+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNAT COMPILER COMPONENTS --
--- --
--- S Y S T E M . T A S K _ I N F O --
--- --
--- S p e c --
--- --
--- $Revision: 1.1.16.1 $
--- --
--- 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.
-
--- This is the Solaris (native) version of this module.
-
-with System.OS_Interface;
-with Unchecked_Deallocation;
-package System.Task_Info is
-pragma Elaborate_Body;
--- To ensure that a body is allowed
-
- -----------------------------------------------------
- -- Binding of Tasks to LWPs and LWPs to processors --
- -----------------------------------------------------
-
- -- The Solaris implementation of the GNU Low-Level Interface (GNULLI)
- -- implements each Ada task as a Solaris thread. The Solaris thread
- -- library distributes threads across one or more LWPs (Light Weight
- -- Process) that are members of the same process. Solaris distributes
- -- processes and LWPs across the available CPUs on a given machine. The
- -- pragma Task_Info provides the mechanism to control the distribution
- -- of tasks to LWPs, and LWPs to processors.
-
- -- Each thread has a number of attributes that dictate it's scheduling.
- -- These attributes are:
- --
- -- New_LWP: whether a new LWP is created for this thread.
- --
- -- Bound_To_LWP: whether the thread is bound to a specific LWP
- -- for its entire lifetime.
- --
- -- CPU: the CPU number associated to the LWP
- --
-
- -- The Task_Info pragma:
-
- -- pragma Task_Info (EXPRESSION);
-
- -- allows the specification on a task by task basis of a value of type
- -- System.Task_Info.Task_Info_Type to be passed to a task when it is
- -- created. The specification of this type, and the effect on the task
- -- that is created is target dependent.
-
- -- The Task_Info pragma appears within a task definition (compare the
- -- definition and implementation of pragma Priority). If no such pragma
- -- appears, then the value Task_Info_Unspecified is passed. If a pragma
- -- is present, then it supplies an alternative value. If the argument of
- -- the pragma is a discriminant reference, then the value can be set on
- -- a task by task basis by supplying the appropriate discriminant value.
-
- -- Note that this means that the type used for Task_Info_Type must be
- -- suitable for use as a discriminant (i.e. a scalar or access type).
-
- -----------------------
- -- Thread Attributes --
- -----------------------
-
- subtype CPU_Number is System.OS_Interface.processorid_t;
-
- CPU_UNCHANGED : constant CPU_Number := System.OS_Interface.PBIND_QUERY;
- -- Do not bind the LWP to a specific processor
-
- ANY_CPU : constant CPU_Number := System.OS_Interface.PBIND_NONE;
- -- Bind the LWP to any processor
-
- Invalid_CPU_Number : exception;
-
- type Thread_Attributes (New_LWP : Boolean) is record
- Bound_To_LWP : Boolean := True;
- case New_LWP is
- when False =>
- null;
- when True =>
- CPU : CPU_Number := CPU_UNCHANGED;
- end case;
- end record;
-
- Default_Thread_Attributes : constant Thread_Attributes := (False, True);
-
- function Unbound_Thread_Attributes
- return Thread_Attributes;
-
- function Bound_Thread_Attributes
- return Thread_Attributes;
-
- function Bound_Thread_Attributes (CPU : CPU_Number)
- return Thread_Attributes;
-
- type Task_Info_Type is access all Thread_Attributes;
-
- function New_Unbound_Thread_Attributes
- return Task_Info_Type;
-
- function New_Bound_Thread_Attributes
- return Task_Info_Type;
-
- function New_Bound_Thread_Attributes (CPU : CPU_Number)
- return Task_Info_Type;
-
- 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;
-
-end System.Task_Info;
projects / msp430-gcc.git / blobdiff