note
	description: "Semaphore synchronization object, allows threads to access global data through critical sections."
	legal: "See notice at end of class."
	status: "See notice at end of class."
	date: "$Date: 2017-05-25 15:02:28 +0000 (Thu, 25 May 2017) $"
	revision: "$Revision: 100436 $"

class interface
	SEMAPHORE

create 
	make

feature -- Access

	is_set: BOOLEAN
			-- Is semaphore initialized?
	
feature -- Status setting

	try_wait: BOOLEAN
			-- Has client been successful in decrementing semaphore
			-- count without waiting?
		require
			valid_semaphore: is_set

	wait
			-- Decrement semaphore count, waiting if necessary until
			-- that becomes possible.
		require
			valid_semaphore: is_set

	post
			-- Increment semaphore count.
		require
			valid_semaphore: is_set

	destroy
			-- Destroy semaphore.
		require
			valid_semaphore: is_set
		ensure
			not_set: not is_set
	
feature -- Removal

	dispose
			-- Called by the garbage collector when the semaphore
			-- is collected.
	
note
	copyright: "Copyright (c) 1984-2017, Eiffel Software and others"
	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
	source: "[
		Eiffel Software
		5949 Hollister Ave., Goleta, CA 93117 USA
		Telephone 805-685-1006, Fax 805-685-6869
		Website http://www.eiffel.com
		Customer support http://support.eiffel.com
	]"

end -- class SEMAPHORE

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