diff options
| -rw-r--r-- | src/corelib/thread/qreadwritelock.cpp | 31 |
1 files changed, 25 insertions, 6 deletions
diff --git a/src/corelib/thread/qreadwritelock.cpp b/src/corelib/thread/qreadwritelock.cpp index 32dbdbba0c..ed88db96cd 100644 --- a/src/corelib/thread/qreadwritelock.cpp +++ b/src/corelib/thread/qreadwritelock.cpp @@ -82,7 +82,7 @@ QT_BEGIN_NAMESPACE priority over any readers that might also be waiting. Like QMutex, a QReadWriteLock can be recursively locked by the - same thread when constructed in + same thread when constructed with \l{QReadWriteLock::Recursive} as \l{QReadWriteLock::RecursionMode}. In such cases, unlock() must be called the same number of times lockForWrite() or lockForRead() was called. Note that the lock type cannot be @@ -133,8 +133,10 @@ QReadWriteLock::~QReadWriteLock() /*! Locks the lock for reading. This function will block the current - thread if any thread (including the current) has locked for - writing. + thread if another thread has locked for writing. + + It is not possible to lock for read if the thread already has + locked for write. \sa unlock(), lockForWrite(), tryLockForRead() */ @@ -177,7 +179,10 @@ void QReadWriteLock::lockForRead() writing. If the lock was obtained, the lock must be unlocked with unlock() - before another thread can successfully lock it. + before another thread can successfully lock it for writing. + + It is not possible to lock for read if the thread already has + locked for write. \sa unlock(), lockForRead() */ @@ -222,7 +227,10 @@ bool QReadWriteLock::tryLockForRead() lock can be locked for reading when \a timeout is negative. If the lock was obtained, the lock must be unlocked with unlock() - before another thread can successfully lock it. + before another thread can successfully lock it for writing. + + It is not possible to lock for read if the thread already has + locked for write. \sa unlock(), lockForRead() */ @@ -262,7 +270,12 @@ bool QReadWriteLock::tryLockForRead(int timeout) /*! Locks the lock for writing. This function will block the current - thread if another thread has locked for reading or writing. + thread if another thread (including the current) has locked for + reading or writing (unless the lock has been created using the + \l{QReadWriteLock::Recursive} mode). + + It is not possible to lock for write if the thread already has + locked for read. \sa unlock(), lockForRead(), tryLockForWrite() */ @@ -304,6 +317,9 @@ void QReadWriteLock::lockForWrite() If the lock was obtained, the lock must be unlocked with unlock() before another thread can successfully lock it. + It is not possible to lock for write if the thread already has + locked for read. + \sa unlock(), lockForWrite() */ bool QReadWriteLock::tryLockForWrite() @@ -348,6 +364,9 @@ bool QReadWriteLock::tryLockForWrite() If the lock was obtained, the lock must be unlocked with unlock() before another thread can successfully lock it. + It is not possible to lock for write if the thread already has + locked for read. + \sa unlock(), lockForWrite() */ bool QReadWriteLock::tryLockForWrite(int timeout) |