Qt Reference Documentation

Qt 3 Support Members for QMutex

The following class members are part of the Qt 3 support layer. They are provided to help you port old code to Qt 4. We advise against using them in new code.

Public Functions

QMutex ( bool recursive )
bool locked ()

Member Function Documentation

QMutex::QMutex ( bool recursive )

Use the constructor that takes a RecursionMode parameter instead.

bool QMutex::locked ()

Returns true if the mutex is locked by another thread; otherwise returns false.

It is generally a bad idea to use this function, because code that uses it has a race condition. Use tryLock() and unlock() instead.

For example, if you have code like

 bool isLocked = mutex.locked();

you can rewrite it as

 bool isLocked = true;
 if (mutex.tryLock()) {
     isLocked = false;