1 /****************************************************************************

     1 /****************************************************************************

     2 **

     2 **

     4 ** All rights reserved.

     4 ** All rights reserved.

     5 ** Contact: Nokia Corporation (qt-info@nokia.com)

     5 ** Contact: Nokia Corporation (qt-info@nokia.com)

     6 **

     6 **

     7 ** This file is part of the QtCore module of the Qt Toolkit.

     7 ** This file is part of the QtCore module of the Qt Toolkit.

     8 **

     8 **

    80     writer and another writer comes in, that writer will have

    80     writer and another writer comes in, that writer will have

    81     priority over any readers that might also be waiting.

    81     priority over any readers that might also be waiting.

    82 

    82 

    83     Like QMutex, a QReadWriteLock can be recursively locked by the

    83     Like QMutex, a QReadWriteLock can be recursively locked by the

    84     same thread when constructed in

    84     same thread when constructed in

    86     unlock() must be called the same number of times lockForWrite() or

    86     unlock() must be called the same number of times lockForWrite() or

    87     lockForRead() was called. Note that the lock type cannot be

    87     lockForRead() was called. Note that the lock type cannot be

    88     changed when trying to lock recursively, i.e. it is not possible

    88     changed when trying to lock recursively, i.e. it is not possible

    89     to lock for reading in a thread that already has locked for

    89     to lock for reading in a thread that already has locked for

    90     writing (and vice versa).

    90     writing (and vice versa).

   264     Q_ASSERT_X(d->accessCount > 0, "QReadWriteLock::tryLockForRead()", "Overflow in lock counter");

   264     Q_ASSERT_X(d->accessCount > 0, "QReadWriteLock::tryLockForRead()", "Overflow in lock counter");

   265 

   265 

   266     return true;

   266     return true;

   267 }

   267 }

   268 

   268 

   270     Locks the lock for writing. This function will block the current

   270     Locks the lock for writing. This function will block the current

   271     thread if another thread has locked for reading or writing.

   271     thread if another thread has locked for reading or writing.

   272 

   272 

   273     \sa unlock() lockForRead() tryLockForWrite()

   273     \sa unlock() lockForRead() tryLockForWrite()

   275 void QReadWriteLock::lockForWrite()

   275 void QReadWriteLock::lockForWrite()

   276 {

   276 {

   277     QMutexLocker lock(&d->mutex);

   277     QMutexLocker lock(&d->mutex);

   278 

   278 

   279     Qt::HANDLE self = 0;

   279     Qt::HANDLE self = 0;