note
	description: "Class defining thread attributes."
	legal: "See notice at end of class."
	status: "See notice at end of class."
	date: "$Date: 2017-03-30 11:54:40 +0000 (Thu, 30 Mar 2017) $"
	revision: "$Revision: 100070 $"

class 
	THREAD_ATTRIBUTES

create 
	make

feature {NONE} -- Initialization

	default_create
			-- Process instances of classes with no creation clause.
			-- (Default: do nothing.)
			-- (from ANY)
		do
		end

	make
			-- Set default values to the thread attributes.
		do
			mem_make
			set_priority (default_priority)
		ensure
			priority_set: priority = default_priority
			stack_size_set: stack_size = 0
		end
	
feature -- Initialization

	mem_make
			-- Initialize current with given structure_size.
			-- (from MEMORY_STRUCTURE)
		local
			null: POINTER
		do
			internal_item := null
			create managed_pointer.make (structure_size)
			shared := False
		ensure -- from MEMORY_STRUCTURE
			not_shared: not shared
		end

	make_by_pointer (a_ptr: POINTER)
			-- Initialize current with a_ptr.
			-- (from MEMORY_STRUCTURE)
		require -- from MEMORY_STRUCTURE
			a_ptr_not_null: a_ptr /= default_pointer
		do
			internal_item := a_ptr
			managed_pointer := Void
			shared := True
		ensure -- from MEMORY_STRUCTURE
			shared: shared
		end
	
feature -- Access

	default_priority: INTEGER_32
			-- Get default thread priority for the current architecture.
		external
			"C use %"eif_threads.h%""
		alias
			"eif_thr_default_priority"
		end

	generating_type: TYPE [detachable THREAD_ATTRIBUTES]
			-- Type of current object
			-- (type of which it is a direct instance)
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			generating_type_not_void: Result /= Void
		end

	generator: STRING_8
			-- Name of current object's generating class
			-- (base class of the type of which it is a direct instance)
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			generator_not_void: Result /= Void
			generator_not_empty: not Result.is_empty
		end

	item: POINTER
			-- Access to memory area.
			-- (from MEMORY_STRUCTURE)
		local
			m: like managed_pointer
		do
			if shared then
				Result := internal_item
			else
				m := managed_pointer
				if m /= Void then
					Result := m.item
				end
			end
		end

	max_priority: INTEGER_32
			-- Get maximum thread priority for the current architecture.
		external
			"C use %"eif_threads.h%""
		alias
			"eif_thr_max_priority"
		end

	min_priority: INTEGER_32
			-- Get minimum thread priority for the current architecture.
		external
			"C use %"eif_threads.h%""
		alias
			"eif_thr_min_priority"
		end

	priority: INTEGER_32
			-- Current thread priority
		do
			Result := c_priority (item)
		end

	shared: BOOLEAN
			-- Is current memory area shared with others?
			-- (from MEMORY_STRUCTURE)

	stack_size: NATURAL_64
			-- Size of the call stack reserved for launching the thread. If 0 the default size for
			-- the current platform.
		do
			Result := c_stack_size (item)
		end
	
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)
		do
			if a = Void then
				Result := b = Void
			else
				Result := b /= Void and then a.is_deep_equal (b)
			end
		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)
		end

	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)
		do
			if a = Void then
				Result := b = Void
			else
				Result := b /= Void and then a.is_equal (b)
			end
		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))
		end

	frozen is_deep_equal alias "≡≡≡" (other: THREAD_ATTRIBUTES): BOOLEAN
			-- Are Current and other attached to isomorphic object structures?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		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)
		end

	is_equal (other: THREAD_ATTRIBUTES): BOOLEAN
			-- Is other attached to an object considered
			-- equal to current object?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		ensure -- from ANY
			symmetric: Result implies other ~ Current
			consistent: standard_is_equal (other) implies Result
		end

	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)
		do
			if a = Void then
				Result := b = Void
			else
				Result := b /= Void and then a.standard_is_equal (b)
			end
		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))
		end

	frozen standard_is_equal alias "≜" (other: THREAD_ATTRIBUTES): 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
		external
			"built_in"
		ensure -- from ANY
			same_type: Result implies same_type (other)
			symmetric: Result implies other.standard_is_equal (Current)
		end
	
feature -- Status report

	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
		external
			"built_in"
		end

	exists: BOOLEAN
			-- Is allocated memory still allocated?
			-- (from MEMORY_STRUCTURE)
		do
			Result := item /= default_pointer
		end

	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
		external
			"built_in"
		ensure -- from ANY
			definition: Result = (conforms_to (other) and other.conforms_to (Current))
		end
	
feature -- Duplication

	frozen clone (other: detachable ANY): like other
		obsolete "Use `twin' instead. [2017-05-31]"
			-- Void if other is void; otherwise new object
			-- equal to other
			--
			-- For non-void other, clone calls copy;
			-- to change copying/cloning semantics, redefine copy.
			-- (from ANY)
		do
			if other /= Void then
				Result := other.twin
			end
		ensure -- from ANY
			instance_free: class
			equal: Result ~ other
		end

	copy (other: THREAD_ATTRIBUTES)
			-- 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)
		external
			"built_in"
		ensure -- from ANY
			is_equal: Current ~ other
		end

	frozen deep_clone (other: detachable ANY): like other
		obsolete "Use `deep_twin' instead. [2017-05-31]"
			-- Void if other is void: otherwise, new object structure
			-- recursively duplicated from the one attached to other
			-- (from ANY)
		do
			if other /= Void then
				Result := other.deep_twin
			end
		ensure -- from ANY
			instance_free: class
			deep_equal: deep_equal (other, Result)
		end

	frozen deep_copy (other: THREAD_ATTRIBUTES)
			-- Effect equivalent to that of:
			--		copy (other . deep_twin)
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		do
			copy (other.deep_twin)
		ensure -- from ANY
			deep_equal: deep_equal (Current, other)
		end

	frozen deep_twin: THREAD_ATTRIBUTES
			-- New object structure recursively duplicated from Current.
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			deep_twin_not_void: Result /= Void
			deep_equal: deep_equal (Current, Result)
		end

	frozen standard_clone (other: detachable ANY): like other
		obsolete "Use `standard_twin' instead. [2017-05-31]"
			-- Void if other is void; otherwise new object
			-- field-by-field identical to other.
			-- Always uses default copying semantics.
			-- (from ANY)
		do
			if other /= Void then
				Result := other.standard_twin
			end
		ensure -- from ANY
			instance_free: class
			equal: standard_equal (Result, other)
		end

	frozen standard_copy (other: THREAD_ATTRIBUTES)
			-- 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)
		external
			"built_in"
		ensure -- from ANY
			is_standard_equal: standard_is_equal (other)
		end

	frozen standard_twin: THREAD_ATTRIBUTES
			-- New object field-by-field identical to other.
			-- Always uses default copying semantics.
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			standard_twin_not_void: Result /= Void
			equal: standard_equal (Result, Current)
		end

	frozen twin: THREAD_ATTRIBUTES
			-- New object equal to Current
			-- twin calls copy; to change copying/twinning semantics, redefine copy.
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			twin_not_void: Result /= Void
			is_equal: Result ~ Current
		end
	
feature -- Basic operations

	frozen as_attached: attached THREAD_ATTRIBUTES
		obsolete "Remove calls to this feature. [2017-05-31]"
			-- Attached version of Current.
			-- (Can be used during transitional period to convert
			-- non-void-safe classes to void-safe ones.)
			-- (from ANY)
		do
			Result := Current
		end

	frozen default: detachable THREAD_ATTRIBUTES
			-- Default value of object's type
			-- (from ANY)
		do
		end

	frozen default_pointer: POINTER
			-- Default value of type POINTER
			-- (Avoid the need to write p.default for
			-- some p of type POINTER.)
			-- (from ANY)
		do
		ensure -- from ANY
			instance_free: class
		end

	default_rescue
			-- Process exception for routines with no Rescue clause.
			-- (Default: do nothing.)
			-- (from ANY)
		do
		end

	frozen do_nothing
			-- Execute a null action.
			-- (from ANY)
		do
		ensure -- from ANY
			instance_free: class
		end
	
feature {NONE} -- Implementation

	c_priority (p: POINTER): like priority
		external
			"C inline use %"eif_eiffel.h%""
		alias
			"[
				#ifdef EIF_THREADS
					return (EIF_INTEGER) (((EIF_THR_ATTR_TYPE *) $p)->priority);
				#else
					return 0L;
				#endif
			]"
		end

	c_set_priority (p: POINTER; v: like priority)
		external
			"C inline use %"eif_eiffel.h%""
		alias
			"[
				#ifdef EIF_THREADS
					((EIF_THR_ATTR_TYPE *) $p)->priority = $v;
				#endif
			]"
		end

	c_set_stack_size (p: POINTER; v: like stack_size)
		external
			"C inline use %"eif_eiffel.h%""
		alias
			"[
				#ifdef EIF_THREADS
					((EIF_THR_ATTR_TYPE *) $p)->stack_size = $v;
				#endif
			]"
		end

	c_stack_size (p: POINTER): like stack_size
		external
			"C inline use %"eif_eiffel.h%""
		alias
			"[
				#ifdef EIF_THREADS
					return ((EIF_THR_ATTR_TYPE *) $p)->stack_size;
				#else
					return 0L;
				#endif
			]"
		end

	internal_item: POINTER
			-- Pointer holding value when shared.
			-- (from MEMORY_STRUCTURE)

	managed_pointer: detachable MANAGED_POINTER
			-- Hold memory area in a managed way.
			-- (from MEMORY_STRUCTURE)
	
feature -- Implementation

	structure_size: INTEGER_32
			-- Size to allocate (in bytes).
		external
			"C inline use %"eif_eiffel.h%""
		alias
			"[
				#ifdef EIF_THREADS
					return sizeof(EIF_THR_ATTR_TYPE);
				#else
					return 1L;
				#endif
			]"
		ensure -- from MEMORY_STRUCTURE
			is_class: class
			positive_result: Result > 0
		end
	
feature -- Attribute change

	set_priority (prio: like priority)
			-- Set thread priority to prio.
		require
			valid_priority: (prio >= min_priority) and (prio <= max_priority)
		do
			c_set_priority (item, prio)
		ensure
			priority_set: priority = prio
		end

	set_stack_size (s: like stack_size)
			-- Set stack_size to s.
		do
			c_set_stack_size (item, stack_size)
		ensure
			stack_size_set: stack_size = s
		end
	
feature -- Obsolete: Not applicable

	default_policy: INTEGER_32
		obsolete "Removed because calls where not portable. [2017-05-31]"
		do
			Result := 0
		end

	detached: BOOLEAN
		obsolete "Removed because calls where not portable. [2017-05-31]"
		do
		end

	fifo: INTEGER_32
		obsolete "Removed because calls where not portable. [2017-05-31]"
		do
			Result := 2
		end

	other: INTEGER_32
		obsolete "Removed because calls where not portable. [2017-05-31]"
		do
			Result := 1
		end

	round_robin: INTEGER_32
		obsolete "Removed because calls where not portable. [2017-05-31]"
		do
			Result := 3
		end

	scheduling_policy: INTEGER_32
		obsolete "Removed because calls where not portable. [2017-05-31]"
		do
		end

	set_detached (bool: BOOLEAN)
		obsolete "Removed because now threads are always started detached. [2017-05-31]"
			-- Set the detached state of the thread attribute to bool. If
			-- bool is True (default), the thread will be created detached
			-- on the C level. You can always join a thread, even if it was
			-- created detached. This only affects the C join().
		do
		end

	set_policy (policy: INTEGER_32)
		obsolete "Removed because calls where not portable. [2017-05-31]"
			-- Set scheduling policy to policy.  Possible values are:
			-- default_policy, other, fifo and round_robin.
		require
			valid_policy: (policy >= default_policy) and (policy <= round_robin)
		do
		end
	
feature -- Output

	Io: STD_FILES
			-- Handle to standard file setup
			-- (from ANY)
		once
			create Result;
			Result.set_output_default
		ensure -- from ANY
			instance_free: class
			io_not_void: Result /= Void
		end

	out: STRING_8
			-- New string containing terse printable representation
			-- of current object
			-- (from ANY)
		do
			Result := tagged_out
		ensure -- from ANY
			out_not_void: Result /= Void
		end

	print (o: detachable ANY)
			-- Write terse external representation of o
			-- on standard output.
			-- (from ANY)
		local
			s: READABLE_STRING_8
		do
			if attached o then
				s := o.out
				if attached {READABLE_STRING_32} s as s32 then
					Io.put_string_32 (s32)
				elseif attached {READABLE_STRING_8} s as s8 then
					Io.put_string (s8)
				else
					Io.put_string_32 (s.as_string_32)
				end
			end
		ensure -- from ANY
			instance_free: class
		end

	frozen tagged_out: STRING_8
			-- New string containing terse printable representation
			-- of current object
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			tagged_out_not_void: Result /= Void
		end
	
feature -- Platform

	Operating_environment: OPERATING_ENVIRONMENT
			-- Objects available from the operating system
			-- (from ANY)
		once
			create Result
		ensure -- from ANY
			instance_free: class
			operating_environment_not_void: Result /= Void
		end
	
feature {NONE} -- Retrieval

	frozen internal_correct_mismatch
			-- Called from runtime to perform a proper dynamic dispatch on correct_mismatch
			-- from MISMATCH_CORRECTOR.
			-- (from ANY)
		local
			l_msg: STRING_32
			l_exc: EXCEPTIONS
		do
			if attached {MISMATCH_CORRECTOR} Current as l_corrector then
				l_corrector.correct_mismatch
			else
				create l_msg.make_from_string ("Mismatch: ".as_string_32)
				create l_exc;
				l_msg.append (generating_type.name_32);
				l_exc.raise_retrieval_exception (l_msg)
			end
		end
	
invariant
	priority_bounded: min_priority <= priority and priority <= max_priority

		-- from ANY
	reflexive_equality: standard_is_equal (Current)
	reflexive_conformance: conforms_to (Current)

		-- from MEMORY_STRUCTURE
	managed_pointer_valid: not shared implies managed_pointer /= Void
	internal_item_valid: shared implies internal_item /= default_pointer

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 -- class THREAD_ATTRIBUTES

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