1037 lines
30 KiB
Ada
1037 lines
30 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNU ADA 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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-- --
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-- Copyright (C) 1992-2001, 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 2, or (at your option) any later ver- --
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-- sion. GNARL 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. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNARL; see file COPYING. If not, write --
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-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
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-- MA 02111-1307, USA. --
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-- --
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-- As a special exception, if other files instantiate generics from this --
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-- unit, or you link this unit with other files to produce an executable, --
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-- this unit does not by itself cause the resulting executable to be --
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-- covered by the GNU General Public License. This exception does not --
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-- however invalidate any other reasons why the executable file might be --
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-- covered by the GNU Public License. --
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-- --
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-- GNARL was developed by the GNARL team at Florida State University. It is --
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-- now maintained by Ada Core Technologies, Inc. (http://www.gnat.com). --
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-- --
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------------------------------------------------------------------------------
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-- This is a DEC Unix 4.0d version of this package
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-- This package contains all the GNULL primitives that interface directly
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-- with 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
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-- tasking operations. It causes infinite loops and other problems.
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with System.Tasking.Debug;
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-- used for Known_Tasks
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with System.Task_Info;
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-- used for Task_Info_Type
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with Interfaces;
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-- used for Shift_Left
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with Interfaces.C;
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-- used for int
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-- size_t
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with System.Interrupt_Management;
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-- used for Keep_Unmasked
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-- Abort_Task_Interrupt
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-- Interrupt_ID
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with System.Interrupt_Management.Operations;
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-- used for Set_Interrupt_Mask
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-- All_Tasks_Mask
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pragma Elaborate_All (System.Interrupt_Management.Operations);
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with System.Parameters;
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-- used for Size_Type
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with System.Tasking;
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-- used for Ada_Task_Control_Block
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-- Task_ID
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-- ATCB components and types
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with System.Soft_Links;
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-- used for Defer/Undefer_Abort
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-- Note that we do not use System.Tasking.Initialization directly since
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-- this is a higher level package that we shouldn't depend on. For example
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-- when using the restricted run time, it is replaced by
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-- System.Tasking.Restricted.Initialization
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with System.OS_Primitives;
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-- used for Delay_Modes
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with Unchecked_Conversion;
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with Unchecked_Deallocation;
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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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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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Environment_Task_ID : Task_ID;
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-- A variable to hold Task_ID for the environment task.
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Unblocked_Signal_Mask : aliased sigset_t;
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-- The set of signals that should unblocked in all tasks
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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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Locking_Policy : Character;
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pragma Import (C, Locking_Policy, "__gl_locking_policy");
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Dispatching_Policy : Character;
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pragma Import (C, Dispatching_Policy, "__gl_task_dispatching_policy");
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FIFO_Within_Priorities : constant Boolean := Dispatching_Policy = 'F';
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-- Indicates whether FIFO_Within_Priorities is set.
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Curpid : pid_t;
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-----------------------
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-- Local Subprograms --
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-----------------------
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procedure Abort_Handler (Sig : Signal);
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function To_Task_ID is new Unchecked_Conversion (System.Address, Task_ID);
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function To_Address is new Unchecked_Conversion (Task_ID, System.Address);
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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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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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-- Abort_Handler --
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-------------------
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procedure Abort_Handler (Sig : Signal) is
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T : constant Task_ID := Self;
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Result : Interfaces.C.int;
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Old_Set : aliased sigset_t;
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begin
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if T.Deferral_Level = 0
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and then T.Pending_ATC_Level < T.ATC_Nesting_Level and then
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not T.Aborting
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then
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T.Aborting := True;
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-- Make sure signals used for RTS internal purpose are unmasked
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Result := pthread_sigmask (SIG_UNBLOCK,
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Unblocked_Signal_Mask'Unchecked_Access, Old_Set'Unchecked_Access);
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pragma Assert (Result = 0);
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raise Standard'Abort_Signal;
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end if;
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end Abort_Handler;
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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
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-- bottom of a thread stack, so nothing is needed.
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procedure Stack_Guard (T : ST.Task_ID; On : Boolean) is
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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
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-- initialized in Initialize_TCB and the Storage_Error is
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-- handled. Other mutexes (such as RTS_Lock, Memory_Lock...)
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-- used in RTS is initialized before any status change of RTS.
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-- Therefore rasing Storage_Error in the following routines
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-- 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 : 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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if Locking_Policy = 'C' then
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L.Ceiling := Interfaces.C.int (Prio);
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end if;
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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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Result := pthread_mutexattr_destroy (Attributes'Access);
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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 (L : access RTS_Lock; Level : Lock_Level) 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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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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Result := pthread_mutexattr_destroy (Attributes'Access);
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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 : 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 : 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 (L : access Lock; Ceiling_Violation : out Boolean) is
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Result : Interfaces.C.int;
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Self_ID : Task_ID;
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All_Tasks_Link : Task_ID;
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Current_Prio : System.Any_Priority;
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begin
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-- Perform ceiling checks only when this is the locking policy in use.
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if Locking_Policy = 'C' then
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Self_ID := Self;
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All_Tasks_Link := Self_ID.Common.All_Tasks_Link;
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Current_Prio := Get_Priority (Self_ID);
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-- If there is no other task, no need to check priorities
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if All_Tasks_Link /= Null_Task
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and then L.Ceiling < 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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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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end Write_Lock;
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procedure Write_Lock
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(L : access RTS_Lock; 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 (L : access Lock; Ceiling_Violation : out Boolean) 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 : 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 (L : access RTS_Lock; Global_Lock : Boolean := False) 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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-- 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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Result : Interfaces.C.int;
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begin
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if Single_Lock then
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Result := pthread_cond_wait
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(Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access);
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else
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Result := pthread_cond_wait
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(Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access);
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end if;
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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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end Sleep;
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-----------------
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-- Timed_Sleep --
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-----------------
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-- This is for use within the run-time system, so abort is
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-- assumed to be already deferred, and the caller should be
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-- holding its own ATCB lock.
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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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Check_Time : constant Duration := Monotonic_Clock;
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Abs_Time : Duration;
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Request : aliased timespec;
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Result : Interfaces.C.int;
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begin
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Timedout := True;
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Yielded := False;
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if Mode = Relative then
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Abs_Time := Duration'Min (Time, Max_Sensible_Delay) + Check_Time;
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else
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Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time);
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end if;
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if Abs_Time > Check_Time then
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Request := To_Timespec (Abs_Time);
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loop
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exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level
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or else Self_ID.Pending_Priority_Change;
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if Single_Lock then
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Result := pthread_cond_timedwait
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(Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access,
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Request'Access);
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else
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Result := pthread_cond_timedwait
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(Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access,
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Request'Access);
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end if;
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exit when Abs_Time <= Monotonic_Clock;
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if Result = 0 or Result = EINTR then
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-- somebody may have called Wakeup for us
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Timedout := False;
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exit;
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end if;
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pragma Assert (Result = ETIMEDOUT);
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end loop;
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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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|
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-- This is for use in implementing delay statements, so
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-- we assume the caller is abort-deferred but is holding
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-- no locks.
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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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Check_Time : constant Duration := Monotonic_Clock;
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Abs_Time : Duration;
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Request : aliased timespec;
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Result : Interfaces.C.int;
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begin
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-- Only the little window between deferring abort and
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-- locking Self_ID is the reason we need to
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-- check for pending abort and priority change below! :(
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SSL.Abort_Defer.all;
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if Single_Lock then
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Lock_RTS;
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end if;
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Write_Lock (Self_ID);
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if Mode = Relative then
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Abs_Time := Time + Check_Time;
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else
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Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time);
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end if;
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if Abs_Time > Check_Time then
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Request := To_Timespec (Abs_Time);
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Self_ID.Common.State := Delay_Sleep;
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loop
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if Self_ID.Pending_Priority_Change then
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Self_ID.Pending_Priority_Change := False;
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Self_ID.Common.Base_Priority := Self_ID.New_Base_Priority;
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Set_Priority (Self_ID, Self_ID.Common.Base_Priority);
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end if;
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exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level;
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if Single_Lock then
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Result := pthread_cond_timedwait (Self_ID.Common.LL.CV'Access,
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Single_RTS_Lock'Access, Request'Access);
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else
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Result := pthread_cond_timedwait (Self_ID.Common.LL.CV'Access,
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Self_ID.Common.LL.L'Access, Request'Access);
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end if;
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exit when Abs_Time <= Monotonic_Clock;
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pragma Assert (Result = 0 or else
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Result = ETIMEDOUT or else
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Result = EINTR);
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end loop;
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|
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Self_ID.Common.State := Runnable;
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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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Yield;
|
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SSL.Abort_Undefer.all;
|
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end Timed_Delay;
|
|
|
|
---------------------
|
|
-- Monotonic_Clock --
|
|
---------------------
|
|
|
|
function Monotonic_Clock return Duration is
|
|
TS : aliased timespec;
|
|
Result : Interfaces.C.int;
|
|
|
|
begin
|
|
Result := clock_gettime (CLOCK_REALTIME, TS'Unchecked_Access);
|
|
pragma Assert (Result = 0);
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|
return To_Duration (TS);
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|
end Monotonic_Clock;
|
|
|
|
-------------------
|
|
-- RT_Resolution --
|
|
-------------------
|
|
|
|
function RT_Resolution return Duration is
|
|
begin
|
|
return 1.0 / 1024.0; -- Clock on DEC Alpha ticks at 1024 Hz
|
|
end RT_Resolution;
|
|
|
|
------------
|
|
-- Wakeup --
|
|
------------
|
|
|
|
procedure Wakeup (T : Task_ID; Reason : System.Tasking.Task_States) is
|
|
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;
|
|
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
|
|
Result : Interfaces.C.int;
|
|
Param : aliased struct_sched_param;
|
|
|
|
begin
|
|
T.Common.Current_Priority := Prio;
|
|
Param.sched_priority := Interfaces.C.int (Underlying_Priorities (Prio));
|
|
|
|
if Time_Slice_Val > 0 then
|
|
Result := pthread_setschedparam
|
|
(T.Common.LL.Thread, SCHED_RR, Param'Access);
|
|
|
|
elsif FIFO_Within_Priorities or else Time_Slice_Val = 0 then
|
|
Result := pthread_setschedparam
|
|
(T.Common.LL.Thread, SCHED_FIFO, Param'Access);
|
|
|
|
else
|
|
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);
|
|
|
|
Lock_RTS;
|
|
|
|
for J in Known_Tasks'Range loop
|
|
if Known_Tasks (J) = null then
|
|
Known_Tasks (J) := Self_ID;
|
|
Self_ID.Known_Tasks_Index := J;
|
|
exit;
|
|
end if;
|
|
end loop;
|
|
|
|
Unlock_RTS;
|
|
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;
|
|
|
|
--------------------
|
|
-- 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
|
|
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;
|
|
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;
|
|
|
|
-----------------
|
|
-- 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;
|
|
Adjusted_Stack_Size : Interfaces.C.size_t;
|
|
Result : Interfaces.C.int;
|
|
Param : aliased System.OS_Interface.struct_sched_param;
|
|
|
|
function Thread_Body_Access is new
|
|
Unchecked_Conversion (System.Address, Thread_Body);
|
|
|
|
use System.Task_Info;
|
|
|
|
begin
|
|
if Stack_Size = Unspecified_Size then
|
|
Adjusted_Stack_Size := Interfaces.C.size_t (Default_Stack_Size);
|
|
|
|
elsif Stack_Size < Minimum_Stack_Size then
|
|
Adjusted_Stack_Size := Interfaces.C.size_t (Minimum_Stack_Size);
|
|
|
|
else
|
|
Adjusted_Stack_Size := Interfaces.C.size_t (Stack_Size);
|
|
end if;
|
|
|
|
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, Adjusted_Stack_Size);
|
|
pragma Assert (Result = 0);
|
|
|
|
-- Set the scheduling parameters explicitly, since this is the only
|
|
-- way to force the OS to take the scope attribute into account
|
|
|
|
Result := pthread_attr_setinheritsched
|
|
(Attributes'Access, PTHREAD_EXPLICIT_SCHED);
|
|
pragma Assert (Result = 0);
|
|
|
|
Param.sched_priority :=
|
|
Interfaces.C.int (Underlying_Priorities (Priority));
|
|
Result := pthread_attr_setschedparam
|
|
(Attributes'Access, Param'Access);
|
|
pragma Assert (Result = 0);
|
|
|
|
if Time_Slice_Val > 0 then
|
|
Result := pthread_attr_setschedpolicy
|
|
(Attributes'Access, System.OS_Interface.SCHED_RR);
|
|
|
|
elsif FIFO_Within_Priorities or else Time_Slice_Val = 0 then
|
|
Result := pthread_attr_setschedpolicy
|
|
(Attributes'Access, System.OS_Interface.SCHED_FIFO);
|
|
|
|
else
|
|
Result := pthread_attr_setschedpolicy
|
|
(Attributes'Access, System.OS_Interface.SCHED_OTHER);
|
|
end if;
|
|
|
|
pragma Assert (Result = 0);
|
|
|
|
T.Common.Current_Priority := Priority;
|
|
|
|
if T.Common.Task_Info /= null then
|
|
case T.Common.Task_Info.Contention_Scope is
|
|
when System.Task_Info.Process_Scope =>
|
|
Result := pthread_attr_setscope
|
|
(Attributes'Access, PTHREAD_SCOPE_PROCESS);
|
|
|
|
when System.Task_Info.System_Scope =>
|
|
Result := pthread_attr_setscope
|
|
(Attributes'Access, PTHREAD_SCOPE_SYSTEM);
|
|
|
|
when System.Task_Info.Default_Scope =>
|
|
Result := 0;
|
|
end case;
|
|
|
|
pragma Assert (Result = 0);
|
|
end if;
|
|
|
|
-- Since the initial signal mask of a thread is inherited from the
|
|
-- creator, and the Environment task has all its signals masked, we
|
|
-- do not need to manipulate caller's signal mask at this point.
|
|
-- All tasks in RTS will have All_Tasks_Mask initially.
|
|
|
|
Result := pthread_create
|
|
(T.Common.LL.Thread'Access,
|
|
Attributes'Access,
|
|
Thread_Body_Access (Wrapper),
|
|
To_Address (T));
|
|
pragma Assert (Result = 0 or else Result = EAGAIN);
|
|
|
|
Succeeded := Result = 0;
|
|
|
|
Result := pthread_attr_destroy (Attributes'Access);
|
|
pragma Assert (Result = 0);
|
|
|
|
if T.Common.Task_Info /= null then
|
|
if T.Common.Task_Info.Bind_To_Cpu_Number = 0 then
|
|
Result := bind_to_cpu (Curpid, 0);
|
|
elsif T.Common.Task_Info.Bind_To_Cpu_Number > 0 then
|
|
Result := bind_to_cpu
|
|
(Curpid,
|
|
Interfaces.C.unsigned_long (
|
|
Interfaces.Shift_Left
|
|
(Interfaces.Unsigned_64'(1),
|
|
T.Common.Task_Info.Bind_To_Cpu_Number - 1)));
|
|
pragma Assert (Result = 0);
|
|
end if;
|
|
end if;
|
|
end Create_Task;
|
|
|
|
------------------
|
|
-- Finalize_TCB --
|
|
------------------
|
|
|
|
procedure Finalize_TCB (T : Task_ID) is
|
|
Result : Interfaces.C.int;
|
|
Tmp : Task_ID := T;
|
|
|
|
procedure Free is new
|
|
Unchecked_Deallocation (Ada_Task_Control_Block, Task_ID);
|
|
|
|
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 (Tmp);
|
|
end Finalize_TCB;
|
|
|
|
---------------
|
|
-- Exit_Task --
|
|
---------------
|
|
|
|
procedure Exit_Task is
|
|
begin
|
|
pthread_exit (System.Null_Address);
|
|
end Exit_Task;
|
|
|
|
----------------
|
|
-- Abort_Task --
|
|
----------------
|
|
|
|
procedure Abort_Task (T : Task_ID) is
|
|
Result : Interfaces.C.int;
|
|
|
|
begin
|
|
Result := pthread_kill (T.Common.LL.Thread,
|
|
Signal (System.Interrupt_Management.Abort_Task_Interrupt));
|
|
pragma Assert (Result = 0);
|
|
end Abort_Task;
|
|
|
|
----------------
|
|
-- Check_Exit --
|
|
----------------
|
|
|
|
-- Dummy versions. The only currently working versions is for solaris
|
|
-- (native).
|
|
|
|
function Check_Exit (Self_ID : ST.Task_ID) return Boolean is
|
|
begin
|
|
return True;
|
|
end Check_Exit;
|
|
|
|
--------------------
|
|
-- Check_No_Locks --
|
|
--------------------
|
|
|
|
function Check_No_Locks (Self_ID : ST.Task_ID) return Boolean is
|
|
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
|
|
begin
|
|
return False;
|
|
end Suspend_Task;
|
|
|
|
-----------------
|
|
-- Resume_Task --
|
|
-----------------
|
|
|
|
function Resume_Task
|
|
(T : ST.Task_ID;
|
|
Thread_Self : Thread_Id) return Boolean is
|
|
begin
|
|
return False;
|
|
end Resume_Task;
|
|
|
|
----------------
|
|
-- Initialize --
|
|
----------------
|
|
|
|
procedure Initialize (Environment_Task : Task_ID) is
|
|
act : aliased struct_sigaction;
|
|
old_act : aliased struct_sigaction;
|
|
Tmp_Set : aliased sigset_t;
|
|
Result : Interfaces.C.int;
|
|
|
|
begin
|
|
Environment_Task_ID := Environment_Task;
|
|
|
|
Initialize_Lock (Single_RTS_Lock'Access, RTS_Lock_Level);
|
|
-- Initialize the lock used to synchronize chain of all ATCBs.
|
|
|
|
Specific.Initialize (Environment_Task);
|
|
|
|
Enter_Task (Environment_Task);
|
|
|
|
-- Install the abort-signal handler
|
|
|
|
act.sa_flags := 0;
|
|
act.sa_handler := Abort_Handler'Address;
|
|
|
|
Result := sigemptyset (Tmp_Set'Access);
|
|
pragma Assert (Result = 0);
|
|
act.sa_mask := Tmp_Set;
|
|
|
|
Result :=
|
|
sigaction
|
|
(Signal (System.Interrupt_Management.Abort_Task_Interrupt),
|
|
act'Unchecked_Access,
|
|
old_act'Unchecked_Access);
|
|
pragma Assert (Result = 0);
|
|
end Initialize;
|
|
|
|
begin
|
|
declare
|
|
Result : Interfaces.C.int;
|
|
begin
|
|
-- Mask Environment task for all signals. The original mask of the
|
|
-- Environment task will be recovered by Interrupt_Server task
|
|
-- during the elaboration of s-interr.adb.
|
|
|
|
System.Interrupt_Management.Operations.Set_Interrupt_Mask
|
|
(System.Interrupt_Management.Operations.All_Tasks_Mask'Access);
|
|
|
|
-- Prepare the set of signals that should unblocked in all tasks
|
|
|
|
Result := sigemptyset (Unblocked_Signal_Mask'Access);
|
|
pragma Assert (Result = 0);
|
|
|
|
for J in Interrupt_Management.Interrupt_ID loop
|
|
if System.Interrupt_Management.Keep_Unmasked (J) then
|
|
Result := sigaddset (Unblocked_Signal_Mask'Access, Signal (J));
|
|
pragma Assert (Result = 0);
|
|
end if;
|
|
end loop;
|
|
end;
|
|
|
|
Curpid := getpid;
|
|
end System.Task_Primitives.Operations;
|