Zero-initialized semaphores timed on the monotonic clock is the
most common form used by applications. Allow people to write more
compact code by providing creation calls and static initializers aimed
at building these directly:
- evl_new_sem(), EVL_SEM_INITIALIZER() for zero-init semaphores
timed on the monotonic clock.
- evl_new_sem_any() and EVL_SEM_ANY_INITIALIZER() usable for any
initialization form, specifying the clock and init value.
Philippe Gerum