111
|
1 ------------------------------------------------------------------------------
|
|
2 -- --
|
|
3 -- GNAT COMPILER COMPONENTS --
|
|
4 -- --
|
|
5 -- S Y S T E M . T A S K _ I N F O --
|
|
6 -- --
|
|
7 -- S p e c --
|
|
8 -- --
|
145
|
9 -- Copyright (C) 2007-2019, Free Software Foundation, Inc. --
|
111
|
10 -- --
|
|
11 -- GNAT is free software; you can redistribute it and/or modify it under --
|
|
12 -- terms of the GNU General Public License as published by the Free Soft- --
|
|
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
|
|
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
|
|
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
|
|
16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
|
|
17 -- --
|
|
18 -- As a special exception under Section 7 of GPL version 3, you are granted --
|
|
19 -- additional permissions described in the GCC Runtime Library Exception, --
|
|
20 -- version 3.1, as published by the Free Software Foundation. --
|
|
21 -- --
|
|
22 -- You should have received a copy of the GNU General Public License and --
|
|
23 -- a copy of the GCC Runtime Library Exception along with this program; --
|
|
24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
|
|
25 -- <http://www.gnu.org/licenses/>. --
|
|
26 -- --
|
|
27 -- GNAT was originally developed by the GNAT team at New York University. --
|
|
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
|
|
29 -- --
|
|
30 ------------------------------------------------------------------------------
|
|
31
|
|
32 -- This package contains the definitions and routines associated with the
|
|
33 -- implementation and use of the Task_Info pragma. It is specialized
|
|
34 -- appropriately for targets that make use of this pragma.
|
|
35
|
|
36 -- Note: the compiler generates direct calls to this interface, via Rtsfind.
|
|
37 -- Any changes to this interface may require corresponding compiler changes.
|
|
38
|
|
39 -- The functionality in this unit is now provided by the predefined package
|
|
40 -- System.Multiprocessors and the CPU aspect. This package is obsolescent.
|
|
41
|
|
42 -- This is the Windows (native) version of this module
|
|
43
|
|
44 with System.Win32;
|
|
45
|
|
46 package System.Task_Info is
|
|
47 pragma Obsolescent (Task_Info, "use System.Multiprocessors and CPU aspect");
|
|
48 pragma Preelaborate;
|
|
49 pragma Elaborate_Body;
|
|
50 -- To ensure that a body is allowed
|
|
51
|
|
52 use type System.Win32.ProcessorId;
|
|
53
|
|
54 -- Windows provides a way to define the ideal processor to use for a given
|
|
55 -- thread. The ideal processor is not necessarily the one that will be used
|
|
56 -- by the OS but the OS will always try to schedule this thread to the
|
|
57 -- specified processor if it is available.
|
|
58
|
|
59 -- The Task_Info pragma:
|
|
60
|
|
61 -- pragma Task_Info (EXPRESSION);
|
|
62
|
|
63 -- allows the specification on a task by task basis of a value of type
|
|
64 -- System.Task_Info.Task_Info_Type to be passed to a task when it is
|
|
65 -- created. The specification of this type, and the effect on the task
|
|
66 -- that is created is target dependent.
|
|
67
|
|
68 -- The Task_Info pragma appears within a task definition (compare the
|
|
69 -- definition and implementation of pragma Priority). If no such pragma
|
|
70 -- appears, then the value Unspecified_Task_Info is passed. If a pragma
|
|
71 -- is present, then it supplies an alternative value. If the argument of
|
|
72 -- the pragma is a discriminant reference, then the value can be set on
|
|
73 -- a task by task basis by supplying the appropriate discriminant value.
|
|
74
|
|
75 -- Note that this means that the type used for Task_Info_Type must be
|
|
76 -- suitable for use as a discriminant (i.e. a scalar or access type).
|
|
77
|
|
78 -----------------------
|
|
79 -- Thread Attributes --
|
|
80 -----------------------
|
|
81
|
|
82 subtype CPU_Number is System.Win32.ProcessorId;
|
|
83
|
|
84 Any_CPU : constant CPU_Number := -1;
|
|
85
|
|
86 Invalid_CPU_Number : exception;
|
|
87 -- Raised when an invalid CPU number has been specified
|
|
88 -- i.e. CPU > Number_Of_Processors.
|
|
89
|
|
90 type Thread_Attributes is record
|
|
91 CPU : CPU_Number := Any_CPU;
|
|
92 end record;
|
|
93
|
|
94 Default_Thread_Attributes : constant Thread_Attributes := (others => <>);
|
|
95
|
|
96 type Task_Info_Type is access all Thread_Attributes;
|
|
97
|
|
98 Unspecified_Task_Info : constant Task_Info_Type := null;
|
|
99
|
|
100 function Number_Of_Processors return Positive;
|
|
101 -- Returns the number of processors on the running host
|
|
102
|
|
103 end System.Task_Info;
|