------------------------------------------------------------------------------ -- -- -- 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;