QThread Class Reference |
Constant | Value | Description |
---|---|---|
QThread::IdlePriority | 0 | scheduled only when no other threads are running. |
QThread::LowestPriority | 1 | scheduled less often than LowPriority. |
QThread::LowPriority | 2 | scheduled less often than NormalPriority. |
QThread::NormalPriority | 3 | the default priority of the operating system. |
QThread::HighPriority | 4 | scheduled more often than NormalPriority. |
QThread::HighestPriority | 5 | scheduled more often than HighPriority. |
QThread::TimeCriticalPriority | 6 | scheduled as often as possible. |
QThread::InheritPriority | 7 | use the same priority as the creating thread. This is the default. |
Constructs a new thread with the given parent. The thread does not begin executing until start() is called.
See also start().
Destroys the thread.
Note that deleting a QThread object will not stop the execution of the thread it represents. Deleting a running QThread (i.e. isFinished() returns false) will probably result in a program crash. You can wait() on a thread to make sure that it has finished.
Returns a pointer to a QThread which represents the currently executing thread.
Returns the thread handle of the currently executing thread.
Warning: The handle returned by this function is used for internal purposes and should not be used in any application code. On Windows, the returned value is a pseudo-handle for the current thread that cannot be used for numerical comparison.
Enters the event loop and waits until exit() is called, returning the value that was passed to exit(). The value returned is 0 if exit() is called via quit().
It is necessary to call this function to start event handling.
Tells the thread's event loop to exit with a return code.
After calling this function, the thread leaves the event loop and returns from the call to QEventLoop::exec(). The QEventLoop::exec() function returns returnCode.
By convention, a returnCode of 0 means success, any non-zero value indicates an error.
Note that unlike the C library function of the same name, this function does return to the caller -- it is event processing that stops.
This function does nothing if the thread does not have an event loop.
See also quit() and QEventLoop.
This signal is emitted when the thread has finished executing.
See also started() and terminated().
Returns the ideal number of threads that can be run on the system. This is done querying the number of processor cores, both real and logical, in the system. This function returns -1 if the number of processor cores could not be detected.
Returns true if the thread is finished; otherwise returns false.
See also isRunning().
Returns true if the thread is running; otherwise returns false.
See also isFinished().
Causes the current thread to sleep for msecs milliseconds.
See also sleep() and usleep().
Returns the priority for a running thread. If the thread is not running, this function returns InheritPriority.
This function was introduced in Qt 4.1.
See also Priority, setPriority(), and start().
Tells the thread's event loop to exit with return code 0 (success). Equivalent to calling QThread::exit(0).
This function does nothing if the thread does not have an event loop.
See also exit() and QEventLoop.
The starting point for the thread. After calling start(), the newly created thread calls this function. The default implementation simply calls exec().
You can reimplemented this function to do other useful work. Returning from this method will end the execution of the thread.
This function sets the priority for a running thread. If the thread is not running, this function does nothing and returns immediately. Use start() to start a thread with a specific priority.
The priority argument can be any value in the QThread::Priority enum except for InheritPriorty.
This function was introduced in Qt 4.1.
See also Priority, priority(), and start().
Sets the maximum stack size for the thread to stackSize. If stackSize is greater than zero, the maximum stack size is set to stackSize bytes, otherwise the maximum stack size is automatically determined by the operating system.
Warning: Most operating systems place minimum and maximum limits on thread stack sizes. The thread will fail to start if the stack size is outside these limits.
See also stackSize().
Enables or disables termination of the current thread based on the enabled parameter. The thread must have been started by QThread.
When enabled is false, termination is disabled. Future calls to QThread::terminate() will return immediately without effect. Instead, the termination is deferred until termination is enabled.
When enabled is true, termination is enabled. Future calls to QThread::terminate() will terminate the thread normally. If termination has been deferred (i.e. QThread::terminate() was called with termination disabled), this function will terminate the calling thread immediately. Note that this function will not return in this case.
See also terminate().
Forces the current thread to sleep for secs seconds.
See also msleep() and usleep().
Returns the maximum stack size for the thread (if set with setStackSize()); otherwise returns zero.
See also setStackSize().
Begins execution of the thread by calling run(), which should be reimplemented in a QThread subclass to contain your code. The operating system will schedule the thread according to the priority parameter. If the thread is already running, this function does nothing.
See also run() and terminate().
This signal is emitted when the thread starts executing.
See also finished() and terminated().
Terminates the execution of the thread. The thread may or may not be terminated immediately, depending on the operating systems scheduling policies. Use QThread::wait() after terminate() for synchronous termination.
When the thread is terminated, all threads waiting for the thread to finish will be woken up.
Warning: This function is dangerous and its use is discouraged. The thread can be terminate at any point in its code path. Threads can be terminated while modifying data. There is no chance for the thread to cleanup after itself, unlock any held mutexes, etc. In short, use this function only if absolutely necessary.
Termination can be explicitly enabled or disabled by calling QThread::setTerminationEnabled(). Calling this function while termination is disabled results in the termination being deferred, until termination is re-enabled. See the documentation of QThread::setTerminationEnabled() for more information.
See also setTerminationEnabled().
This signal is emitted when the thread is terminated.
See also started() and finished().
Causes the current thread to sleep for usecs microseconds.
See also sleep() and msleep().
Blocks the thread until either of these conditions is met:
This provides similar functionality to the POSIX pthread_join() function.
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