Mercurial > hg > CbC > CbC_gcc
comparison gcc/ada/libgnarl/s-tasinf__linux.ads @ 111:04ced10e8804
gcc 7
| author | kono |
|---|---|
| date | Fri, 27 Oct 2017 22:46:09 +0900 |
| parents | |
| children | 84e7813d76e9 |
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| 68:561a7518be6b | 111:04ced10e8804 |
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| 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 -- -- | |
| 9 -- Copyright (C) 2007-2017, Free Software Foundation, Inc. -- | |
| 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 GNU/Linux version of this module | |
| 43 | |
| 44 with System.OS_Interface; | |
| 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 -- The Linux kernel provides a way to define the ideal processor to use for | |
| 53 -- a given thread. The ideal processor is not necessarily the one that will | |
| 54 -- be used by the OS but the OS will always try to schedule this thread to | |
| 55 -- the specified processor if it is available. | |
| 56 | |
| 57 -- The Task_Info pragma: | |
| 58 | |
| 59 -- pragma Task_Info (EXPRESSION); | |
| 60 | |
| 61 -- allows the specification on a task by task basis of a value of type | |
| 62 -- System.Task_Info.Task_Info_Type to be passed to a task when it is | |
| 63 -- created. The specification of this type, and the effect on the task | |
| 64 -- that is created is target dependent. | |
| 65 | |
| 66 -- The Task_Info pragma appears within a task definition (compare the | |
| 67 -- definition and implementation of pragma Priority). If no such pragma | |
| 68 -- appears, then the value Unspecified_Task_Info is passed. If a pragma | |
| 69 -- is present, then it supplies an alternative value. If the argument of | |
| 70 -- the pragma is a discriminant reference, then the value can be set on | |
| 71 -- a task by task basis by supplying the appropriate discriminant value. | |
| 72 | |
| 73 -- Note that this means that the type used for Task_Info_Type must be | |
| 74 -- suitable for use as a discriminant (i.e. a scalar or access type). | |
| 75 | |
| 76 ----------------------- | |
| 77 -- Thread Attributes -- | |
| 78 ----------------------- | |
| 79 | |
| 80 subtype CPU_Set is System.OS_Interface.cpu_set_t; | |
| 81 | |
| 82 Any_CPU : constant CPU_Set := (bits => (others => True)); | |
| 83 No_CPU : constant CPU_Set := (bits => (others => False)); | |
| 84 | |
| 85 Invalid_CPU_Number : exception; | |
| 86 -- Raised when an invalid CPU mask has been specified | |
| 87 -- i.e. An empty CPU set | |
| 88 | |
| 89 type Thread_Attributes is record | |
| 90 CPU_Affinity : aliased CPU_Set := Any_CPU; | |
| 91 end record; | |
| 92 | |
| 93 Default_Thread_Attributes : constant Thread_Attributes := (others => <>); | |
| 94 | |
| 95 type Task_Info_Type is access all Thread_Attributes; | |
| 96 | |
| 97 Unspecified_Task_Info : constant Task_Info_Type := null; | |
| 98 | |
| 99 function Number_Of_Processors return Positive; | |
| 100 -- Returns the number of processors on the running host | |
| 101 | |
| 102 end System.Task_Info; |