A task can wait for a signal in non-interruptible mode.
A task can wait for a signal in non-interruptible mode.

	* src/scheduler/job.cc (yield_until_terminated): A task waiting
	for a signal can be in non-interruptible mode. The mode will be
	restored when the task is resumed.

urbiforge/urbi,urbiforge/urbi,aldebaran/urbi,aldebaran/urbi,urbiforge/urbi,urbiforge/urbi,urbiforge/urbi,aldebaran/urbi,aldebaran/urbi,urbiforge/urbi,aldebaran/urbi,aldebaran/urbi,aldebaran/urbi,aldebaran/urbi,urbiforge/urbi,urbiforge/urbi,urbiforge/urbi