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SyncUtil.h
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SyncUtil.h
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#pragma once
namespace Util {
class SyncObj {
public:
enum {
Infinte = INFINITE
};
virtual ~SyncObj()
{
}
virtual void lock() const = 0;
virtual void unlock() const = 0;
virtual bool lockEx(unsigned long timeo)
{
assert(false);
return false;
}
};
class Autolock {
public:
Autolock(const SyncObj& sync): _sync(sync)
{
sync.lock();
}
~Autolock()
{
_sync.unlock();
}
const SyncObj& _sync;
};
class LightLock: public SyncObj {
public:
LightLock()
{
InitializeCriticalSection(&_cs);
}
virtual ~LightLock()
{
DeleteCriticalSection(&_cs);
}
virtual void lock() const
{
EnterCriticalSection(&_cs);
}
virtual void unlock() const
{
LeaveCriticalSection(&_cs);
}
virtual bool lockEx(unsigned long timeo)
{
if (timeo == Infinte) {
EnterCriticalSection(&_cs);
return true;
} else {
return TryEnterCriticalSection(&_cs) == TRUE;
}
}
protected:
mutable CRITICAL_SECTION _cs;
};
/*
class RWLock: protected LightLock {
public:
class RLock: public SyncObj {
public:
RLock(const RWLock& rwlock): _rwlock(rwlock)
{
}
virtual void lock() const
{
_rwlock.lockread();
}
virtual void unlock() const
{
_rwlock.unlockread();
}
protected:
const RWLock& _rwlock;
};
class WLock: public SyncObj {
public:
WLock(const RWLock& rwlock): _rwlock(rwlock)
{
}
virtual void lock() const
{
_rwlock.lockwrite();
}
virtual void unlock() const
{
_rwlock.unlockwrite();
}
protected:
const RWLock& _rwlock;
};
RWLock(): _rlock(*this), _wlock(*this)
{
_datalock = CreateSemaphore(NULL, 1, 1, NULL);
_rlockCount = NULL;
}
virtual ~RWLock()
{
CloseHandle(_datalock);
}
const WLock& wlock() const
{
return _wlock;
}
const RLock& rlock() const
{
return _rlock;
}
void lockread() const
{
lock();
if (_rlockCount == 0)
WaitForSingleObject(_datalock, INFINITE);
_rlockCount ++;
unlock();
}
void unlockread() const
{
lock();
if (_rlockCount > 0) {
_rlockCount --;
if (_rlockCount == 0) {
BOOL r = ReleaseSemaphore(_datalock, 1, NULL);
assert(r);
}
}
unlock();
}
void lockwrite() const
{
WaitForSingleObject(_datalock, INFINITE);
}
void unlockwrite() const
{
BOOL r = ReleaseSemaphore(_datalock, 1, NULL);
assert(r);
}
friend class RWLock::RLock;
friend class RWLock::WLock;
protected:
mutable RLock _rlock;
mutable WLock _wlock;
mutable long _rlockCount;
mutable HANDLE _datalock;
};
*/
} // napespace GsUtil {