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------------------------------------------------------------------------------
-- --
-- FLORIST (FSU Implementation of POSIX.5) COMPONENTS --
-- --
-- P O S I X . P R O C E S S _ S C H E D U L I N G --
-- --
-- S p e c --
-- --
-- --
-- This file is a component of FLORIST, an implementation of the POSIX --
-- Ada bindings for use with the GNAT Ada compiler and the FSU Gnu Ada --
-- Runtime Library (GNARL). --
-- --
-- This package specification contains some text extracted from IEEE STD --
-- 1003.5: 1990, Information Technology -- POSIX Ada Language Interfaces --
-- Part 1: Binding for System Application Program Interface, as amended --
-- by IEEE STD 1003.5b: 1996, Amendment 1: Realtime Extensions, copyright --
-- 1996 by the Institute of Electrical and Electronics Engineers, Inc. --
-- --
-- The package specifications in the IEEE standards cited above represent --
-- only a portion of the documents and are not to be interpreteted --
-- outside the context of the documents. The standards must be used in --
-- conjunction with the package specifications in order to claim --
-- conformance. The IEEE takes no responsibility for and will assume no --
-- liability for damages resulting from the reader's misinterpretation of --
-- said information resulting from its out-of-context nature. To order --
-- copies of the IEEE standards, please contact the IEEE Service Center --
-- at 445 Hoes Lane, PO Box 1331, Piscataway, NJ 08855-1331; via phone at --
-- 1-800-678-IEEE, 908-981-1393; or via fax at 908-981-9667. --
-- --
-- These package specifications are distributed in the hope that they --
-- will be useful, but WITHOUT ANY WARRANTY; without even the implied --
-- warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
------------------------------------------------------------------------------
with POSIX.C,
POSIX_Process_Identification;
package POSIX.Process_Scheduling is
subtype Scheduling_Priority is Integer;
type Scheduling_Parameters is private;
function Get_Priority (Parameters : Scheduling_Parameters)
return Scheduling_Priority;
procedure Set_Priority
(Parameters : in out Scheduling_Parameters;
Priority : Scheduling_Priority);
type Scheduling_Policy is new Integer;
-- One might consider auto-configuring
-- the upper and lower bounds of this range to more tightly fit
-- the range of values supported by the underlying OS.
-- However, that would not help much. For example, LynxOS is
-- reputed to have the following values:
-- Sched_Fifo : constant := 2097152;
-- Sched_Other : constant := 4194304;
-- Sched_Rr : constant := 1048576;
-- Also, we should not limit it to the just three values shown below,
-- because we might want to use these interfaces with implementation
-- defined policies.
Sched_FIFO : constant Scheduling_Policy := POSIX.C.SCHED_FIFO;
Sched_RR : constant Scheduling_Policy := POSIX.C.SCHED_RR;
Sched_Other : constant Scheduling_Policy := POSIX.C.SCHED_OTHER;
procedure Set_Scheduling_Parameters
(Process : POSIX_Process_Identification.Process_ID;
Parameters : Scheduling_Parameters);
function Get_Scheduling_Parameters
(Process : POSIX_Process_Identification.Process_ID)
return Scheduling_Parameters;
procedure Set_Scheduling_Policy
(Process : POSIX_Process_Identification.Process_ID;
New_Policy : Scheduling_Policy;
Parameters : Scheduling_Parameters);
function Get_Scheduling_Policy
(Process : POSIX_Process_Identification.Process_ID)
return Scheduling_Policy;
procedure Yield;
function Get_Maximum_Priority (Policy : Scheduling_Policy)
return Scheduling_Priority;
function Get_Minimum_Priority (Policy : Scheduling_Policy)
return Scheduling_Priority;
function Get_Round_Robin_Interval
(Process : POSIX_Process_Identification.Process_ID)
return POSIX.Timespec;
private
type Scheduling_Parameters is record
Param : aliased POSIX.C.struct_sched_param;
end record;
end POSIX.Process_Scheduling;
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