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- ------------------------------------------------------------------------------
- -- --
- -- 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;
-