EiffelBase class
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indexing
	description: "Garbage collector statistics.This class may be used as ancestor by classes needing its facilities.Time accounting is relevant only if `enable_time_accounting%' (from MEMORY) has been called.";
	status: "See notice at end of class";
	date: "$Date: 2007-03-30 19:10:11 +0000 (Fri, 30 Mar 2007) $";
	revision: "$Revision: 95354 $"

class GC_INFO

inherit
	MEM_CONST

creation
	make

feature -- Initialization

	make (memory: INTEGER) is
			-- Fill in statistics for memory type
			-- Was declared in GC_INFO as synonym of make and update.
		do
			gc_stat (memory);
			cycle_count := gc_info (0);
			memory_used := gc_info (1);
			collected := gc_info (2);
			collected_average := gc_info (3);
			real_time := gc_info (4);
			real_time_average := gc_info (5);
			real_interval_time := gc_info (6);
			real_interval_time_average := gc_info (7);
			cpu_time := gc_infod (8);
			cpu_time_average := gc_infod (9);
			cpu_interval_time := gc_infod (10);
			cpu_interval_time_average := gc_infod (11);
			sys_time := gc_infod (12);
			sys_time_average := gc_infod (13);
			sys_interval_time := gc_infod (14);
			sys_interval_time_average := gc_infod (15)
		end;

	update (memory: INTEGER) is
			-- Fill in statistics for memory type
			-- Was declared in GC_INFO as synonym of make and update.
		do
			gc_stat (memory);
			cycle_count := gc_info (0);
			memory_used := gc_info (1);
			collected := gc_info (2);
			collected_average := gc_info (3);
			real_time := gc_info (4);
			real_time_average := gc_info (5);
			real_interval_time := gc_info (6);
			real_interval_time_average := gc_info (7);
			cpu_time := gc_infod (8);
			cpu_time_average := gc_infod (9);
			cpu_interval_time := gc_infod (10);
			cpu_interval_time_average := gc_infod (11);
			sys_time := gc_infod (12);
			sys_time_average := gc_infod (13);
			sys_interval_time := gc_infod (14);
			sys_interval_time_average := gc_infod (15)
		end;

feature -- Access

	type: INTEGER;
			-- Collector type (Full, Collect),
			-- for type before last call to update

	cycle_count: INTEGER;
			-- Number of collection cycles for type
			-- before last call to update

	memory_used: INTEGER;
			-- Total number of bytes used (counting overhead)
			-- after last cycle for type before last
			-- call to update

	collected: INTEGER;
			-- Number of bytes collected by the last cycle,
			-- for type before last call to update

	collected_average: INTEGER;
			-- Average number of bytes collected by a cycle,
			-- for type before last call to update

	real_time: INTEGER;
			-- Real time in centi-seconds used by last cycle
			-- for type, before last call to update;
			-- this may not be accurate on systems which do not
			-- provide a sub-second accuracy clock (typically
			-- provided on BSD).

	real_time_average: INTEGER;
			-- Average amount of real time, in centi-seconds,
			-- spent in collection cycle,
			-- for type before last call to update

	real_interval_time: INTEGER;
			-- Real interval time (as opposed to CPU time) between
			-- two automatically raised cycles, in centi-seconds,
			-- for type before last call to update

	real_interval_time_average: INTEGER;
			-- Average real interval time between two automatic
			-- cycles, in centi-seconds,
			-- for type before last call to update

	cpu_time: DOUBLE;
			-- Amount of CPU time, in seconds, spent in cycle,
			-- for type before last call to update

	cpu_time_average: DOUBLE;
			-- Average amount of CPU time spent in cycle,
			-- in seconds, for type before last call to update

	cpu_interval_time: DOUBLE;
			-- Amount of CPU time elapsed since between last
			-- and penultimate cycles for type before
			-- last call to update

	cpu_interval_time_average: DOUBLE;
			-- Average amount of CPU time between two cycles,
			-- for type before last call to update

	sys_time: DOUBLE;
			-- Amount of kernel time, in seconds, spent in cycle,
			-- for type before last call to update

	sys_time_average: DOUBLE;
			-- Average amount of kernel time spent in cycle,
			-- for type before last call to update

	sys_interval_time: DOUBLE;
			-- Amount of kernel time elapsed since between
			-- the last and the penultimate cycle,
			-- for type before last call to update

	sys_interval_time_average: DOUBLE;
			-- Average amount of kernel time between two cycles,
			-- for type before last call to update

feature {NONE} -- Implementation

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

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

	gc_infod (field: INTEGER): DOUBLE is
			-- Read GC accounting structure, field by field.
		external
			"C | %"eif_memory.h%""
		end;

end -- class GC_INFO

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