returns the original FiberId set for the handle, whether still valid or not
Reset the handle to uninitialized state
the FiberId described by the handle. If the handle is no longer valid, will return FiberId.invalid
Returns whether the handle was set
Returns whether the handle currently describes a running fiber.
A handle to a running fiber.
This handle expires automatically when the fiber stops running. Unless you know, semantically, that a fiber is still running, don't assume there is a running fiber attached to this handle.
The handle will correctly claim invalidity even if a new fiber is launched with the same FiberId.