qsemaphore.cpp File Reference

#include "qsemaphore.h"
#include "qfutex_p.h"
#include "qdeadlinetimer.h"
#include "qdatetime.h"
#include "qdebug.h"
#include "qlocking_p.h"
#include "qwaitcondition_p.h"
#include <chrono>

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Classes
struct	QtSemaphorePrivate::Layout1
struct	QtSemaphorePrivate::Layout2
class	QSemaphorePrivate

Namespaces
namespace	QtSemaphorePrivate

Typedefs
using	QtSemaphorePrivate::Members = std::conditional_t< sizeof(Layout1)<=sizeof(Layout2), Layout1, Layout2 >

Functions
static int	futexAvailCounter (quintptr v)
static bool	futexNeedsWake (quintptr v)
static QBasicAtomicInteger< quint32 > *	futexLow32 (QBasicAtomicInteger< quintptr > *ptr)
static QBasicAtomicInteger< quint32 > *	futexHigh32 (QBasicAtomicInteger< quintptr > *ptr)
template<bool IsTimed>
bool	futexSemaphoreTryAcquire_loop (QBasicAtomicInteger< quintptr > &u, quintptr curValue, quintptr nn, QDeadlineTimer timer)
template<typename T >
bool	futexSemaphoreTryAcquire (QBasicAtomicInteger< quintptr > &u, int n, T timeout)

Variables
static constexpr bool	futexHasWaiterCount = false
static constexpr quintptr	futexNeedsWakeAllBit
static constexpr QDeadlineTimer::ForeverConstant	Expired

Function Documentation

futexAvailCounter()

static int futexAvailCounter ( quintptr  v )

static

Definition at line 105 of file qsemaphore.cpp.

References futexHasWaiterCount, and Q_ASSERT.

Referenced by QSemaphore::available(), futexSemaphoreTryAcquire(), and futexSemaphoreTryAcquire_loop().

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futexHigh32()

static QBasicAtomicInteger< quint32 > * futexHigh32 ( QBasicAtomicInteger< quintptr > *  ptr )

static

Definition at line 137 of file qsemaphore.cpp.

References futexHasWaiterCount, ptr(), and Q_ASSERT.

Referenced by futexSemaphoreTryAcquire(), futexSemaphoreTryAcquire_loop(), and QSemaphore::release().

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futexLow32()

static QBasicAtomicInteger< quint32 > * futexLow32 ( QBasicAtomicInteger< quintptr > *  ptr )

static

Definition at line 128 of file qsemaphore.cpp.

References ptr().

Referenced by futexSemaphoreTryAcquire_loop(), and QSemaphore::release().

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futexNeedsWake()

static bool futexNeedsWake ( quintptr  v )

static

Definition at line 118 of file qsemaphore.cpp.

References futexHasWaiterCount.

Referenced by QSemaphore::release().

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futexSemaphoreTryAcquire()

template<typename T >

bool futexSemaphoreTryAcquire	(	QBasicAtomicInteger< quintptr > &	u,
		int	n,
		T	timeout
	)

Definition at line 195 of file qsemaphore.cpp.

References Expired, QBasicAtomicInteger< T >::fetchAndAddRelaxed(), QBasicAtomicInteger< T >::fetchAndSubRelaxed(), futexAvailCounter(), futexHasWaiterCount, futexHigh32(), QBasicAtomicInteger< T >::loadAcquire(), Q_ASSERT, Q_UINT64_C, qCritical, and QBasicAtomicInteger< T >::testAndSetOrdered().

Referenced by QSemaphore::acquire(), QSemaphore::tryAcquire(), and QSemaphore::tryAcquire().

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futexSemaphoreTryAcquire_loop()

template<bool IsTimed>

bool futexSemaphoreTryAcquire_loop	(	QBasicAtomicInteger< quintptr > &	u,
		quintptr	curValue,
		quintptr	nn,
		QDeadlineTimer	timer
	)

Definition at line 148 of file qsemaphore.cpp.

References QBasicAtomicInteger< T >::fetchAndOrRelaxed(), futexAvailCounter(), futexHasWaiterCount, futexHigh32(), futexLow32(), futexNeedsWakeAllBit, QtFreeBSDFutex::futexWait(), QBasicAtomicInteger< T >::loadAcquire(), ptr(), Q_ASSERT, QBasicAtomicInteger< T >::testAndSetOrdered(), and timer.

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Variable Documentation

Expired

constexpr QDeadlineTimer::ForeverConstant Expired

staticconstexpr

Initial value:

=
        QDeadlineTimer::ForeverConstant(1)

Definition at line 191 of file qsemaphore.cpp.

Referenced by futexSemaphoreTryAcquire(), and QSemaphore::tryAcquire().

futexHasWaiterCount

constexpr bool futexHasWaiterCount = false

staticconstexpr

Definition at line 99 of file qsemaphore.cpp.

Referenced by QSemaphore::QSemaphore(), futexAvailCounter(), futexHigh32(), futexNeedsWake(), futexSemaphoreTryAcquire(), futexSemaphoreTryAcquire_loop(), and QSemaphore::release().

futexNeedsWakeAllBit

constexpr quintptr futexNeedsWakeAllBit

staticconstexpr

Initial value:

= futexHasWaiterCount ?
        (Q_UINT64_C(1) << (sizeof(quintptr) * CHAR_BIT - 1)) : 0x80000000U

Definition at line 102 of file qsemaphore.cpp.

Referenced by futexSemaphoreTryAcquire_loop(), and QSemaphore::release().