() {EnterCriticalSection(&crit);}
void exit() {LeaveCriticalSection(&crit);}
CRITICAL_SECTION crit;
};
class Lock {
public:
Lock(Mutex& m) : mutex(m) {m.enter();}
~Lock() {mutex.exit();}
protected:
Mutex& mutex;
};
enum ThreadState {ThreadCreated, ThreadStarted, ThreadStopped, ThreadJoined, ThreadNative};
class Thread {
public:
Thread(const char* name_=0);
virtual ~Thread();
virtual void run();
virtual void start();
virtual Thread* join();
const char* getName() const;
ThreadState getState() const;
// Determines whether the thread should delete itself when run() returns
// If you set this, you must NEVER call join()!
void setDeleteAfterRun() {deleteAfterRun = true;};
unsigned long getThreadId() const;
static Thread* self();
friend class Condition;
protected:
Thread(HANDLE thread_, DWORD thread_id_);
static DWORD WINAPI threadProc(LPVOID lpParameter);
win32::Handle thread;
DWORD thread_id;
CharArray name;
ThreadState state;
Condition* sig;
Mutex mutex;
win32::Handle cond_event;
Thread* cond_next;
bool deleteAfterRun;
};
class Condition {
public:
Condition(Mutex& m) : mutex(m), waiting(0) {
}
~Condition() {
}
// Wake up the specified number of threads that are waiting
// on this Condition, or all of them if -1 is specified.
void signal(int howMany=1) {
Lock l(cond_lock);
while (waiting && howMany!=0) {
SetEvent(waiting->cond_event);
waiting = waiting->cond_next;
if (howMany>0) --howMany;
}
}
// NB: Must hold "mutex" to call wait()
// Wait until either the Condition is signalled or the timeout
// expires.
void wait(DWORD timeout=INFINITE) {
Thread* self = Thread::self();
ResetEvent(self->cond_event);
{ Lock l(cond_lock);
self->cond_next = waiting;
waiting = self;
}
mutex.exit();
DWORD result = WaitForSingleObject(self->cond_event, timeout);
mutex.enter();
if (result == WAIT_TIMEOUT) {
Lock l(cond_lock);
// Remove this thread from the Condition
for (Thread** removeFrom = &waiting; *removeFrom; removeFrom = &(*removeFrom)->cond_next) {
if (*removeFrom == self) {
*removeFrom = self->cond_next;
break;
}
}
} else if (result == WAIT_FAILED) {
throw rdr::SystemException("failed to wait on Condition", GetLastError());
}
}
protected:
Mutex& mutex;
Mutex cond_lock;
Thread* waiting;
};
};
#endif // __RFB_THREADING_IMPL
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