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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 -- -- -- -- Copyright (C) 1992-2009, 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 3, 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. -- -- -- -- As a special exception under Section 7 of GPL version 3, you are granted -- -- additional permissions described in the GCC Runtime Library Exception, -- -- version 3.1, as published by the Free Software Foundation. -- -- -- -- You should have received a copy of the GNU General Public License and -- -- a copy of the GCC Runtime Library Exception along with this program; -- -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- -- <http://www.gnu.org/licenses/>. -- -- -- -- 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 and use 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. -- This unit may be used directly from an application program by providing -- an appropriate WITH, and the interface can be expected to remain stable. -- This is the Solaris (native) version of this module with System.OS_Interface; package System.Task_Info is pragma Preelaborate; 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 Unspecified_Task_Info 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; Unspecified_Task_Info : constant Task_Info_Type := null; end System.Task_Info;