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	description: "Objects identified, uniquely during any session, by an integer"
	status: "See notice at end of class"
	date: "$Date: 2001-11-16 20:32:23 +0000 (Fri, 16 Nov 2001) $"
	revision: "$Revision: 51435 $"

class 
	IDENTIFIED

feature -- Access

	frozen id_object (an_id: INTEGER): IDENTIFIED is
			-- Object associated with an_id (void if no such object)
		do
			Result := eif_id_object (an_id)
		ensure
			consistent: Result = void or else Result.object_id = an_id
		end

	frozen object_id: INTEGER is
			-- Unique for current object in any given session
		do
			if internal_id = 0 then
				internal_id := eif_object_id (Current)
			end
			Result := internal_id
		ensure
			valid_id: id_object (Result) = Current
		end
	
feature {NONE} -- 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)
	
feature {NONE} -- Measurement

	gc_statistics (collector_type: INTEGER): GC_INFO is
			-- Garbage collection information for collector_type.
			-- (from MEMORY)
		require -- from MEMORY
			type_ok: collector_type = full_collector or collector_type = incremental_collector
		do
			create Result.make (collector_type)
		end

	memory_statistics (memory_type: INTEGER): MEM_INFO is
			-- Memory usage information for memory_type
			-- (from MEMORY)
		require -- from MEMORY
			type_ok: memory_type = total_memory or memory_type = eiffel_memory or memory_type = c_memory
		do
			create Result.make (memory_type)
		end
	
feature -- Comparison

	is_equal (other: like Current): BOOLEAN is
			-- Is other attached to an object considered
			-- equal to current object?
		require -- from ANY
			other_not_void: other /= void
		local
			int_id: INTEGER
		do
			int_id := internal_id
			internal_id := other.internal_id
			Result := standard_is_equal (other)
			internal_id := int_id
		ensure -- from ANY
			symmetric: Result implies other.is_equal (Current)
			consistent: standard_is_equal (other) implies Result
		end
	
feature -- Status report

	frozen id_freed: BOOLEAN is
			-- Has Current been removed from the table?
		do
			Result := id_object (internal_id) = void
		end
	
feature {NONE} -- Status report

	chunk_size: INTEGER is
			-- Minimal size of a memory chunk. The run-time always
			-- allocates a multiple of this size.
			-- If the environment variable EIF_MEMORY_CHUNK
			-- is defined, it is set to the closest reasonable
			-- value from it.
			-- (from MEMORY)
		external
			"C | %"eif_memory.h%""
		alias
			"eif_get_chunk_size"
		end

	coalesce_period: INTEGER is
			-- Period of full coalesce (in number of collections)
			-- If the environment variable EIF_FULL_COALESCE_PERIOD
			-- is defined, it is set to the closest reasonable
			-- value from it.
			-- If null, no full coalescing is launched.
			-- (from MEMORY)
		external
			"C | %"eif_memory.h%""
		alias
			"eif_coalesce_period"
		end

	collecting: BOOLEAN is
			-- Is garbage collection enabled?
			-- (from MEMORY)
		external
			"C | %"eif_memory.h%""
		alias
			"gc_ison"
		end

	collection_period: INTEGER is
			-- Period of full collection.
			-- If the environment variable EIF_FULL_COLLECTION_PERIOD
			-- is defined, it is set to the closest reasonable
			-- value from it.
			-- If null, no full collection is launched.
			-- (from MEMORY)
		external
			"C | %"eif_memory.h%""
		alias
			"mem_pget"
		end

	generation_object_limit: INTEGER is
			-- Maximum size of object in generational scavenge zone.
			-- If the environment variable EIF_GS_LIMIT
			-- is defined, it is set to the closest reasonable
			-- value from it.
			-- (from MEMORY)
		external
			"C | %"eif_memory.h%""
		alias
			"eif_generation_object_limit"
		end

	largest_coalesced_block: INTEGER is
			-- Size of largest coalesced block since last call to
			-- largest_coalesced; 0 if none.
			-- (from MEMORY)
		external
			"C | %"eif_memory.h%""
		alias
			"mem_largest"
		end

	max_mem: INTEGER is
			-- Maximum amount of bytes the run-time can allocate.
			-- (from MEMORY)
		external
			"C | %"eif_memory.h%""
		alias
			"eif_get_max_mem"
		end

	memory_threshold: INTEGER is
			-- Minimum amount of bytes to be allocated before
			-- starting an automatic garbage collection.
			-- (from MEMORY)
		external
			"C | %"eif_memory.h%""
		alias
			"mem_tget"
		end

	referers (an_object: ANY): ARRAY [ANY] is
			-- Objects that refer to an_object.
			-- (from MEMORY)
		local
			a: ANY
		do
			create Result.make (0, 200)
			a := Result.area
			find_referers ($an_object, $a, Result.count)
		end

	scavenge_zone_size: INTEGER is
			-- Size of generational scavenge zone.
			-- If the environment variable EIF_MEMORY_SCAVENGE
			-- is defined, it is set to the closest reasonable
			-- value from it.
			-- (from MEMORY)
		external
			"C | %"eif_memory.h%""
		alias
			"eif_scavenge_zone_size"
		end

	tenure: INTEGER is
			-- Maximum age of object before being considered
			-- as old (old objects are not scanned during
			-- partial collection).
			-- If the environment variable EIF_TENURE_MAX
			-- is defined, it is set to the closest reasonable
			-- value from it.
			-- (from MEMORY)
		external
			"C | %"eif_memory.h%""
		alias
			"eif_tenure"
		end
	
feature {NONE} -- Status setting

	allocate_compact is
			-- Enter `memory' mode: will try to compact memory
			-- before requesting more from the operating system.
			-- (from MEMORY)
		external
			"C | %"eif_memory.h%""
		alias
			"mem_slow"
		end

	allocate_fast is
			-- Enter `speed' mode: will optimize speed of memory
			-- allocation rather than memory usage.
			-- (from MEMORY)
		external
			"C | %"eif_memory.h%""
		alias
			"mem_speed"
		end

	allocate_tiny is
			-- Enter `tiny' mode: will enter `memory' mode
			-- after having freed as much memory as possible.
			-- (from MEMORY)
		external
			"C | %"eif_memory.h%""
		alias
			"mem_tiny"
		end

	collection_off is
			-- Disable garbage collection.
			-- (from MEMORY)
		external
			"C | %"eif_garcol.h%""
		alias
			"gc_stop"
		end

	collection_on is
			-- Enable garbage collection.
			-- (from MEMORY)
		external
			"C | %"eif_garcol.h%""
		alias
			"gc_run"
		end

	disable_time_accounting is
			-- Disable GC time accounting (default).
			-- (from MEMORY)
		do
			gc_monitoring (False)
		end

	enable_time_accounting is
			-- Enable GC time accouting, accessible in gc_statistics.
			-- (from MEMORY)
		do
			gc_monitoring (True)
		end

	set_coalesce_period (value: INTEGER) is
			-- Set coalesce_period. Every value collection,
			-- the Garbage Collector will coalesce
			-- the whole memory.
			-- (from MEMORY)
		require -- from MEMORY
			positive_value: value >= 0
		external
			"C | %"eif_memory.h%""
		alias
			"eif_set_coalesce_period"
		end

	set_collection_period (value: INTEGER) is
			-- Set collection_period. Every value collection,
			-- the Garbage collector will perform a collection
			-- on the whole memory (full collection), otherwise
			-- a simple partial collection is done.
			-- (from MEMORY)
		require -- from MEMORY
			positive_value: value >= 0
		external
			"C | %"eif_memory.h%""
		alias
			"mem_pset"
		end

	set_max_mem (value: INTEGER) is
			-- Set the maximum amount of memory the run-time can allocate.
			-- (from MEMORY)
		require -- from MEMORY
			positive_value: value > 0
		external
			"C | %"eif_memory.h%""
		alias
			"eif_set_max_mem"
		end

	set_memory_threshold (value: INTEGER) is
			-- Set a new memory_threshold in bytes. Whenever the memory
			-- allocated for Eiffel reaches this value, an automatic
			-- collection is performed.
			-- (from MEMORY)
		require -- from MEMORY
			positive_value: value > 0
		external
			"C | %"eif_memory.h%""
		alias
			"mem_tset"
		end
	
feature -- Removal

	frozen free_id is
			-- Free the entry associated with object_id if any
		do
			if internal_id /= 0 then
				eif_object_id_free (internal_id)
			end
		ensure
			object_freed: id_freed
		end
	
feature {NONE} -- Removal

	collect is
			-- Force a partial collection cycle if garbage
			-- collection is enabled; do nothing otherwise.
			-- (from MEMORY)
		external
			"C | %"eif_eiffel.h%""
		end

	dispose is
			-- Free the entry associated with object_id if any
		do
			free_id
		ensure then
			object_freed: id_freed
		end

	free (object: ANY) is
			-- Free object, by-passing garbage collection.
			-- Erratic behavior will result if the object is still
			-- referenced.
			-- (from MEMORY)
		do
			mem_free ($object)
		end

	full_coalesce is
			-- Coalesce the whole memory: merge adjacent free
			-- blocks to reduce fragmentation. Useful, when
			-- a lot of memory is allocated with garbage collector off.
			-- (from MEMORY)
		external
			"C | %"eif_memory.h%""
		alias
			"mem_coalesc"
		end

	full_collect is
			-- Force a full collection cycle if garbage
			-- collection is enabled; do nothing otherwise.
			-- (from MEMORY)
		external
			"C | %"eif_garcol.h%""
		alias
			"plsc"
		end

	mem_free (addr: POINTER) is
			-- Free memory of object at addr.
			-- (Preferred interface is free.)
			-- (from MEMORY)
		external
			"C | %"eif_memory.h%""
		end
	
feature -- Duplication

	copy (other: like Current) is
			-- Update current object using fields of object attached
			-- to other, so as to yield equal objects.
		require -- from ANY
			other_not_void: other /= void
			type_identity: same_type (other)
		local
			int_id: INTEGER
		do
			int_id := internal_id
			standard_copy (other)
			internal_id := int_id
		ensure -- from ANY
			is_equal: is_equal (other)
		end
	
feature {IDENTIFIED} -- Implementation

	internal_id: INTEGER
			-- Internal representation of object_id
	
feature {NONE} -- Implementation

	find_referers (target: POINTER; esult: POINTER; result_size: INTEGER) is
			-- (from MEMORY)
		external
			"C | %"eif_traverse.h%""
		end

	gc_monitoring (flag: BOOLEAN) is
			-- Set up GC monitoring according to flag
			-- (from MEMORY)
		external
			"C | %"eif_memory.h%""
		alias
			"gc_mon"
		end
	
feature {NONE} -- Externals

	eif_id_object (an_id: INTEGER): IDENTIFIED is
			-- Object associated with an_id
		external
			"C | %"eif_object_id.h%""
		end

	eif_object_id (an_object: IDENTIFIED): INTEGER is
			-- New identifier for an_object
		external
			"C | %"eif_object_id.h%""
		end

	eif_object_id_free (an_id: INTEGER) is
			-- Free the entry an_id
		external
			"C | %"eif_object_id.h%""
		end
	
invariant

		-- 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 IDENTIFIED


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