spawn

Request this to spawn a [class@Dex.

Fiber].

The fiber will have its own stack and cooperatively schedules among other fibers sharing the scheduler.

If stack_size is 0, it will set to a sensible default. Otherwise, it is rounded up to the nearest page size.

```c static DexFuture * fiber_func (gpointer data) { GInputStream *stream = data; g_autoptr(GError) error = NULL; g_autoptr(GBytes) bytes = NULL;

if (!(bytes = dex_await_boxed (dex_input_stream_read_bytes (stream, 4096, 0), &error))) return dex_future_new_for_error ( g_steal_pointer (&error));

...

return dex_future_new_true (); }

DexFuture * spawn_fiber (GInputStream *stream) { return dex_scheduler_spawn (NULL, 0, fiber_func, g_object_ref (stream), g_object_unref); } ```

Parameters:

this	a [class@Dex.Scheduler]
stack_size	stack size in bytes or 0
func	a [callback@Dex.FiberFunc]
func_data	closure data for func
func_data_destroy	closure notify for func_data

Returns:

a [class@Dex.Future] that will resolve or reject when func completes (or its resulting `DexFuture` completes).