Constructs a thread pool with the given parent.

Destroys the QThreadPool. This blocks until all runnables have been completed.

Removes the specified runnable from the queue if it has not started. Any runnable which is set to QRunnable::autoDelete() will be deleted and never run.

See also

start()

Removes the runnables which have not started yet. Any runnable which is set to QRunnable::autoDelete() will be deleted and never run.

See also

start()

Returns the global QThreadPool instance.

Releases a thread previously reserved by a call to reserveThread().

Note

Calling this function without previously reserving a thread temporarily increases maxThreadCount(). This is useful when a thread goes to sleep waiting for more work, allowing other threads to continue. Be sure to call reserveThread() when done waiting, so that the thread pool can correctly maintain the activeThreadCount().

See also

reserveThread()

Reserves one thread, disregarding activeThreadCount() and maxThreadCount(). Once you are done with the thread, call releaseThread() to allow it to be reused.

This methods will always increase the number of active threads. This means that by using this function, it is possible for activeThreadCount() to return a value greater than maxThreadCount() .

See also

releaseThread()

Sets the value of the property to expiryTimeout.

Sets the value of the property to maxThreadCount.

Reserves a thread and uses it to run runnable, unless this thread will make the current thread count exceed maxThreadCount(). In that case, runnable is added to a run queue instead. The priority argument can be used to control the run queue's order of execution.

The thread pool takes ownership of the runnable if runnable->autoDelete() returns true, and the runnable will be deleted automatically by the thread pool after the runnable->run() returns. If runnable->autoDelete() returns false, ownership of runnable remains with the caller.Changing the auto-deletion on runnable after calling this functions results in undefined behavior.

Attempts to reserve a thread to run runnable.

If no threads are available at the time of calling, then this function does nothing and returns false. Otherwise, runnable is run immediately using one available thread and this function returns true.

The thread pool takes ownership of the runnable if runnable->autoDelete() returns true, and the runnable will be deleted automatically by the thread pool after the runnable->run() returns. If runnable->autoDelete() returns false, ownership of runnable remains with the caller. Changing the auto-deletion on runnable after calling this function results in undefined behavior.

Waits up to msecs milliseconds for all threads to exit and removes all threads from the thread pool. Returns true if all threads were removed, otherwise it returns false.

This property represents the number of active threads in the thread pool. It is possible for this property to return a value that is greater than maxThreadCount(). Refer to reserveThread() for more details.

See also

reserveThread(), releaseThread()

Threads that are unused for expiryTimeout milliseconds are considered to have expired and will exit. Such threads will be restarted as needed. The default expiryTimeout is 30000 milliseconds (30 seconds). If expiryTimeout is negative, newly created threads will not expire, e.g., they will not exit until the thread pool is destroyed.

Setting expiryTimeout has no effect on already running threads. Only newly created threads will use the new expiryTimeout. We recommend setting the expiryTimeout immediately after creating the thread pool, but before calling start().

This property represents the maximum number of threads used by the thread pool. The thread pool will always use at least 1 thread, even if maxThreadCount limit is zero or negative.

The default maxThreadCount is QThread::idealThreadCount().