note description: "[ Properties of the memory management 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: "$Date$" revision: "$Revision$" class MEM_INFO inherit MEMORY_STRUCTURE rename make as structure_make export {NONE} make_by_pointer, structure_make, item, shared end MEM_CONST create make feature -- Initialization make (memory: INTEGER) -- Update Current for `memory' type. require memory_valid: memory = Total_memory or memory = Eiffel_memory or memory = C_memory do structure_make update (memory) ensure type_set: type = memory end update (memory: INTEGER) -- Update Current for `memory' type. require memory_valid: memory = Total_memory or memory = Eiffel_memory or memory = C_memory do mem_stat (item, memory) type := memory ensure type_set: type = memory end feature -- Access type: INTEGER -- Memory type (Total, Eiffel, C) feature -- Measurement total: INTEGER -- Total number of bytes allocated for `type' -- before last call to `update' do Result := c_ml_total (item).as_integer_32 end used: INTEGER -- Number of bytes used for `type' -- before last call to `update' do Result := c_ml_used (item).as_integer_32 end free: INTEGER -- 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' do Result := c_ml_over (item).as_integer_32 end chunk: INTEGER -- Number of allocated memory chunks do Result := c_ml_chunk (item) end feature -- Extended measurement total64: NATURAL_64 -- Total number of bytes allocated for `type' -- before last call to `update' do Result := c_ml_total (item) end used64: NATURAL_64 -- Number of bytes used for `type' -- before last call to `update' do Result := c_ml_used (item) end free64: NATURAL_64 -- Number of bytes still free for `type' -- before last call to `update' do Result := total64 - used64 - overhead64 end overhead64: NATURAL_64 -- Number of bytes used by memory management -- scheme for `type' before last call to `update' do Result := c_ml_over (item) end feature {NONE} -- Implementation mem_stat (a_ptr: POINTER; mem: INTEGER) -- Initialize `a_ptr' used by MEM_INFO to retrieve the -- statistics frozen at the time of this call. external "C use %"eif_memory.h%"" alias "eif_mem_stat" end structure_size: INTEGER -- Size of underlying C structure. do Result := c_sizeof_emallinfo end feature {NONE} -- C externals c_ml_total (a_ptr: POINTER): NATURAL_64 -- Access `ml_total' data member of `a_ptr' struct. external "C inline use %"eif_memory.h%"" alias "return (EIF_NATURAL_64) ((struct emallinfo *) $a_ptr)->ml_total;" end c_ml_used (a_ptr: POINTER): NATURAL_64 -- Access `ml_used' data member of `a_ptr' struct. external "C inline use %"eif_memory.h%"" alias "return (EIF_NATURAL_64) ((struct emallinfo *) $a_ptr)->ml_used;" end c_ml_over (a_ptr: POINTER): NATURAL_64 -- Access `ml_over' data member of `a_ptr' struct. external "C inline use %"eif_memory.h%"" alias "return (EIF_NATURAL_64) ((struct emallinfo *) $a_ptr)->ml_over;" end c_ml_chunk (a_ptr: POINTER): INTEGER -- Access `ml_chunk' data member of `a_ptr' struct. external "C inline use %"eif_memory.h%"" alias "return (EIF_INTEGER) ((struct emallinfo *) $a_ptr)->ml_chunk;" end c_sizeof_emallinfo: INTEGER -- Size of struct `emallinfo'. external "C inline use %"eif_memory.h%"" alias "return sizeof(struct emallinfo);" ensure is_class: class end invariant consistent_memory: total64 = free64 + used64 + overhead64 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