/*! \internal
*/
void QThreadPoolPrivate::startThread(QRunnable *runnable)
{
QThreadPoolThread *thread = new QThreadPoolThread(this);
allThreads.insert(thread);
++activeThreads;
if (runnable->autoDelete())
++runnable->ref;
thread->runnable = runnable;
thread->start();
}
bool QThreadPoolPrivate::tryStart(QRunnable *task)
{
if (allThreads.isEmpty()) {
// always create at least one thread
startThread(task);
return true;
}
// can't do anything if we're over the limit
if (activeThreadCount() >= maxThreadCount)
return false;
if (waitingThreads > 0) {
// recycle an available thread
--waitingThreads;
enqueueTask(task);
return true;
}
if (!expiredThreads.isEmpty()) {
// restart an expired thread
QThreadPoolThread *thread = expiredThreads.dequeue();
Q_ASSERT(thread->runnable == 0);
++activeThreads;
if (task->autoDelete())
++task->ref;
thread->runnable = task;
thread->start();
return true;
}
// start a new thread
startThread(task);
return true;
}
