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indexing
	description: "[
		Properties of the memory management mechanism.
		This class may be used as ancestor by classes needing its facilities.
	]"
	status: "See notice at end of class"
	date: "$Date: 2001-11-16 20:32:23 +0000 (Fri, 16 Nov 2001) $"
	revision: "$Revision: 51435 $"

class 
	MEM_INFO

create 
	make

feature -- Initialization

	make (memory: INTEGER) is
			-- Update Current for memory type.
			-- Was declared in MEM_INFO as synonym of update.
		do
			mem_stat (memory)
			type := memory
			total := mem_info (1)
			used := mem_info (2)
			overhead := mem_info (3)
		ensure
			type_updated: type = memory
		end

	update (memory: INTEGER) is
			-- Update Current for memory type.
			-- Was declared in MEM_INFO as synonym of make.
		do
			mem_stat (memory)
			type := memory
			total := mem_info (1)
			used := mem_info (2)
			overhead := mem_info (3)
		ensure
			type_updated: type = memory
		end
	
feature -- Access

	C_memory: INTEGER is 2
			-- Code for the C memory managed
			-- by the garbage collector
			-- (from MEM_CONST)

	Eiffel_memory: INTEGER is 1
			-- Code for the Eiffel memory managed
			-- by the garbage collector
			-- (from MEM_CONST)

	Full_collector: INTEGER is 0
			-- Statistics for full collections
			-- (from MEM_CONST)

	Incremental_collector: INTEGER is 1
			-- Statistics for incremental collections
			-- (from MEM_CONST)

	Total_memory: INTEGER is 0
			-- Code for all the memory managed
			-- by the garbage collector
			-- (from MEM_CONST)

	type: INTEGER
			-- Memory type (Total, Eiffel, C)
	
feature -- Measurement

	free: INTEGER is
			-- Number of bytes still free for type
			-- before last call to update
		do
			Result := total - used - overhead
		ensure
			computed: Result = total - used - overhead
		end

	overhead: INTEGER
			-- Number of bytes used by memory management
			-- scheme for type before last call to update

	total: INTEGER
			-- Total number of bytes allocated for type
			-- before last call to update

	used: INTEGER
			-- Number of bytes used for type
			-- before last call to update
	
feature {NONE} -- Implementation

	mem_info (field: INTEGER): INTEGER is
			-- Read memory accounting structure, field by field.
		external
			"C | %"eif_memory.h%""
		end

	mem_stat (mem: INTEGER) is
			-- Initialize run-time buffer used by mem_info to retrieve the
			-- statistics frozen at the time of this call.
		external
			"C | %"eif_memory.h%""
		end
	
invariant

	consistent_memory: total = free + used + overhead
		-- from ANY
	reflexive_equality: standard_is_equal (Current)
	reflexive_conformance: conforms_to (Current)

indexing
	library: "[
			EiffelBase: Library of reusable components for Eiffel.
	]"
	status: "[
			Copyright 1986-2001 Interactive Software Engineering (ISE).
			For ISE customers the original versions are an ISE product
			covered by the ISE Eiffel license and support agreements.
	]"
	license: "[
			EiffelBase may now be used by anyone as FREE SOFTWARE to
			develop any product, public-domain or commercial, without
			payment to ISE, under the terms of the ISE Free Eiffel Library
			License (IFELL) at http://eiffel.com/products/base/license.html.
	]"
	source: "[
			Interactive Software Engineering Inc.
			ISE Building
			360 Storke Road, Goleta, CA 93117 USA
			Telephone 805-685-1006, Fax 805-685-6869
			Electronic mail <info@eiffel.com>
			Customer support http://support.eiffel.com
	]"
	info: "[
			For latest info see award-winning pages: http://eiffel.com
	]"

end -- class MEM_INFO


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