AuroraMiddleware/qt5base-lts
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Remove superfluous ReleaseSemaphore/WFSO calls

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Factor out the dispatching of IO results into a separate function.
Do not increment the semaphore count in waitForAnyNotified just to
decrement it again in _q_notified.

Change-Id: I7d4a04b679bb152ab3a5025513f885aee276d086
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
This commit is contained in:
Joerg Bornemann 2015-12-18 16:10:13 +01:00
parent 55eaf11bb7
commit 7cde1c029e
2 changed files with 16 additions and 13 deletions
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27
src/corelib/io/qwinoverlappedionotifier.cpp
View File

@ -102,7 +102,8 @@ public:
OVERLAPPED *waitForAnyNotified(int msecs);
void notify(DWORD numberOfBytes, DWORD errorCode, OVERLAPPED *overlapped);
OVERLAPPED *_q_notified();
void _q_notified();
OVERLAPPED *dispatchNextIoResult();
static QWinIoCompletionPort *iocp;
static HANDLE iocpInstanceLock;
@ -302,8 +303,7 @@ OVERLAPPED *QWinOverlappedIoNotifierPrivate::waitForAnyNotified(int msecs)
const DWORD wfso = WaitForSingleObject(hSemaphore, msecs == -1 ? INFINITE : DWORD(msecs));
switch (wfso) {
case WAIT_OBJECT_0:
ReleaseSemaphore(hSemaphore, 1, NULL);
return _q_notified();
return dispatchNextIoResult();
case WAIT_TIMEOUT:
return 0;
default:
@ -385,17 +385,20 @@ void QWinOverlappedIoNotifierPrivate::notify(DWORD numberOfBytes, DWORD errorCod
emit q->_q_notify();
}
OVERLAPPED *QWinOverlappedIoNotifierPrivate::_q_notified()
void QWinOverlappedIoNotifierPrivate::_q_notified()
{
if (WaitForSingleObject(hSemaphore, 0) == WAIT_OBJECT_0)
dispatchNextIoResult();
}
OVERLAPPED *QWinOverlappedIoNotifierPrivate::dispatchNextIoResult()
{
Q_Q(QWinOverlappedIoNotifier);
if (WaitForSingleObject(hSemaphore, 0) == WAIT_OBJECT_0) {
WaitForSingleObject(hResultsMutex, INFINITE);
IOResult ioresult = results.dequeue();
ReleaseMutex(hResultsMutex);
emit q->notified(ioresult.numberOfBytes, ioresult.errorCode, ioresult.overlapped);
return ioresult.overlapped;
}
return 0;
WaitForSingleObject(hResultsMutex, INFINITE);
IOResult ioresult = results.dequeue();
ReleaseMutex(hResultsMutex);
emit q->notified(ioresult.numberOfBytes, ioresult.errorCode, ioresult.overlapped);
return ioresult.overlapped;
}
QT_END_NAMESPACE

2
src/corelib/io/qwinoverlappedionotifier_p.h
View File

@ -58,7 +58,7 @@ class Q_CORE_EXPORT QWinOverlappedIoNotifier : public QObject
Q_OBJECT
Q_DISABLE_COPY(QWinOverlappedIoNotifier)
Q_DECLARE_PRIVATE(QWinOverlappedIoNotifier)
Q_PRIVATE_SLOT(d_func(), OVERLAPPED *_q_notified())
Q_PRIVATE_SLOT(d_func(), void _q_notified())
friend class QWinIoCompletionPort;
public:
QWinOverlappedIoNotifier(QObject *parent = 0);