Sets or clears @task's return-on-cancel flag. This is only
meaningful for tasks run via g_task_run_in_thread() or
g_task_run_in_thread_sync().
If @return_on_cancel is %TRUE, then cancelling @task's
#GCancellable will immediately cause it to return, as though the
task's #GTaskThreadFunc had called
g_task_return_error_if_cancelled() and then returned.
This allows you to create a cancellable wrapper around an
uninterruptible function. The #GTaskThreadFunc just needs to be
careful that it does not modify any externally-visible state after
it has been cancelled. To do that, the thread should call
g_task_set_return_on_cancel() again to (atomically) set
return-on-cancel %FALSE before making externally-visible changes;
if the task gets cancelled before the return-on-cancel flag could
be changed, g_task_set_return_on_cancel() will indicate this by
returning %FALSE.
You can disable and re-enable this flag multiple times if you wish.
If the task's #GCancellable is cancelled while return-on-cancel is
%FALSE, then calling g_task_set_return_on_cancel() to set it %TRUE
again will cause the task to be cancelled at that point.
If the task's #GCancellable is already cancelled before you call
g_task_run_in_thread()/g_task_run_in_thread_sync(), then the
#GTaskThreadFunc will still be run (for consistency), but the task
will also be completed right away.
Sets or clears @task's return-on-cancel flag. This is only meaningful for tasks run via g_task_run_in_thread() or g_task_run_in_thread_sync().
If @return_on_cancel is %TRUE, then cancelling @task's #GCancellable will immediately cause it to return, as though the task's #GTaskThreadFunc had called g_task_return_error_if_cancelled() and then returned.
This allows you to create a cancellable wrapper around an uninterruptible function. The #GTaskThreadFunc just needs to be careful that it does not modify any externally-visible state after it has been cancelled. To do that, the thread should call g_task_set_return_on_cancel() again to (atomically) set return-on-cancel %FALSE before making externally-visible changes; if the task gets cancelled before the return-on-cancel flag could be changed, g_task_set_return_on_cancel() will indicate this by returning %FALSE.
You can disable and re-enable this flag multiple times if you wish. If the task's #GCancellable is cancelled while return-on-cancel is %FALSE, then calling g_task_set_return_on_cancel() to set it %TRUE again will cause the task to be cancelled at that point.
If the task's #GCancellable is already cancelled before you call g_task_run_in_thread()/g_task_run_in_thread_sync(), then the #GTaskThreadFunc will still be run (for consistency), but the task will also be completed right away.