1277 lines
35 KiB
Ada
1277 lines
35 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
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-- --
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-- S Y S T E M . T A S K _ P R I M I T I V E S . O P E R A T I O N S --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1992-2009, Free Software Foundation, Inc. --
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-- --
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-- GNARL is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNARL was developed by the GNARL team at Florida State University. --
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-- Extensive contributions were provided by Ada Core Technologies, Inc. --
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-- --
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------------------------------------------------------------------------------
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-- This is a OpenVMS/Alpha version of this package
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-- This package contains all the GNULL primitives that interface directly with
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-- the underlying OS.
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pragma Polling (Off);
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-- Turn off polling, we do not want ATC polling to take place during tasking
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-- operations. It causes infinite loops and other problems.
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with Ada.Unchecked_Conversion;
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with Ada.Unchecked_Deallocation;
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with Interfaces.C;
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with System.Tasking.Debug;
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with System.OS_Primitives;
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with System.Soft_Links;
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with System.Aux_DEC;
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package body System.Task_Primitives.Operations is
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use System.Tasking.Debug;
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use System.Tasking;
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use Interfaces.C;
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use System.OS_Interface;
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use System.Parameters;
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use System.OS_Primitives;
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use type System.OS_Primitives.OS_Time;
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package SSL renames System.Soft_Links;
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----------------
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-- Local Data --
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----------------
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-- The followings are logically constants, but need to be initialized
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-- at run time.
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Single_RTS_Lock : aliased RTS_Lock;
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-- This is a lock to allow only one thread of control in the RTS at
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-- a time; it is used to execute in mutual exclusion from all other tasks.
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-- Used mainly in Single_Lock mode, but also to protect All_Tasks_List
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ATCB_Key : aliased pthread_key_t;
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-- Key used to find the Ada Task_Id associated with a thread
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Environment_Task_Id : Task_Id;
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-- A variable to hold Task_Id for the environment task
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Time_Slice_Val : Integer;
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pragma Import (C, Time_Slice_Val, "__gl_time_slice_val");
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Dispatching_Policy : Character;
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pragma Import (C, Dispatching_Policy, "__gl_task_dispatching_policy");
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Foreign_Task_Elaborated : aliased Boolean := True;
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-- Used to identified fake tasks (i.e., non-Ada Threads)
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--------------------
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-- Local Packages --
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--------------------
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package Specific is
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procedure Initialize (Environment_Task : Task_Id);
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pragma Inline (Initialize);
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-- Initialize various data needed by this package
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function Is_Valid_Task return Boolean;
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pragma Inline (Is_Valid_Task);
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-- Does executing thread have a TCB?
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procedure Set (Self_Id : Task_Id);
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pragma Inline (Set);
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-- Set the self id for the current task
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function Self return Task_Id;
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pragma Inline (Self);
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-- Return a pointer to the Ada Task Control Block of the calling task
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end Specific;
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package body Specific is separate;
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-- The body of this package is target specific
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---------------------------------
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-- Support for foreign threads --
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---------------------------------
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function Register_Foreign_Thread (Thread : Thread_Id) return Task_Id;
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-- Allocate and Initialize a new ATCB for the current Thread
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function Register_Foreign_Thread
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(Thread : Thread_Id) return Task_Id is separate;
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-----------------------
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-- Local Subprograms --
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-----------------------
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function To_Task_Id is
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new Ada.Unchecked_Conversion
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(System.Task_Primitives.Task_Address, Task_Id);
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function To_Address is
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new Ada.Unchecked_Conversion
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(Task_Id, System.Task_Primitives.Task_Address);
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function Get_Exc_Stack_Addr return Address;
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-- Replace System.Soft_Links.Get_Exc_Stack_Addr_NT
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procedure Timer_Sleep_AST (ID : Address);
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pragma Convention (C, Timer_Sleep_AST);
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-- Signal the condition variable when AST fires
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procedure Timer_Sleep_AST (ID : Address) is
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Result : Interfaces.C.int;
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pragma Warnings (Off, Result);
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Self_ID : constant Task_Id := To_Task_Id (ID);
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begin
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Self_ID.Common.LL.AST_Pending := False;
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Result := pthread_cond_signal_int_np (Self_ID.Common.LL.CV'Access);
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pragma Assert (Result = 0);
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end Timer_Sleep_AST;
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-----------------
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-- Stack_Guard --
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-----------------
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-- The underlying thread system sets a guard page at the bottom of a thread
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-- stack, so nothing is needed.
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-- ??? Check the comment above
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procedure Stack_Guard (T : ST.Task_Id; On : Boolean) is
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pragma Unreferenced (T);
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pragma Unreferenced (On);
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begin
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null;
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end Stack_Guard;
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--------------------
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-- Get_Thread_Id --
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--------------------
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function Get_Thread_Id (T : ST.Task_Id) return OSI.Thread_Id is
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begin
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return T.Common.LL.Thread;
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end Get_Thread_Id;
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----------
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-- Self --
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----------
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function Self return Task_Id renames Specific.Self;
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---------------------
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-- Initialize_Lock --
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---------------------
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-- Note: mutexes and cond_variables needed per-task basis are initialized
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-- in Initialize_TCB and the Storage_Error is handled. Other mutexes (such
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-- as RTS_Lock, Memory_Lock...) used in RTS is initialized before any
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-- status change of RTS. Therefore raising Storage_Error in the following
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-- routines should be able to be handled safely.
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procedure Initialize_Lock
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(Prio : System.Any_Priority;
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L : not null access Lock)
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is
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Attributes : aliased pthread_mutexattr_t;
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Result : Interfaces.C.int;
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begin
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Result := pthread_mutexattr_init (Attributes'Access);
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pragma Assert (Result = 0 or else Result = ENOMEM);
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if Result = ENOMEM then
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raise Storage_Error;
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end if;
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L.Prio_Save := 0;
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L.Prio := Interfaces.C.int (Prio);
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Result := pthread_mutex_init (L.L'Access, Attributes'Access);
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pragma Assert (Result = 0 or else Result = ENOMEM);
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if Result = ENOMEM then
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raise Storage_Error;
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end if;
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Result := pthread_mutexattr_destroy (Attributes'Access);
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pragma Assert (Result = 0);
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end Initialize_Lock;
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procedure Initialize_Lock
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(L : not null access RTS_Lock;
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Level : Lock_Level)
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is
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pragma Unreferenced (Level);
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Attributes : aliased pthread_mutexattr_t;
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Result : Interfaces.C.int;
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begin
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Result := pthread_mutexattr_init (Attributes'Access);
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pragma Assert (Result = 0 or else Result = ENOMEM);
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if Result = ENOMEM then
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raise Storage_Error;
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end if;
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-- Don't use, see comment in s-osinte.ads about ERRORCHECK mutexes???
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-- Result := pthread_mutexattr_settype_np
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-- (Attributes'Access, PTHREAD_MUTEX_ERRORCHECK_NP);
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-- pragma Assert (Result = 0);
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-- Result := pthread_mutexattr_setprotocol
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-- (Attributes'Access, PTHREAD_PRIO_PROTECT);
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-- pragma Assert (Result = 0);
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-- Result := pthread_mutexattr_setprioceiling
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-- (Attributes'Access, Interfaces.C.int (System.Any_Priority'Last));
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-- pragma Assert (Result = 0);
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Result := pthread_mutex_init (L, Attributes'Access);
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pragma Assert (Result = 0 or else Result = ENOMEM);
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if Result = ENOMEM then
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raise Storage_Error;
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end if;
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Result := pthread_mutexattr_destroy (Attributes'Access);
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pragma Assert (Result = 0);
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end Initialize_Lock;
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-------------------
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-- Finalize_Lock --
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-------------------
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procedure Finalize_Lock (L : not null access Lock) is
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Result : Interfaces.C.int;
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begin
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Result := pthread_mutex_destroy (L.L'Access);
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pragma Assert (Result = 0);
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end Finalize_Lock;
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procedure Finalize_Lock (L : not null access RTS_Lock) is
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Result : Interfaces.C.int;
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begin
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Result := pthread_mutex_destroy (L);
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pragma Assert (Result = 0);
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end Finalize_Lock;
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----------------
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-- Write_Lock --
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----------------
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procedure Write_Lock
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(L : not null access Lock;
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Ceiling_Violation : out Boolean)
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is
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Self_ID : constant Task_Id := Self;
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All_Tasks_Link : constant Task_Id := Self.Common.All_Tasks_Link;
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Current_Prio : System.Any_Priority;
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Result : Interfaces.C.int;
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begin
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Current_Prio := Get_Priority (Self_ID);
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-- If there is no other tasks, no need to check priorities
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if All_Tasks_Link /= Null_Task
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and then L.Prio < Interfaces.C.int (Current_Prio)
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then
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Ceiling_Violation := True;
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return;
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end if;
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Result := pthread_mutex_lock (L.L'Access);
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pragma Assert (Result = 0);
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Ceiling_Violation := False;
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-- Why is this commented out ???
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-- L.Prio_Save := Interfaces.C.int (Current_Prio);
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-- Set_Priority (Self_ID, System.Any_Priority (L.Prio));
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end Write_Lock;
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procedure Write_Lock
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(L : not null access RTS_Lock;
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Global_Lock : Boolean := False)
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is
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Result : Interfaces.C.int;
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begin
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if not Single_Lock or else Global_Lock then
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Result := pthread_mutex_lock (L);
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pragma Assert (Result = 0);
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end if;
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end Write_Lock;
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procedure Write_Lock (T : Task_Id) is
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Result : Interfaces.C.int;
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begin
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if not Single_Lock then
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Result := pthread_mutex_lock (T.Common.LL.L'Access);
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pragma Assert (Result = 0);
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end if;
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end Write_Lock;
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---------------
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-- Read_Lock --
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---------------
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procedure Read_Lock
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(L : not null access Lock;
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Ceiling_Violation : out Boolean)
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is
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begin
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Write_Lock (L, Ceiling_Violation);
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end Read_Lock;
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------------
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-- Unlock --
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------------
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procedure Unlock (L : not null access Lock) is
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Result : Interfaces.C.int;
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begin
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Result := pthread_mutex_unlock (L.L'Access);
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pragma Assert (Result = 0);
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end Unlock;
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procedure Unlock
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(L : not null access RTS_Lock;
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Global_Lock : Boolean := False)
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is
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Result : Interfaces.C.int;
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begin
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if not Single_Lock or else Global_Lock then
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Result := pthread_mutex_unlock (L);
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pragma Assert (Result = 0);
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end if;
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end Unlock;
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procedure Unlock (T : Task_Id) is
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Result : Interfaces.C.int;
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begin
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if not Single_Lock then
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Result := pthread_mutex_unlock (T.Common.LL.L'Access);
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pragma Assert (Result = 0);
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end if;
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end Unlock;
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-----------------
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-- Set_Ceiling --
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-----------------
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-- Dynamic priority ceilings are not supported by the underlying system
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procedure Set_Ceiling
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(L : not null access Lock;
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Prio : System.Any_Priority)
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is
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pragma Unreferenced (L, Prio);
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begin
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null;
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end Set_Ceiling;
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-----------
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-- Sleep --
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-----------
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procedure Sleep
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(Self_ID : Task_Id;
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Reason : System.Tasking.Task_States)
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is
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pragma Unreferenced (Reason);
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Result : Interfaces.C.int;
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begin
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Result :=
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pthread_cond_wait
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(cond => Self_ID.Common.LL.CV'Access,
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mutex => (if Single_Lock
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then Single_RTS_Lock'Access
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else Self_ID.Common.LL.L'Access));
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-- EINTR is not considered a failure
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pragma Assert (Result = 0 or else Result = EINTR);
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if Self_ID.Deferral_Level = 0
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and then Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level
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then
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Unlock (Self_ID);
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raise Standard'Abort_Signal;
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end if;
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end Sleep;
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-----------------
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-- Timed_Sleep --
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-----------------
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procedure Timed_Sleep
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(Self_ID : Task_Id;
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Time : Duration;
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Mode : ST.Delay_Modes;
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Reason : System.Tasking.Task_States;
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Timedout : out Boolean;
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Yielded : out Boolean)
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is
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pragma Unreferenced (Reason);
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Sleep_Time : OS_Time;
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Result : Interfaces.C.int;
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Status : Cond_Value_Type;
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-- The body below requires more comments ???
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begin
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Timedout := False;
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Yielded := False;
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Sleep_Time := To_OS_Time (Time, Mode);
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if Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level then
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return;
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end if;
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Self_ID.Common.LL.AST_Pending := True;
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Sys_Setimr
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(Status, 0, Sleep_Time,
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Timer_Sleep_AST'Access, To_Address (Self_ID), 0);
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if (Status and 1) /= 1 then
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raise Storage_Error;
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end if;
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if Single_Lock then
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Result :=
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pthread_cond_wait
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(Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access);
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pragma Assert (Result = 0);
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else
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Result :=
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pthread_cond_wait
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(Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access);
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pragma Assert (Result = 0);
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end if;
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Yielded := True;
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if not Self_ID.Common.LL.AST_Pending then
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Timedout := True;
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else
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Sys_Cantim (Status, To_Address (Self_ID), 0);
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pragma Assert ((Status and 1) = 1);
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end if;
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end Timed_Sleep;
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-----------------
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-- Timed_Delay --
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-----------------
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procedure Timed_Delay
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(Self_ID : Task_Id;
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Time : Duration;
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Mode : ST.Delay_Modes)
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is
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Sleep_Time : OS_Time;
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Result : Interfaces.C.int;
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Status : Cond_Value_Type;
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Yielded : Boolean := False;
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begin
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if Single_Lock then
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Lock_RTS;
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end if;
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-- More comments required in body below ???
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Write_Lock (Self_ID);
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if Time /= 0.0 or else Mode /= Relative then
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Sleep_Time := To_OS_Time (Time, Mode);
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if Mode = Relative or else OS_Clock <= Sleep_Time then
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Self_ID.Common.State := Delay_Sleep;
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Self_ID.Common.LL.AST_Pending := True;
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Sys_Setimr
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(Status, 0, Sleep_Time,
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Timer_Sleep_AST'Access, To_Address (Self_ID), 0);
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-- Comment following test
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if (Status and 1) /= 1 then
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raise Storage_Error;
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end if;
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|
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loop
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if Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level then
|
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Sys_Cantim (Status, To_Address (Self_ID), 0);
|
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pragma Assert ((Status and 1) = 1);
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exit;
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end if;
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Result :=
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pthread_cond_wait
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(cond => Self_ID.Common.LL.CV'Access,
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mutex => (if Single_Lock
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then Single_RTS_Lock'Access
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else Self_ID.Common.LL.L'Access));
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pragma Assert (Result = 0);
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Yielded := True;
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exit when not Self_ID.Common.LL.AST_Pending;
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end loop;
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Self_ID.Common.State := Runnable;
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end if;
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end if;
|
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|
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Unlock (Self_ID);
|
|
|
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if Single_Lock then
|
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Unlock_RTS;
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end if;
|
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|
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if not Yielded then
|
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Result := sched_yield;
|
|
pragma Assert (Result = 0);
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|
end if;
|
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end Timed_Delay;
|
|
|
|
---------------------
|
|
-- Monotonic_Clock --
|
|
---------------------
|
|
|
|
function Monotonic_Clock return Duration
|
|
renames System.OS_Primitives.Monotonic_Clock;
|
|
|
|
-------------------
|
|
-- RT_Resolution --
|
|
-------------------
|
|
|
|
function RT_Resolution return Duration is
|
|
begin
|
|
-- Document origin of this magic constant ???
|
|
return 10#1.0#E-3;
|
|
end RT_Resolution;
|
|
|
|
------------
|
|
-- Wakeup --
|
|
------------
|
|
|
|
procedure Wakeup (T : Task_Id; Reason : System.Tasking.Task_States) is
|
|
pragma Unreferenced (Reason);
|
|
Result : Interfaces.C.int;
|
|
begin
|
|
Result := pthread_cond_signal (T.Common.LL.CV'Access);
|
|
pragma Assert (Result = 0);
|
|
end Wakeup;
|
|
|
|
-----------
|
|
-- Yield --
|
|
-----------
|
|
|
|
procedure Yield (Do_Yield : Boolean := True) is
|
|
Result : Interfaces.C.int;
|
|
pragma Unreferenced (Result);
|
|
begin
|
|
if Do_Yield then
|
|
Result := sched_yield;
|
|
end if;
|
|
end Yield;
|
|
|
|
------------------
|
|
-- Set_Priority --
|
|
------------------
|
|
|
|
procedure Set_Priority
|
|
(T : Task_Id;
|
|
Prio : System.Any_Priority;
|
|
Loss_Of_Inheritance : Boolean := False)
|
|
is
|
|
pragma Unreferenced (Loss_Of_Inheritance);
|
|
|
|
Result : Interfaces.C.int;
|
|
Param : aliased struct_sched_param;
|
|
|
|
function Get_Policy (Prio : System.Any_Priority) return Character;
|
|
pragma Import (C, Get_Policy, "__gnat_get_specific_dispatching");
|
|
-- Get priority specific dispatching policy
|
|
|
|
Priority_Specific_Policy : constant Character := Get_Policy (Prio);
|
|
-- Upper case first character of the policy name corresponding to the
|
|
-- task as set by a Priority_Specific_Dispatching pragma.
|
|
|
|
begin
|
|
T.Common.Current_Priority := Prio;
|
|
Param.sched_priority := Interfaces.C.int (Underlying_Priorities (Prio));
|
|
|
|
if Dispatching_Policy = 'R'
|
|
or else Priority_Specific_Policy = 'R'
|
|
or else Time_Slice_Val > 0
|
|
then
|
|
Result :=
|
|
pthread_setschedparam
|
|
(T.Common.LL.Thread, SCHED_RR, Param'Access);
|
|
|
|
elsif Dispatching_Policy = 'F'
|
|
or else Priority_Specific_Policy = 'F'
|
|
or else Time_Slice_Val = 0
|
|
then
|
|
Result :=
|
|
pthread_setschedparam
|
|
(T.Common.LL.Thread, SCHED_FIFO, Param'Access);
|
|
|
|
else
|
|
-- SCHED_OTHER priorities are restricted to the range 8 - 15.
|
|
-- Since the translation from Underlying priorities results
|
|
-- in a range of 16 - 31, dividing by 2 gives the correct result.
|
|
|
|
Param.sched_priority := Param.sched_priority / 2;
|
|
Result :=
|
|
pthread_setschedparam
|
|
(T.Common.LL.Thread, SCHED_OTHER, Param'Access);
|
|
end if;
|
|
|
|
pragma Assert (Result = 0);
|
|
end Set_Priority;
|
|
|
|
------------------
|
|
-- Get_Priority --
|
|
------------------
|
|
|
|
function Get_Priority (T : Task_Id) return System.Any_Priority is
|
|
begin
|
|
return T.Common.Current_Priority;
|
|
end Get_Priority;
|
|
|
|
----------------
|
|
-- Enter_Task --
|
|
----------------
|
|
|
|
procedure Enter_Task (Self_ID : Task_Id) is
|
|
begin
|
|
Self_ID.Common.LL.Thread := pthread_self;
|
|
Specific.Set (Self_ID);
|
|
end Enter_Task;
|
|
|
|
--------------
|
|
-- New_ATCB --
|
|
--------------
|
|
|
|
function New_ATCB (Entry_Num : Task_Entry_Index) return Task_Id is
|
|
begin
|
|
return new Ada_Task_Control_Block (Entry_Num);
|
|
end New_ATCB;
|
|
|
|
-------------------
|
|
-- Is_Valid_Task --
|
|
-------------------
|
|
|
|
function Is_Valid_Task return Boolean renames Specific.Is_Valid_Task;
|
|
|
|
-----------------------------
|
|
-- Register_Foreign_Thread --
|
|
-----------------------------
|
|
|
|
function Register_Foreign_Thread return Task_Id is
|
|
begin
|
|
if Is_Valid_Task then
|
|
return Self;
|
|
else
|
|
return Register_Foreign_Thread (pthread_self);
|
|
end if;
|
|
end Register_Foreign_Thread;
|
|
|
|
--------------------
|
|
-- Initialize_TCB --
|
|
--------------------
|
|
|
|
procedure Initialize_TCB (Self_ID : Task_Id; Succeeded : out Boolean) is
|
|
Mutex_Attr : aliased pthread_mutexattr_t;
|
|
Result : Interfaces.C.int;
|
|
Cond_Attr : aliased pthread_condattr_t;
|
|
|
|
begin
|
|
-- More comments required in body below ???
|
|
|
|
if not Single_Lock then
|
|
Result := pthread_mutexattr_init (Mutex_Attr'Access);
|
|
pragma Assert (Result = 0 or else Result = ENOMEM);
|
|
|
|
if Result = 0 then
|
|
Result :=
|
|
pthread_mutex_init
|
|
(Self_ID.Common.LL.L'Access, Mutex_Attr'Access);
|
|
pragma Assert (Result = 0 or else Result = ENOMEM);
|
|
end if;
|
|
|
|
if Result /= 0 then
|
|
Succeeded := False;
|
|
return;
|
|
end if;
|
|
|
|
Result := pthread_mutexattr_destroy (Mutex_Attr'Access);
|
|
pragma Assert (Result = 0);
|
|
end if;
|
|
|
|
Result := pthread_condattr_init (Cond_Attr'Access);
|
|
pragma Assert (Result = 0 or else Result = ENOMEM);
|
|
|
|
if Result = 0 then
|
|
Result :=
|
|
pthread_cond_init
|
|
(Self_ID.Common.LL.CV'Access, Cond_Attr'Access);
|
|
pragma Assert (Result = 0 or else Result = ENOMEM);
|
|
end if;
|
|
|
|
if Result = 0 then
|
|
Succeeded := True;
|
|
Self_ID.Common.LL.Exc_Stack_Ptr := new Exc_Stack_T;
|
|
|
|
else
|
|
if not Single_Lock then
|
|
Result := pthread_mutex_destroy (Self_ID.Common.LL.L'Access);
|
|
pragma Assert (Result = 0);
|
|
end if;
|
|
|
|
Succeeded := False;
|
|
end if;
|
|
|
|
Result := pthread_condattr_destroy (Cond_Attr'Access);
|
|
pragma Assert (Result = 0);
|
|
end Initialize_TCB;
|
|
|
|
------------------------
|
|
-- Get_Exc_Stack_Addr --
|
|
------------------------
|
|
|
|
function Get_Exc_Stack_Addr return Address is
|
|
begin
|
|
return Self.Common.LL.Exc_Stack_Ptr (Exc_Stack_T'Last)'Address;
|
|
end Get_Exc_Stack_Addr;
|
|
|
|
-----------------
|
|
-- Create_Task --
|
|
-----------------
|
|
|
|
procedure Create_Task
|
|
(T : Task_Id;
|
|
Wrapper : System.Address;
|
|
Stack_Size : System.Parameters.Size_Type;
|
|
Priority : System.Any_Priority;
|
|
Succeeded : out Boolean)
|
|
is
|
|
Attributes : aliased pthread_attr_t;
|
|
Result : Interfaces.C.int;
|
|
|
|
function Thread_Body_Access is new
|
|
Ada.Unchecked_Conversion (System.Aux_DEC.Short_Address, Thread_Body);
|
|
|
|
begin
|
|
-- Since the initial signal mask of a thread is inherited from the
|
|
-- creator, we need to set our local signal mask to mask all signals
|
|
-- during the creation operation, to make sure the new thread is
|
|
-- not disturbed by signals before it has set its own Task_Id.
|
|
|
|
Result := pthread_attr_init (Attributes'Access);
|
|
pragma Assert (Result = 0 or else Result = ENOMEM);
|
|
|
|
if Result /= 0 then
|
|
Succeeded := False;
|
|
return;
|
|
end if;
|
|
|
|
Result := pthread_attr_setdetachstate
|
|
(Attributes'Access, PTHREAD_CREATE_DETACHED);
|
|
pragma Assert (Result = 0);
|
|
|
|
Result := pthread_attr_setstacksize
|
|
(Attributes'Access, Interfaces.C.size_t (Stack_Size));
|
|
pragma Assert (Result = 0);
|
|
|
|
-- This call may be unnecessary, not sure. ???
|
|
|
|
Result :=
|
|
pthread_attr_setinheritsched
|
|
(Attributes'Access, PTHREAD_EXPLICIT_SCHED);
|
|
pragma Assert (Result = 0);
|
|
|
|
Result :=
|
|
pthread_create
|
|
(T.Common.LL.Thread'Access,
|
|
Attributes'Access,
|
|
Thread_Body_Access (Wrapper),
|
|
To_Address (T));
|
|
|
|
-- ENOMEM is a valid run-time error -- do not shut down
|
|
|
|
pragma Assert (Result = 0
|
|
or else Result = EAGAIN or else Result = ENOMEM);
|
|
|
|
Succeeded := Result = 0;
|
|
|
|
Result := pthread_attr_destroy (Attributes'Access);
|
|
pragma Assert (Result = 0);
|
|
|
|
if Succeeded then
|
|
Set_Priority (T, Priority);
|
|
end if;
|
|
end Create_Task;
|
|
|
|
------------------
|
|
-- Finalize_TCB --
|
|
------------------
|
|
|
|
procedure Finalize_TCB (T : Task_Id) is
|
|
Result : Interfaces.C.int;
|
|
Tmp : Task_Id := T;
|
|
Is_Self : constant Boolean := T = Self;
|
|
|
|
procedure Free is new
|
|
Ada.Unchecked_Deallocation (Ada_Task_Control_Block, Task_Id);
|
|
|
|
procedure Free is new Ada.Unchecked_Deallocation
|
|
(Exc_Stack_T, Exc_Stack_Ptr_T);
|
|
|
|
begin
|
|
if not Single_Lock then
|
|
Result := pthread_mutex_destroy (T.Common.LL.L'Access);
|
|
pragma Assert (Result = 0);
|
|
end if;
|
|
|
|
Result := pthread_cond_destroy (T.Common.LL.CV'Access);
|
|
pragma Assert (Result = 0);
|
|
|
|
if T.Known_Tasks_Index /= -1 then
|
|
Known_Tasks (T.Known_Tasks_Index) := null;
|
|
end if;
|
|
|
|
Free (T.Common.LL.Exc_Stack_Ptr);
|
|
Free (Tmp);
|
|
|
|
if Is_Self then
|
|
Specific.Set (null);
|
|
end if;
|
|
end Finalize_TCB;
|
|
|
|
---------------
|
|
-- Exit_Task --
|
|
---------------
|
|
|
|
procedure Exit_Task is
|
|
begin
|
|
null;
|
|
end Exit_Task;
|
|
|
|
----------------
|
|
-- Abort_Task --
|
|
----------------
|
|
|
|
procedure Abort_Task (T : Task_Id) is
|
|
begin
|
|
-- Interrupt Server_Tasks may be waiting on an event flag
|
|
|
|
if T.Common.State = Interrupt_Server_Blocked_On_Event_Flag then
|
|
Wakeup (T, Interrupt_Server_Blocked_On_Event_Flag);
|
|
end if;
|
|
end Abort_Task;
|
|
|
|
----------------
|
|
-- Initialize --
|
|
----------------
|
|
|
|
procedure Initialize (S : in out Suspension_Object) is
|
|
Mutex_Attr : aliased pthread_mutexattr_t;
|
|
Cond_Attr : aliased pthread_condattr_t;
|
|
Result : Interfaces.C.int;
|
|
begin
|
|
-- Initialize internal state (always to False (D.10 (6)))
|
|
|
|
S.State := False;
|
|
S.Waiting := False;
|
|
|
|
-- Initialize internal mutex
|
|
|
|
Result := pthread_mutexattr_init (Mutex_Attr'Access);
|
|
pragma Assert (Result = 0 or else Result = ENOMEM);
|
|
|
|
if Result = ENOMEM then
|
|
raise Storage_Error;
|
|
end if;
|
|
|
|
Result := pthread_mutex_init (S.L'Access, Mutex_Attr'Access);
|
|
pragma Assert (Result = 0 or else Result = ENOMEM);
|
|
|
|
if Result = ENOMEM then
|
|
Result := pthread_mutexattr_destroy (Mutex_Attr'Access);
|
|
pragma Assert (Result = 0);
|
|
|
|
raise Storage_Error;
|
|
end if;
|
|
|
|
Result := pthread_mutexattr_destroy (Mutex_Attr'Access);
|
|
pragma Assert (Result = 0);
|
|
|
|
-- Initialize internal condition variable
|
|
|
|
Result := pthread_condattr_init (Cond_Attr'Access);
|
|
pragma Assert (Result = 0 or else Result = ENOMEM);
|
|
|
|
if Result /= 0 then
|
|
Result := pthread_mutex_destroy (S.L'Access);
|
|
pragma Assert (Result = 0);
|
|
|
|
if Result = ENOMEM then
|
|
raise Storage_Error;
|
|
end if;
|
|
end if;
|
|
|
|
Result := pthread_cond_init (S.CV'Access, Cond_Attr'Access);
|
|
pragma Assert (Result = 0 or else Result = ENOMEM);
|
|
|
|
if Result /= 0 then
|
|
Result := pthread_mutex_destroy (S.L'Access);
|
|
pragma Assert (Result = 0);
|
|
|
|
if Result = ENOMEM then
|
|
Result := pthread_condattr_destroy (Cond_Attr'Access);
|
|
pragma Assert (Result = 0);
|
|
|
|
raise Storage_Error;
|
|
end if;
|
|
end if;
|
|
|
|
Result := pthread_condattr_destroy (Cond_Attr'Access);
|
|
pragma Assert (Result = 0);
|
|
end Initialize;
|
|
|
|
--------------
|
|
-- Finalize --
|
|
--------------
|
|
|
|
procedure Finalize (S : in out Suspension_Object) is
|
|
Result : Interfaces.C.int;
|
|
|
|
begin
|
|
-- Destroy internal mutex
|
|
|
|
Result := pthread_mutex_destroy (S.L'Access);
|
|
pragma Assert (Result = 0);
|
|
|
|
-- Destroy internal condition variable
|
|
|
|
Result := pthread_cond_destroy (S.CV'Access);
|
|
pragma Assert (Result = 0);
|
|
end Finalize;
|
|
|
|
-------------------
|
|
-- Current_State --
|
|
-------------------
|
|
|
|
function Current_State (S : Suspension_Object) return Boolean is
|
|
begin
|
|
-- We do not want to use lock on this read operation. State is marked
|
|
-- as Atomic so that we ensure that the value retrieved is correct.
|
|
|
|
return S.State;
|
|
end Current_State;
|
|
|
|
---------------
|
|
-- Set_False --
|
|
---------------
|
|
|
|
procedure Set_False (S : in out Suspension_Object) is
|
|
Result : Interfaces.C.int;
|
|
|
|
begin
|
|
SSL.Abort_Defer.all;
|
|
|
|
Result := pthread_mutex_lock (S.L'Access);
|
|
pragma Assert (Result = 0);
|
|
|
|
S.State := False;
|
|
|
|
Result := pthread_mutex_unlock (S.L'Access);
|
|
pragma Assert (Result = 0);
|
|
|
|
SSL.Abort_Undefer.all;
|
|
end Set_False;
|
|
|
|
--------------
|
|
-- Set_True --
|
|
--------------
|
|
|
|
procedure Set_True (S : in out Suspension_Object) is
|
|
Result : Interfaces.C.int;
|
|
|
|
begin
|
|
SSL.Abort_Defer.all;
|
|
|
|
Result := pthread_mutex_lock (S.L'Access);
|
|
pragma Assert (Result = 0);
|
|
|
|
-- If there is already a task waiting on this suspension object then
|
|
-- we resume it, leaving the state of the suspension object to False,
|
|
-- as specified in (RM D.10(9)), otherwise leave state set to True.
|
|
|
|
if S.Waiting then
|
|
S.Waiting := False;
|
|
S.State := False;
|
|
|
|
Result := pthread_cond_signal (S.CV'Access);
|
|
pragma Assert (Result = 0);
|
|
|
|
else
|
|
S.State := True;
|
|
end if;
|
|
|
|
Result := pthread_mutex_unlock (S.L'Access);
|
|
pragma Assert (Result = 0);
|
|
|
|
SSL.Abort_Undefer.all;
|
|
end Set_True;
|
|
|
|
------------------------
|
|
-- Suspend_Until_True --
|
|
------------------------
|
|
|
|
procedure Suspend_Until_True (S : in out Suspension_Object) is
|
|
Result : Interfaces.C.int;
|
|
|
|
begin
|
|
SSL.Abort_Defer.all;
|
|
|
|
Result := pthread_mutex_lock (S.L'Access);
|
|
pragma Assert (Result = 0);
|
|
|
|
if S.Waiting then
|
|
|
|
-- Program_Error must be raised upon calling Suspend_Until_True
|
|
-- if another task is already waiting on that suspension object
|
|
-- (RM D.10(10)).
|
|
|
|
Result := pthread_mutex_unlock (S.L'Access);
|
|
pragma Assert (Result = 0);
|
|
|
|
SSL.Abort_Undefer.all;
|
|
|
|
raise Program_Error;
|
|
|
|
else
|
|
-- Suspend the task if the state is False. Otherwise, the task
|
|
-- continues its execution, and the state of the suspension object
|
|
-- is set to False (ARM D.10 par. 9).
|
|
|
|
if S.State then
|
|
S.State := False;
|
|
else
|
|
S.Waiting := True;
|
|
|
|
loop
|
|
-- Loop in case pthread_cond_wait returns earlier than expected
|
|
-- (e.g. in case of EINTR caused by a signal).
|
|
|
|
Result := pthread_cond_wait (S.CV'Access, S.L'Access);
|
|
pragma Assert (Result = 0 or else Result = EINTR);
|
|
|
|
exit when not S.Waiting;
|
|
end loop;
|
|
end if;
|
|
|
|
Result := pthread_mutex_unlock (S.L'Access);
|
|
pragma Assert (Result = 0);
|
|
|
|
SSL.Abort_Undefer.all;
|
|
end if;
|
|
end Suspend_Until_True;
|
|
|
|
----------------
|
|
-- Check_Exit --
|
|
----------------
|
|
|
|
-- Dummy version
|
|
|
|
function Check_Exit (Self_ID : ST.Task_Id) return Boolean is
|
|
pragma Unreferenced (Self_ID);
|
|
begin
|
|
return True;
|
|
end Check_Exit;
|
|
|
|
--------------------
|
|
-- Check_No_Locks --
|
|
--------------------
|
|
|
|
function Check_No_Locks (Self_ID : ST.Task_Id) return Boolean is
|
|
pragma Unreferenced (Self_ID);
|
|
begin
|
|
return True;
|
|
end Check_No_Locks;
|
|
|
|
----------------------
|
|
-- Environment_Task --
|
|
----------------------
|
|
|
|
function Environment_Task return Task_Id is
|
|
begin
|
|
return Environment_Task_Id;
|
|
end Environment_Task;
|
|
|
|
--------------
|
|
-- Lock_RTS --
|
|
--------------
|
|
|
|
procedure Lock_RTS is
|
|
begin
|
|
Write_Lock (Single_RTS_Lock'Access, Global_Lock => True);
|
|
end Lock_RTS;
|
|
|
|
----------------
|
|
-- Unlock_RTS --
|
|
----------------
|
|
|
|
procedure Unlock_RTS is
|
|
begin
|
|
Unlock (Single_RTS_Lock'Access, Global_Lock => True);
|
|
end Unlock_RTS;
|
|
|
|
------------------
|
|
-- Suspend_Task --
|
|
------------------
|
|
|
|
function Suspend_Task
|
|
(T : ST.Task_Id;
|
|
Thread_Self : Thread_Id) return Boolean
|
|
is
|
|
pragma Unreferenced (T);
|
|
pragma Unreferenced (Thread_Self);
|
|
begin
|
|
return False;
|
|
end Suspend_Task;
|
|
|
|
-----------------
|
|
-- Resume_Task --
|
|
-----------------
|
|
|
|
function Resume_Task
|
|
(T : ST.Task_Id;
|
|
Thread_Self : Thread_Id) return Boolean
|
|
is
|
|
pragma Unreferenced (T);
|
|
pragma Unreferenced (Thread_Self);
|
|
begin
|
|
return False;
|
|
end Resume_Task;
|
|
|
|
--------------------
|
|
-- Stop_All_Tasks --
|
|
--------------------
|
|
|
|
procedure Stop_All_Tasks is
|
|
begin
|
|
null;
|
|
end Stop_All_Tasks;
|
|
|
|
---------------
|
|
-- Stop_Task --
|
|
---------------
|
|
|
|
function Stop_Task (T : ST.Task_Id) return Boolean is
|
|
pragma Unreferenced (T);
|
|
begin
|
|
return False;
|
|
end Stop_Task;
|
|
|
|
-------------------
|
|
-- Continue_Task --
|
|
-------------------
|
|
|
|
function Continue_Task (T : ST.Task_Id) return Boolean is
|
|
pragma Unreferenced (T);
|
|
begin
|
|
return False;
|
|
end Continue_Task;
|
|
|
|
----------------
|
|
-- Initialize --
|
|
----------------
|
|
|
|
procedure Initialize (Environment_Task : Task_Id) is
|
|
|
|
-- The DEC Ada facility code defined in Starlet
|
|
Ada_Facility : constant := 49;
|
|
|
|
function DBGEXT (Control_Block : System.Address)
|
|
return System.Aux_DEC.Unsigned_Word;
|
|
-- DBGEXT is imported from s-tasdeb.adb and its parameter re-typed
|
|
-- as Address to avoid having a VMS specific s-tasdeb.ads.
|
|
pragma Interface (C, DBGEXT);
|
|
pragma Import_Function (DBGEXT, "GNAT$DBGEXT");
|
|
|
|
type Facility_Type is range 0 .. 65535;
|
|
|
|
procedure Debug_Register
|
|
(ADBGEXT : System.Address;
|
|
ATCB_Key : pthread_key_t;
|
|
Facility : Facility_Type;
|
|
Std_Prolog : Integer);
|
|
pragma Import (C, Debug_Register, "CMA$DEBUG_REGISTER");
|
|
begin
|
|
Environment_Task_Id := Environment_Task;
|
|
|
|
SSL.Get_Exc_Stack_Addr := Get_Exc_Stack_Addr'Access;
|
|
|
|
-- Initialize the lock used to synchronize chain of all ATCBs
|
|
|
|
Initialize_Lock (Single_RTS_Lock'Access, RTS_Lock_Level);
|
|
|
|
Specific.Initialize (Environment_Task);
|
|
|
|
-- Pass the context key on to CMA along with the other parameters
|
|
Debug_Register
|
|
(
|
|
DBGEXT'Address, -- Our DEBUG handling entry point
|
|
ATCB_Key, -- CMA context key for our Ada TCB's
|
|
Ada_Facility, -- Out facility code
|
|
0 -- False, we don't have the std TCB prolog
|
|
);
|
|
|
|
-- Make environment task known here because it doesn't go through
|
|
-- Activate_Tasks, which does it for all other tasks.
|
|
|
|
Known_Tasks (Known_Tasks'First) := Environment_Task;
|
|
Environment_Task.Known_Tasks_Index := Known_Tasks'First;
|
|
|
|
Enter_Task (Environment_Task);
|
|
end Initialize;
|
|
|
|
end System.Task_Primitives.Operations;
|