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