task_func in another thread, and waits for it to return or be
cancelled. You can use g_task_propagate_pointer(), etc, afterward
to get the result of
GTaskThreadFunc for more details about how
task_func is handled.
Normally this is used with tasks created with a
callback, but note that even if the task does
have a callback, it will not be invoked when
GTask:completed will be set to
TRUE just before this function returns.
Although GLib currently rate-limits the tasks queued via g_task_run_in_thread_sync(), you should not assume that it will always do this. If you have a very large number of tasks to run, but don’t want them to all run at once, you should only queue a limited number of them at a time.
Available since: 2.36