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1994-05-19
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169 lines
------------------------------------------------------------------------------
-- --
-- GNU ADA RUNTIME LIBRARY (GNARL) COMPONENTS --
-- --
-- S Y S T E M . T A S K _ P R I M I T I V E S --
-- --
-- S p e c --
-- --
-- $Revision: 1.5 $ --
-- --
-- Copyright (c) 1991,1992,1993, FSU, All Rights Reserved --
-- --
-- GNARL is free software; you can redistribute it and/or modify it under --
-- terms of the GNU Library General Public License as published by the --
-- Free Software Foundation; either version 2, or (at your option) any --
-- later version. GNARL is distributed in the hope that it will be use- --
-- ful, but but WITHOUT ANY WARRANTY; without even the implied warranty of --
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Gen- --
-- eral Library Public License for more details. You should have received --
-- a copy of the GNU Library General Public License along with GNARL; see --
-- file COPYING. If not, write to the Free Software Foundation, 675 Mass --
-- Ave, Cambridge, MA 02139, USA. --
-- --
------------------------------------------------------------------------------
with System.Pthreads; use System.Pthreads;
with System.POSIX_RTE; use System.POSIX_RTE;
with System.Task_Clock; use System.Task_Clock;
with Unchecked_Conversion;
package System.Task_Primitives is
-- Low level Task size and state definition
type Init_State is access procedure (Arg : System.Address);
-- Following should be removed later ???
type dummy is record
d : integer;
end record;
type Pre_Call_State is access dummy;
-- type Pre_Call_State is new System.Address; ???
type Task_Storage_Size is new Pthreads.size_t;
type Interrupt_ID is new POSIX_RTE.Signal;
type Interrupt_Info is new POSIX_RTE.siginfo_ptr;
type Machine_Exceptions is new POSIX_RTE.Signal;
type Error_Information is new POSIX_RTE.siginfo_ptr;
type Lock is new Pthreads.pthread_mutex_t;
type Condition_Variable is new Pthreads.pthread_cond_t;
-- These definitions has to be private ???
-- type Lock is private;
-- type Condition_Variable is private;
-- The above types should both be limited. They are not due to a hack in
-- ATCB allocation which allocates a block of the correct size and then
-- assigns an initalizized ATCB to it. This won't work with limited types.
-- When allocation is done with new, these can become limited once again.
-- ???
type Task_Control_Block is record
LL_Entry_Point : Init_State;
LL_Arg : System.Address;
Thread : Pthreads.pthread_t;
Stack_Size : Task_Storage_Size;
Stack_Limit : System.Address;
end record;
type TCB_Ptr is access Task_Control_Block;
-- Task ATCB related and variables.
Test_And_Set_Mutex : Lock;
-- Use a mutex to simulate test-and-set. This is ridiculously inefficient;
-- it is just here so that I can fix the syntax errors without having to
-- worry about how to get machine code into the system in the absense
-- of machine code inserts.
function Address_To_TCB_Ptr is new
Unchecked_Conversion (System.Address, TCB_Ptr);
procedure Initialize_LL_Tasks (T : TCB_Ptr);
function Self return TCB_Ptr;
procedure Initialize_Lock (Prio : System.Priority; L : in out Lock);
procedure Finalize_Lock (L : in out Lock);
procedure Write_Lock (L : in out Lock);
procedure Read_Lock (L : in out Lock);
procedure Unlock (L : in out Lock);
procedure Initialize_Cond (Cond : in out Condition_Variable);
procedure Finalize_Cond (Cond : in out Condition_Variable);
procedure Cond_Wait (Cond : in out Condition_Variable; L : in out Lock);
procedure Cond_Timed_Wait
(Cond : in out Condition_Variable;
L : in out Lock; Abs_Time : Task_Clock.Stimespec;
Timed_Out : out Boolean);
procedure Cond_Signal (Cond : in out Condition_Variable);
procedure Cond_Broadcast (Cond : in out Condition_Variable);
procedure Set_Priority (T : TCB_Ptr; Prio : System.Priority);
procedure Set_Own_Priority (Prio : System.Priority);
function Get_Priority (T : TCB_Ptr) return System.Priority;
function Get_Own_Priority return System.Priority;
procedure Create_LL_Task
(Priority : System.Priority;
Stack_Size : Task_Storage_Size;
LL_Entry_Point : Init_State;
Arg : System.Address;
T : TCB_Ptr);
procedure Exit_LL_Task;
procedure Abort_Task (T : TCB_Ptr);
procedure Test_Abort;
type Abort_Handler_Pointer is access procedure (Context : Pre_Call_State);
procedure Install_Abort_Handler (Handler : Abort_Handler_Pointer);
procedure Install_Error_Handler (Handler : System.Address);
procedure Signal_Task (T : TCB_Ptr; Int_Id : Interrupt_ID);
procedure Wait_For_Signal (Int_Id : Interrupt_ID);
function Reserved_Signal (Int_Id : Interrupt_ID) return Boolean;
procedure LL_Assert (B : Boolean; M : String);
Task_Wrapper_Frame : constant Integer := 72;
-- This is the size of the frame for the Pthread_Wrapper procedure.
type Proc is access procedure (Addr : System.Address);
procedure Test_And_Set (Flag_Add : System.Address; Result : out Boolean);
-- Flag_Add is the address of a variable of type Boolean
-- private
-- type Lock is new Pthreads.pthread_mutex_t; ???
-- type Condition_Variable is new Pthreads.pthread_cond_t; ???
end System.Task_Primitives;