143 lines
6.5 KiB
Ada
143 lines
6.5 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- S Y S T E M . T A S K _ I N F O --
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-- --
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-- S p e c --
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-- (Compiler Interface) --
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-- --
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-- $Revision: 1.1 $
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-- --
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-- Copyright (C) 1992-2000 Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 2, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING. If not, write --
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-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
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-- MA 02111-1307, USA. --
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-- --
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-- As a special exception, if other files instantiate generics from this --
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-- unit, or you link this unit with other files to produce an executable, --
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-- this unit does not by itself cause the resulting executable to be --
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-- covered by the GNU General Public License. This exception does not --
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-- however invalidate any other reasons why the executable file might be --
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-- covered by the GNU Public License. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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-- This package contains the definitions and routines associated with the
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-- implementation of the Task_Info pragma. It is specialized appropriately
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-- for targets that make use of this pragma.
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-- Note: the compiler generates direct calls to this interface, via Rtsfind.
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-- Any changes to this interface may require corresponding compiler changes.
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with Interfaces.C;
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with System.OS_Interface;
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with Unchecked_Deallocation;
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package System.Task_Info is
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pragma Elaborate_Body;
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-- To ensure that a body is allowed
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package OSI renames System.OS_Interface;
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-----------------------------------------
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-- Implementation of Task_Info Feature --
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-----------------------------------------
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-- Pragma Task_Info allows an application to set the underlying
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-- pthread scheduling attributes for a specific task.
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------------------
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-- Declarations --
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------------------
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type Thread_Scheduling_Scope is
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(PTHREAD_SCOPE_PROCESS, PTHREAD_SCOPE_SYSTEM);
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for Thread_Scheduling_Scope'Size use Interfaces.C.int'Size;
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type Thread_Scheduling_Inheritance is
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(PTHREAD_EXPLICIT_SCHED, PTHREAD_INHERIT_SCHED);
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for Thread_Scheduling_Inheritance'Size use Interfaces.C.int'Size;
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type Thread_Scheduling_Policy is
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(SCHED_FIFO, -- The first-in-first-out real-time policy
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SCHED_RR, -- The round-robin real-time scheduling policy
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SCHED_TS); -- The timeshare earnings based scheduling policy
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for Thread_Scheduling_Policy'Size use Interfaces.C.int'Size;
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for Thread_Scheduling_Policy use
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(SCHED_FIFO => 1,
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SCHED_RR => 2,
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SCHED_TS => 3);
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function SCHED_OTHER return Thread_Scheduling_Policy renames SCHED_TS;
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No_Specified_Priority : constant := -1;
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subtype Thread_Scheduling_Priority is Integer range
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No_Specified_Priority .. 255;
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function Min (Policy : Interfaces.C.int) return Interfaces.C.int
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renames OSI.sched_get_priority_min;
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function Max (Policy : Interfaces.C.int) return Interfaces.C.int
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renames OSI.sched_get_priority_max;
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subtype FIFO_Priority is Thread_Scheduling_Priority range
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Thread_Scheduling_Priority (Min (OSI.SCHED_FIFO)) ..
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Thread_Scheduling_Priority (Max (OSI.SCHED_FIFO));
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subtype RR_Priority is Thread_Scheduling_Priority range
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Thread_Scheduling_Priority (Min (OSI.SCHED_RR)) ..
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Thread_Scheduling_Priority (Max (OSI.SCHED_RR));
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subtype TS_Priority is Thread_Scheduling_Priority range
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Thread_Scheduling_Priority (Min (OSI.SCHED_TS)) ..
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Thread_Scheduling_Priority (Max (OSI.SCHED_TS));
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subtype OTHER_Priority is Thread_Scheduling_Priority range
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Thread_Scheduling_Priority (Min (OSI.SCHED_OTHER)) ..
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Thread_Scheduling_Priority (Max (OSI.SCHED_OTHER));
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subtype CPU_Number is Integer range -1 .. Integer'Last;
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ANY_CPU : constant CPU_Number := CPU_Number'First;
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type Thread_Attributes is record
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Scope : Thread_Scheduling_Scope := PTHREAD_SCOPE_PROCESS;
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Inheritance : Thread_Scheduling_Inheritance := PTHREAD_EXPLICIT_SCHED;
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Policy : Thread_Scheduling_Policy := SCHED_RR;
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Priority : Thread_Scheduling_Priority := No_Specified_Priority;
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Runon_CPU : CPU_Number := ANY_CPU;
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end record;
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Default_Thread_Attributes : constant Thread_Attributes :=
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(PTHREAD_SCOPE_PROCESS, PTHREAD_EXPLICIT_SCHED, SCHED_RR,
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No_Specified_Priority, ANY_CPU);
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type Task_Info_Type is access all Thread_Attributes;
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type Task_Image_Type is access String;
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-- Used to generate a meaningful identifier for tasks that are variables
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-- and components of variables.
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procedure Free_Task_Image is new
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Unchecked_Deallocation (String, Task_Image_Type);
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Unspecified_Task_Info : constant Task_Info_Type := null;
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-- Value passed to task in the absence of a Task_Info pragma
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end System.Task_Info;
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