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note description: "[ Facilities for tuning up the garbage collection mechanism. This class may be used as ancestor by classes needing its facilities. ]" library: "Free implementation of ELKS library" status: "See notice at end of class." legal: "See notice at end of class." date: "$Date: 2018-04-28 12:47:46 -0800 (Sat, 28 Apr 2018) $" revision: "$Revision: 101696 $" class interface MEMORY create default_create -- Process instances of classes with no creation clause. -- (Default: do nothing.) -- (from ANY) feature -- Access C_memory: INTEGER_32 = 2 -- Code for the C memory managed -- by the garbage collector -- (from MEM_CONST) Eiffel_memory: INTEGER_32 = 1 -- Code for the Eiffel memory managed -- by the garbage collector -- (from MEM_CONST) Full_collector: INTEGER_32 = 0 -- Statistics for full collections -- (from MEM_CONST) generating_type: TYPE [detachable MEMORY] -- Type of current object -- (type of which it is a direct instance) -- (from ANY) ensure -- from ANY generating_type_not_void: Result /= Void generator: STRING_8 -- Name of current object's generating class -- (base class of the type of which it is a direct instance) -- (from ANY) ensure -- from ANY generator_not_void: Result /= Void generator_not_empty: not Result.is_empty Incremental_collector: INTEGER_32 = 1 -- Statistics for incremental collections -- (from MEM_CONST) Total_memory: INTEGER_32 = 0 -- Code for all the memory managed -- by the garbage collector -- (from MEM_CONST) feature -- Measurement gc_statistics (collector_type: INTEGER_32): GC_INFO -- Garbage collection information for collector_type. require type_ok: collector_type = Full_collector or collector_type = Incremental_collector ensure instance_free: class memory_statistics (memory_type: INTEGER_32): MEM_INFO -- Memory usage information for memory_type require type_ok: memory_type = Total_memory or memory_type = Eiffel_memory or memory_type = C_memory ensure instance_free: class feature -- Comparison frozen deep_equal (a: detachable ANY; b: like arg #1): BOOLEAN -- Are a and b either both void -- or attached to isomorphic object structures? -- (from ANY) ensure -- from ANY instance_free: class shallow_implies_deep: standard_equal (a, b) implies Result both_or_none_void: (a = Void) implies (Result = (b = Void)) same_type: (Result and (a /= Void)) implies (b /= Void and then a.same_type (b)) symmetric: Result implies deep_equal (b, a) frozen equal (a: detachable ANY; b: like arg #1): BOOLEAN -- Are a and b either both void or attached -- to objects considered equal? -- (from ANY) ensure -- from ANY instance_free: class definition: Result = (a = Void and b = Void) or else ((a /= Void and b /= Void) and then a.is_equal (b)) frozen is_deep_equal (other: MEMORY): BOOLEAN -- Are Current and other attached to isomorphic object structures? -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY shallow_implies_deep: standard_is_equal (other) implies Result same_type: Result implies same_type (other) symmetric: Result implies other.is_deep_equal (Current) is_equal (other: MEMORY): BOOLEAN -- Is other attached to an object considered -- equal to current object? -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY symmetric: Result implies other ~ Current consistent: standard_is_equal (other) implies Result frozen standard_equal (a: detachable ANY; b: like arg #1): BOOLEAN -- Are a and b either both void or attached to -- field-by-field identical objects of the same type? -- Always uses default object comparison criterion. -- (from ANY) ensure -- from ANY instance_free: class definition: Result = (a = Void and b = Void) or else ((a /= Void and b /= Void) and then a.standard_is_equal (b)) frozen standard_is_equal (other: MEMORY): BOOLEAN -- Is other attached to an object of the same type -- as current object, and field-by-field identical to it? -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY same_type: Result implies same_type (other) symmetric: Result implies other.standard_is_equal (Current) feature -- Status report chunk_size: INTEGER_32 -- 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. ensure instance_free: class coalesce_period: INTEGER_32 -- 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. ensure instance_free: class collecting: BOOLEAN -- Is garbage collection enabled? ensure instance_free: class collection_period: INTEGER_32 -- 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. ensure instance_free: class conforms_to (other: ANY): BOOLEAN -- Does type of current object conform to type -- of other (as per Eiffel: The Language, chapter 13)? -- (from ANY) require -- from ANY other_not_void: other /= Void generation_object_limit: INTEGER_32 -- 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. ensure instance_free: class largest_coalesced_block: INTEGER_32 -- Size of largest coalesced block since last call to -- largest_coalesced; 0 if none. ensure instance_free: class max_mem: INTEGER_32 -- Maximum amount of bytes the run-time can allocate. ensure instance_free: class memory_count_map: HASH_TABLE [INTEGER_32, INTEGER_32] -- Number of instances per dynamic type present in system. -- Same as memory_map except that no references on the objects themselves -- is kept. ensure instance_free: class memory_map: HASH_TABLE [ARRAYED_LIST [ANY], INTEGER_32] -- Retrieves all object in system as a table indexed by dynamic type -- where elements are all instances of a given data type. ensure instance_free: class memory_threshold: INTEGER_32 -- Minimum amount of bytes to be allocated before -- starting an automatic garbage collection. ensure instance_free: class objects_instance_of (an_object: ANY): SPECIAL [ANY] -- Objects that have same dynamic type as an_object. ensure instance_free: class objects_instance_of_type (a_type_id: INTEGER_32): SPECIAL [ANY] -- Objects that have same dynamic type as an_object. ensure instance_free: class referers (an_object: ANY): SPECIAL [ANY] -- Objects that refer to an_object. ensure instance_free: class same_type (other: ANY): BOOLEAN -- Is type of current object identical to type of other? -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY definition: Result = (conforms_to (other) and other.conforms_to (Current)) scavenge_zone_size: INTEGER_32 -- Size of generational scavenge zone. -- If the environment variable EIF_MEMORY_SCAVENGE -- is defined, it is set to the closest reasonable -- value from it. ensure instance_free: class tenure: INTEGER_32 -- 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. ensure instance_free: class feature -- Status setting allocate_compact -- Enter memory mode: will try to compact memory -- before requesting more from the operating system. ensure instance_free: class allocate_fast -- Enter speed mode: will optimize speed of memory -- allocation rather than memory usage. ensure instance_free: class allocate_tiny -- Enter tiny mode: will enter memory mode -- after having freed as much memory as possible. ensure instance_free: class collection_off -- Disable garbage collection. ensure instance_free: class collection_on -- Enable garbage collection. ensure instance_free: class disable_time_accounting -- Disable GC time accounting (default). ensure instance_free: class enable_time_accounting -- Enable GC time accouting, accessible in gc_statistics. ensure instance_free: class execute_without_collection (a_action: PROCEDURE) -- Execute a_action with the garbage collector disabled. -- If a_action modifies the status of collecting, we restore -- it no matter what at the end. require a_action_not_void: a_action /= Void ensure instance_free: class collection_status_preserved: collecting = old collecting set_coalesce_period (value: INTEGER_32) -- Set coalesce_period. Every value collection, -- the Garbage Collector will coalesce -- the whole memory. require positive_value: value >= 0 ensure instance_free: class set_collection_period (value: INTEGER_32) -- 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. require positive_value: value >= 0 ensure instance_free: class set_max_mem (value: INTEGER_32) -- Set the maximum amount of memory the run-time can allocate. require positive_value: value > 0 ensure instance_free: class set_memory_threshold (value: INTEGER_32) -- Set a new memory_threshold in bytes. Whenever the memory -- allocated for Eiffel reaches this value, an automatic -- collection is performed. require positive_value: value > 0 ensure instance_free: class feature -- Removal collect -- Force a partial collection cycle if garbage -- collection is enabled; do nothing otherwise. ensure instance_free: class dispose -- Action to be executed just before garbage collection -- reclaims an object. -- Default version does nothing; redefine in descendants -- to perform specific dispose actions. Those actions -- should only take care of freeing external resources; -- they should not perform remote calls on other objects -- since these may also be dead and reclaimed. free (object: ANY) -- Free object, by-passing garbage collection. -- Erratic behavior will result if the object is still -- referenced. ensure instance_free: class full_coalesce -- Coalesce the whole memory: merge adjacent free -- blocks to reduce fragmentation. Useful, when -- a lot of memory is allocated with garbage collector off. ensure instance_free: class full_collect -- Force a full collection cycle if garbage -- collection is enabled; do nothing otherwise. ensure instance_free: class feature -- Duplication copy (other: MEMORY) -- Update current object using fields of object attached -- to other, so as to yield equal objects. -- (from ANY) require -- from ANY other_not_void: other /= Void type_identity: same_type (other) ensure -- from ANY is_equal: Current ~ other frozen deep_copy (other: MEMORY) -- Effect equivalent to that of: -- copy (other . deep_twin) -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY deep_equal: deep_equal (Current, other) frozen deep_twin: MEMORY -- New object structure recursively duplicated from Current. -- (from ANY) ensure -- from ANY deep_twin_not_void: Result /= Void deep_equal: deep_equal (Current, Result) frozen standard_copy (other: MEMORY) -- Copy every field of other onto corresponding field -- of current object. -- (from ANY) require -- from ANY other_not_void: other /= Void type_identity: same_type (other) ensure -- from ANY is_standard_equal: standard_is_equal (other) frozen standard_twin: MEMORY -- New object field-by-field identical to other. -- Always uses default copying semantics. -- (from ANY) ensure -- from ANY standard_twin_not_void: Result /= Void equal: standard_equal (Result, Current) frozen twin: MEMORY -- New object equal to Current -- twin calls copy; to change copying/twinning semantics, redefine copy. -- (from ANY) ensure -- from ANY twin_not_void: Result /= Void is_equal: Result ~ Current feature -- Basic operations frozen default: detachable MEMORY -- Default value of object's type -- (from ANY) frozen default_pointer: POINTER -- Default value of type POINTER -- (Avoid the need to write p.default for -- some p of type POINTER.) -- (from ANY) ensure -- from ANY instance_free: class default_rescue -- Process exception for routines with no Rescue clause. -- (Default: do nothing.) -- (from ANY) frozen do_nothing -- Execute a null action. -- (from ANY) ensure -- from ANY instance_free: class feature -- Output Io: STD_FILES -- Handle to standard file setup -- (from ANY) ensure -- from ANY instance_free: class io_not_void: Result /= Void out: STRING_8 -- New string containing terse printable representation -- of current object -- (from ANY) ensure -- from ANY out_not_void: Result /= Void print (o: detachable ANY) -- Write terse external representation of o -- on standard output. -- (from ANY) ensure -- from ANY instance_free: class frozen tagged_out: STRING_8 -- New string containing terse printable representation -- of current object -- (from ANY) ensure -- from ANY tagged_out_not_void: Result /= Void feature -- Platform Operating_environment: OPERATING_ENVIRONMENT -- Objects available from the operating system -- (from ANY) ensure -- from ANY instance_free: class operating_environment_not_void: Result /= Void invariant -- from ANY reflexive_equality: standard_is_equal (Current) reflexive_conformance: conforms_to (Current) note copyright: "Copyright (c) 1984-2018, 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 MEMORY
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