home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
ADA Programming Guide
/
ADA Programming Guide.iso
/
ada_gnu
/
adainc
/
s-taspri.ads
< prev
next >
Wrap
Text File
|
1996-01-30
|
6KB
|
160 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: 1.12 $ --
-- --
-- Copyright (c) 1991,1992,1993,1994, 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.LIB. If not, write to the Free Software Foundation, 675 --
-- Mass Ave, Cambridge, MA 02139, USA. --
-- --
------------------------------------------------------------------------------
with Interfaces.C;
-- Used for Size_t;
with Interfaces.C.Pthreads;
-- Used for, size_t,
-- pthread_mutex_t,
-- pthread_cond_t,
-- pthread_t
with Interfaces.C.POSIX_RTE;
-- Used for, Signal,
-- siginfo_ptr,
with System.Task_Clock;
-- Used for, Stimespec
with Unchecked_Conversion;
pragma Elaborate_All (Interfaces.C.Pthreads);
package System.Task_Primitives is
-- Low level Task size and state definition
type LL_Task_Procedure_Access is access procedure (Arg : System.Address);
type Pre_Call_State is new System.Address;
type Task_Storage_Size is new Interfaces.C.size_t;
type Machine_Exceptions is new Interfaces.C.POSIX_RTE.Signal;
type Error_Information is new Interfaces.C.POSIX_RTE.siginfo_ptr;
type Lock is new Interfaces.C.Pthreads.pthread_mutex_t;
type Condition_Variable is new Interfaces.C.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 : LL_Task_Procedure_Access;
LL_Arg : System.Address;
Thread : Interfaces.C.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.
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; Ceiling_Violation : out Boolean);
procedure Read_Lock (L : in out Lock; Ceiling_Violation : out Boolean);
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 : LL_Task_Procedure_Access;
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 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;