QFastMutex Class Reference

Public Functions
void	lock ()
	QFastMutex ()
bool	tryLock ()
void	unlock ()

Properties
QAtomicInt	contenders
QSemaphore	semaphore

Detailed Description

Definition at line 58 of file qregion_qws.cpp.

Constructors and Destructors

QFastMutex()

QFastMutex::QFastMutex ( )

inline

Definition at line 63 of file qregion_qws.cpp.

        : contenders(0), semaphore(0)
    { }

Functions

lock()

void QFastMutex::lock ( )

inline

Definition at line 66 of file qregion_qws.cpp.

Referenced by qt_allocRegionMemory(), and qt_freeRegionMemory().

    {
        if (contenders.fetchAndAddAcquire(1) != 0) {
            semaphore.acquire();
            contenders.deref();
        }
    }

tryLock()

bool QFastMutex::tryLock ( )

inline

Definition at line 73 of file qregion_qws.cpp.

    {
        return contenders.testAndSetAcquire(0, 1);
    }

unlock()

void QFastMutex::unlock ( )

inline

Definition at line 77 of file qregion_qws.cpp.

Referenced by qt_allocRegionMemory(), and qt_freeRegionMemory().

    {
        if (!contenders.testAndSetRelease(1, 0))
            semaphore.release();
    }

Properties

contenders

QAtomicInt QFastMutex::contenders

private

Definition at line 60 of file qregion_qws.cpp.

semaphore

QSemaphore QFastMutex::semaphore

private

Definition at line 61 of file qregion_qws.cpp.

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The documentation for this class was generated from the following file:

• /src/gui/painting/qregion_qws.cpp