1424 lines
39 KiB
Ada
1424 lines
39 KiB
Ada
|
------------------------------------------------------------------------------
|
||
|
-- --
|
||
|
-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
|
||
|
-- --
|
||
|
-- 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 --
|
||
|
-- --
|
||
|
-- B o d y --
|
||
|
-- --
|
||
|
-- Copyright (C) 1992-2009, Free Software Foundation, Inc. --
|
||
|
-- --
|
||
|
-- GNARL is free software; you can redistribute it and/or modify it under --
|
||
|
-- terms of the GNU General Public License as published by the Free Soft- --
|
||
|
-- ware Foundation; either version 3, or (at your option) any later ver- --
|
||
|
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
|
||
|
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
|
||
|
-- or FITNESS FOR A PARTICULAR PURPOSE. --
|
||
|
-- --
|
||
|
-- As a special exception under Section 7 of GPL version 3, you are granted --
|
||
|
-- additional permissions described in the GCC Runtime Library Exception, --
|
||
|
-- version 3.1, as published by the Free Software Foundation. --
|
||
|
-- --
|
||
|
-- You should have received a copy of the GNU General Public License and --
|
||
|
-- a copy of the GCC Runtime Library Exception along with this program; --
|
||
|
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
|
||
|
-- <http://www.gnu.org/licenses/>. --
|
||
|
-- --
|
||
|
-- GNARL was developed by the GNARL team at Florida State University. --
|
||
|
-- Extensive contributions were provided by Ada Core Technologies, Inc. --
|
||
|
-- --
|
||
|
------------------------------------------------------------------------------
|
||
|
|
||
|
-- This is a LynxOS version of this file, adapted to make SCHED_FIFO and
|
||
|
-- ceiling locking (Annex D compliance) work properly.
|
||
|
|
||
|
-- This package contains all the GNULL primitives that interface directly with
|
||
|
-- the underlying OS.
|
||
|
|
||
|
pragma Polling (Off);
|
||
|
-- Turn off polling, we do not want ATC polling to take place during tasking
|
||
|
-- operations. It causes infinite loops and other problems.
|
||
|
|
||
|
with Ada.Unchecked_Deallocation;
|
||
|
|
||
|
with Interfaces.C;
|
||
|
|
||
|
with System.Tasking.Debug;
|
||
|
with System.Interrupt_Management;
|
||
|
with System.OS_Primitives;
|
||
|
with System.Task_Info;
|
||
|
|
||
|
with System.Soft_Links;
|
||
|
-- We use System.Soft_Links instead of System.Tasking.Initialization
|
||
|
-- because the later is a higher level package that we shouldn't depend on.
|
||
|
-- For example when using the restricted run time, it is replaced by
|
||
|
-- System.Tasking.Restricted.Stages.
|
||
|
|
||
|
package body System.Task_Primitives.Operations is
|
||
|
|
||
|
package SSL renames System.Soft_Links;
|
||
|
|
||
|
use System.Tasking.Debug;
|
||
|
use System.Tasking;
|
||
|
use Interfaces.C;
|
||
|
use System.OS_Interface;
|
||
|
use System.Parameters;
|
||
|
use System.OS_Primitives;
|
||
|
|
||
|
----------------
|
||
|
-- Local Data --
|
||
|
----------------
|
||
|
|
||
|
-- The followings are logically constants, but need to be initialized
|
||
|
-- at run time.
|
||
|
|
||
|
Single_RTS_Lock : aliased RTS_Lock;
|
||
|
-- This is a lock to allow only one thread of control in the RTS at
|
||
|
-- a time; it is used to execute in mutual exclusion from all other tasks.
|
||
|
-- Used mainly in Single_Lock mode, but also to protect All_Tasks_List
|
||
|
|
||
|
ATCB_Key : aliased pthread_key_t;
|
||
|
-- Key used to find the Ada Task_Id associated with a thread
|
||
|
|
||
|
Environment_Task_Id : Task_Id;
|
||
|
-- A variable to hold Task_Id for the environment task
|
||
|
|
||
|
Locking_Policy : Character;
|
||
|
pragma Import (C, Locking_Policy, "__gl_locking_policy");
|
||
|
-- Value of the pragma Locking_Policy:
|
||
|
-- 'C' for Ceiling_Locking
|
||
|
-- 'I' for Inherit_Locking
|
||
|
-- ' ' for none.
|
||
|
|
||
|
Unblocked_Signal_Mask : aliased sigset_t;
|
||
|
-- The set of signals that should unblocked in all tasks
|
||
|
|
||
|
-- The followings are internal configuration constants needed
|
||
|
|
||
|
Next_Serial_Number : Task_Serial_Number := 100;
|
||
|
-- We start at 100, to reserve some special values for
|
||
|
-- using in error checking.
|
||
|
|
||
|
Time_Slice_Val : Integer;
|
||
|
pragma Import (C, Time_Slice_Val, "__gl_time_slice_val");
|
||
|
|
||
|
Dispatching_Policy : Character;
|
||
|
pragma Import (C, Dispatching_Policy, "__gl_task_dispatching_policy");
|
||
|
|
||
|
Foreign_Task_Elaborated : aliased Boolean := True;
|
||
|
-- Used to identified fake tasks (i.e., non-Ada Threads)
|
||
|
|
||
|
--------------------
|
||
|
-- Local Packages --
|
||
|
--------------------
|
||
|
|
||
|
package Specific is
|
||
|
|
||
|
procedure Initialize (Environment_Task : Task_Id);
|
||
|
pragma Inline (Initialize);
|
||
|
-- Initialize various data needed by this package
|
||
|
|
||
|
function Is_Valid_Task return Boolean;
|
||
|
pragma Inline (Is_Valid_Task);
|
||
|
-- Does the current thread have an ATCB?
|
||
|
|
||
|
procedure Set (Self_Id : Task_Id);
|
||
|
pragma Inline (Set);
|
||
|
-- Set the self id for the current task
|
||
|
|
||
|
function Self return Task_Id;
|
||
|
pragma Inline (Self);
|
||
|
-- Return a pointer to the Ada Task Control Block of the calling task
|
||
|
|
||
|
end Specific;
|
||
|
|
||
|
package body Specific is separate;
|
||
|
-- The body of this package is target specific
|
||
|
|
||
|
---------------------------------
|
||
|
-- Support for foreign threads --
|
||
|
---------------------------------
|
||
|
|
||
|
function Register_Foreign_Thread (Thread : Thread_Id) return Task_Id;
|
||
|
-- Allocate and Initialize a new ATCB for the current Thread
|
||
|
|
||
|
function Register_Foreign_Thread
|
||
|
(Thread : Thread_Id) return Task_Id is separate;
|
||
|
|
||
|
-----------------------
|
||
|
-- Local Subprograms --
|
||
|
-----------------------
|
||
|
|
||
|
procedure Abort_Handler (Sig : Signal);
|
||
|
-- Signal handler used to implement asynchronous abort
|
||
|
|
||
|
procedure Set_OS_Priority (T : Task_Id; Prio : System.Any_Priority);
|
||
|
-- This procedure calls the scheduler of the OS to set thread's priority
|
||
|
|
||
|
-------------------
|
||
|
-- Abort_Handler --
|
||
|
-------------------
|
||
|
|
||
|
procedure Abort_Handler (Sig : Signal) is
|
||
|
pragma Unreferenced (Sig);
|
||
|
|
||
|
T : constant Task_Id := Self;
|
||
|
Result : Interfaces.C.int;
|
||
|
Old_Set : aliased sigset_t;
|
||
|
|
||
|
begin
|
||
|
-- It is not safe to raise an exception when using ZCX and the GCC
|
||
|
-- exception handling mechanism.
|
||
|
|
||
|
if ZCX_By_Default and then GCC_ZCX_Support then
|
||
|
return;
|
||
|
end if;
|
||
|
|
||
|
if T.Deferral_Level = 0
|
||
|
and then T.Pending_ATC_Level < T.ATC_Nesting_Level
|
||
|
and then not T.Aborting
|
||
|
then
|
||
|
T.Aborting := True;
|
||
|
|
||
|
-- Make sure signals used for RTS internal purpose are unmasked
|
||
|
|
||
|
Result :=
|
||
|
pthread_sigmask
|
||
|
(SIG_UNBLOCK,
|
||
|
Unblocked_Signal_Mask'Access,
|
||
|
Old_Set'Access);
|
||
|
pragma Assert (Result = 0);
|
||
|
|
||
|
raise Standard'Abort_Signal;
|
||
|
end if;
|
||
|
end Abort_Handler;
|
||
|
|
||
|
-----------------
|
||
|
-- Stack_Guard --
|
||
|
-----------------
|
||
|
|
||
|
procedure Stack_Guard (T : ST.Task_Id; On : Boolean) is
|
||
|
Stack_Base : constant Address := Get_Stack_Base (T.Common.LL.Thread);
|
||
|
Guard_Page_Address : Address;
|
||
|
|
||
|
Res : Interfaces.C.int;
|
||
|
|
||
|
begin
|
||
|
if Stack_Base_Available then
|
||
|
|
||
|
-- Compute the guard page address
|
||
|
|
||
|
Guard_Page_Address :=
|
||
|
Stack_Base - (Stack_Base mod Get_Page_Size) + Get_Page_Size;
|
||
|
|
||
|
if On then
|
||
|
Res := mprotect (Guard_Page_Address, Get_Page_Size, PROT_ON);
|
||
|
else
|
||
|
Res := mprotect (Guard_Page_Address, Get_Page_Size, PROT_OFF);
|
||
|
end if;
|
||
|
|
||
|
pragma Assert (Res = 0);
|
||
|
end if;
|
||
|
end Stack_Guard;
|
||
|
|
||
|
--------------------
|
||
|
-- Get_Thread_Id --
|
||
|
--------------------
|
||
|
|
||
|
function Get_Thread_Id (T : ST.Task_Id) return OSI.Thread_Id is
|
||
|
begin
|
||
|
return T.Common.LL.Thread;
|
||
|
end Get_Thread_Id;
|
||
|
|
||
|
----------
|
||
|
-- Self --
|
||
|
----------
|
||
|
|
||
|
function Self return Task_Id renames Specific.Self;
|
||
|
|
||
|
---------------------
|
||
|
-- Initialize_Lock --
|
||
|
---------------------
|
||
|
|
||
|
procedure Initialize_Lock
|
||
|
(Prio : System.Any_Priority;
|
||
|
L : not null access Lock)
|
||
|
is
|
||
|
Attributes : aliased pthread_mutexattr_t;
|
||
|
Result : Interfaces.C.int;
|
||
|
|
||
|
begin
|
||
|
Result := pthread_mutexattr_init (Attributes'Access);
|
||
|
pragma Assert (Result = 0 or else Result = ENOMEM);
|
||
|
|
||
|
if Result = ENOMEM then
|
||
|
raise Storage_Error;
|
||
|
end if;
|
||
|
|
||
|
if Locking_Policy = 'C' then
|
||
|
L.Ceiling := Prio;
|
||
|
end if;
|
||
|
|
||
|
Result := pthread_mutex_init (L.Mutex'Access, Attributes'Access);
|
||
|
pragma Assert (Result = 0 or else Result = ENOMEM);
|
||
|
|
||
|
if Result = ENOMEM then
|
||
|
raise Storage_Error;
|
||
|
end if;
|
||
|
|
||
|
Result := pthread_mutexattr_destroy (Attributes'Access);
|
||
|
pragma Assert (Result = 0);
|
||
|
end Initialize_Lock;
|
||
|
|
||
|
procedure Initialize_Lock
|
||
|
(L : not null access RTS_Lock;
|
||
|
Level : Lock_Level)
|
||
|
is
|
||
|
pragma Unreferenced (Level);
|
||
|
|
||
|
Attributes : aliased pthread_mutexattr_t;
|
||
|
Result : Interfaces.C.int;
|
||
|
|
||
|
begin
|
||
|
Result := pthread_mutexattr_init (Attributes'Access);
|
||
|
pragma Assert (Result = 0 or else Result = ENOMEM);
|
||
|
|
||
|
if Result = ENOMEM then
|
||
|
raise Storage_Error;
|
||
|
end if;
|
||
|
|
||
|
Result := pthread_mutex_init (L, Attributes'Access);
|
||
|
pragma Assert (Result = 0 or else Result = ENOMEM);
|
||
|
|
||
|
if Result = ENOMEM then
|
||
|
Result := pthread_mutexattr_destroy (Attributes'Access);
|
||
|
raise Storage_Error;
|
||
|
end if;
|
||
|
|
||
|
Result := pthread_mutexattr_destroy (Attributes'Access);
|
||
|
pragma Assert (Result = 0);
|
||
|
end Initialize_Lock;
|
||
|
|
||
|
-------------------
|
||
|
-- Finalize_Lock --
|
||
|
-------------------
|
||
|
|
||
|
procedure Finalize_Lock (L : not null access Lock) is
|
||
|
Result : Interfaces.C.int;
|
||
|
begin
|
||
|
Result := pthread_mutex_destroy (L.Mutex'Access);
|
||
|
pragma Assert (Result = 0);
|
||
|
end Finalize_Lock;
|
||
|
|
||
|
procedure Finalize_Lock (L : not null access RTS_Lock) is
|
||
|
Result : Interfaces.C.int;
|
||
|
begin
|
||
|
Result := pthread_mutex_destroy (L);
|
||
|
pragma Assert (Result = 0);
|
||
|
end Finalize_Lock;
|
||
|
|
||
|
----------------
|
||
|
-- Write_Lock --
|
||
|
----------------
|
||
|
|
||
|
procedure Write_Lock
|
||
|
(L : not null access Lock;
|
||
|
Ceiling_Violation : out Boolean)
|
||
|
is
|
||
|
Result : Interfaces.C.int;
|
||
|
T : constant Task_Id := Self;
|
||
|
|
||
|
begin
|
||
|
if Locking_Policy = 'C' then
|
||
|
if T.Common.Current_Priority > L.Ceiling then
|
||
|
Ceiling_Violation := True;
|
||
|
return;
|
||
|
end if;
|
||
|
|
||
|
L.Saved_Priority := T.Common.Current_Priority;
|
||
|
|
||
|
if T.Common.Current_Priority < L.Ceiling then
|
||
|
Set_OS_Priority (T, L.Ceiling);
|
||
|
end if;
|
||
|
end if;
|
||
|
|
||
|
Result := pthread_mutex_lock (L.Mutex'Access);
|
||
|
|
||
|
-- Assume that the cause of EINVAL is a priority ceiling violation
|
||
|
|
||
|
Ceiling_Violation := (Result = EINVAL);
|
||
|
pragma Assert (Result = 0 or else Result = EINVAL);
|
||
|
end Write_Lock;
|
||
|
|
||
|
-- No tricks on RTS_Locks
|
||
|
|
||
|
procedure Write_Lock
|
||
|
(L : not null access RTS_Lock;
|
||
|
Global_Lock : Boolean := False)
|
||
|
is
|
||
|
Result : Interfaces.C.int;
|
||
|
begin
|
||
|
if not Single_Lock or else Global_Lock then
|
||
|
Result := pthread_mutex_lock (L);
|
||
|
pragma Assert (Result = 0);
|
||
|
end if;
|
||
|
end Write_Lock;
|
||
|
|
||
|
procedure Write_Lock (T : Task_Id) is
|
||
|
Result : Interfaces.C.int;
|
||
|
begin
|
||
|
if not Single_Lock then
|
||
|
Result := pthread_mutex_lock (T.Common.LL.L'Access);
|
||
|
pragma Assert (Result = 0);
|
||
|
end if;
|
||
|
end Write_Lock;
|
||
|
|
||
|
---------------
|
||
|
-- Read_Lock --
|
||
|
---------------
|
||
|
|
||
|
procedure Read_Lock
|
||
|
(L : not null access Lock;
|
||
|
Ceiling_Violation : out Boolean)
|
||
|
is
|
||
|
begin
|
||
|
Write_Lock (L, Ceiling_Violation);
|
||
|
end Read_Lock;
|
||
|
|
||
|
------------
|
||
|
-- Unlock --
|
||
|
------------
|
||
|
|
||
|
procedure Unlock (L : not null access Lock) is
|
||
|
Result : Interfaces.C.int;
|
||
|
T : constant Task_Id := Self;
|
||
|
|
||
|
begin
|
||
|
Result := pthread_mutex_unlock (L.Mutex'Access);
|
||
|
pragma Assert (Result = 0);
|
||
|
|
||
|
if Locking_Policy = 'C' then
|
||
|
if T.Common.Current_Priority > L.Saved_Priority then
|
||
|
Set_OS_Priority (T, L.Saved_Priority);
|
||
|
end if;
|
||
|
end if;
|
||
|
end Unlock;
|
||
|
|
||
|
procedure Unlock
|
||
|
(L : not null access RTS_Lock;
|
||
|
Global_Lock : Boolean := False)
|
||
|
is
|
||
|
Result : Interfaces.C.int;
|
||
|
begin
|
||
|
if not Single_Lock or else Global_Lock then
|
||
|
Result := pthread_mutex_unlock (L);
|
||
|
pragma Assert (Result = 0);
|
||
|
end if;
|
||
|
end Unlock;
|
||
|
|
||
|
procedure Unlock (T : Task_Id) is
|
||
|
Result : Interfaces.C.int;
|
||
|
begin
|
||
|
if not Single_Lock then
|
||
|
Result := pthread_mutex_unlock (T.Common.LL.L'Access);
|
||
|
pragma Assert (Result = 0);
|
||
|
end if;
|
||
|
end Unlock;
|
||
|
|
||
|
-----------------
|
||
|
-- Set_Ceiling --
|
||
|
-----------------
|
||
|
|
||
|
-- Dynamic priority ceilings are not supported by the underlying system
|
||
|
|
||
|
procedure Set_Ceiling
|
||
|
(L : not null access Lock;
|
||
|
Prio : System.Any_Priority)
|
||
|
is
|
||
|
pragma Unreferenced (L, Prio);
|
||
|
begin
|
||
|
null;
|
||
|
end Set_Ceiling;
|
||
|
|
||
|
-----------
|
||
|
-- Sleep --
|
||
|
-----------
|
||
|
|
||
|
procedure Sleep
|
||
|
(Self_ID : Task_Id;
|
||
|
Reason : System.Tasking.Task_States)
|
||
|
is
|
||
|
pragma Unreferenced (Reason);
|
||
|
Result : Interfaces.C.int;
|
||
|
|
||
|
begin
|
||
|
if Single_Lock then
|
||
|
Result :=
|
||
|
pthread_cond_wait
|
||
|
(Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access);
|
||
|
else
|
||
|
Result :=
|
||
|
pthread_cond_wait
|
||
|
(Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access);
|
||
|
end if;
|
||
|
|
||
|
-- EINTR is not considered a failure
|
||
|
|
||
|
pragma Assert (Result = 0 or else Result = EINTR);
|
||
|
end Sleep;
|
||
|
|
||
|
-----------------
|
||
|
-- Timed_Sleep --
|
||
|
-----------------
|
||
|
|
||
|
-- This is for use within the run-time system, so abort is
|
||
|
-- assumed to be already deferred, and the caller should be
|
||
|
-- holding its own ATCB lock.
|
||
|
|
||
|
procedure Timed_Sleep
|
||
|
(Self_ID : Task_Id;
|
||
|
Time : Duration;
|
||
|
Mode : ST.Delay_Modes;
|
||
|
Reason : Task_States;
|
||
|
Timedout : out Boolean;
|
||
|
Yielded : out Boolean)
|
||
|
is
|
||
|
pragma Unreferenced (Reason);
|
||
|
|
||
|
Base_Time : constant Duration := Monotonic_Clock;
|
||
|
Check_Time : Duration := Base_Time;
|
||
|
Rel_Time : Duration;
|
||
|
Abs_Time : Duration;
|
||
|
Request : aliased timespec;
|
||
|
Result : Interfaces.C.int;
|
||
|
|
||
|
begin
|
||
|
Timedout := True;
|
||
|
Yielded := False;
|
||
|
|
||
|
if Mode = Relative then
|
||
|
Abs_Time := Duration'Min (Time, Max_Sensible_Delay) + Check_Time;
|
||
|
|
||
|
if Relative_Timed_Wait then
|
||
|
Rel_Time := Duration'Min (Max_Sensible_Delay, Time);
|
||
|
end if;
|
||
|
|
||
|
else
|
||
|
Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time);
|
||
|
|
||
|
if Relative_Timed_Wait then
|
||
|
Rel_Time := Duration'Min (Max_Sensible_Delay, Time - Check_Time);
|
||
|
end if;
|
||
|
end if;
|
||
|
|
||
|
if Abs_Time > Check_Time then
|
||
|
if Relative_Timed_Wait then
|
||
|
Request := To_Timespec (Rel_Time);
|
||
|
else
|
||
|
Request := To_Timespec (Abs_Time);
|
||
|
end if;
|
||
|
|
||
|
loop
|
||
|
exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level;
|
||
|
|
||
|
if Single_Lock then
|
||
|
Result :=
|
||
|
pthread_cond_timedwait
|
||
|
(Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access,
|
||
|
Request'Access);
|
||
|
|
||
|
else
|
||
|
Result :=
|
||
|
pthread_cond_timedwait
|
||
|
(Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access,
|
||
|
Request'Access);
|
||
|
end if;
|
||
|
|
||
|
Check_Time := Monotonic_Clock;
|
||
|
exit when Abs_Time <= Check_Time or else Check_Time < Base_Time;
|
||
|
|
||
|
if Result = 0 or Result = EINTR then
|
||
|
|
||
|
-- Somebody may have called Wakeup for us
|
||
|
|
||
|
Timedout := False;
|
||
|
exit;
|
||
|
end if;
|
||
|
|
||
|
pragma Assert (Result = ETIMEDOUT);
|
||
|
end loop;
|
||
|
end if;
|
||
|
end Timed_Sleep;
|
||
|
|
||
|
-----------------
|
||
|
-- Timed_Delay --
|
||
|
-----------------
|
||
|
|
||
|
-- This is for use in implementing delay statements, so we assume
|
||
|
-- the caller is abort-deferred but is holding no locks.
|
||
|
|
||
|
procedure Timed_Delay
|
||
|
(Self_ID : Task_Id;
|
||
|
Time : Duration;
|
||
|
Mode : ST.Delay_Modes)
|
||
|
is
|
||
|
Base_Time : constant Duration := Monotonic_Clock;
|
||
|
Check_Time : Duration := Base_Time;
|
||
|
Abs_Time : Duration;
|
||
|
Rel_Time : Duration;
|
||
|
Request : aliased timespec;
|
||
|
|
||
|
Result : Interfaces.C.int;
|
||
|
pragma Warnings (Off, Result);
|
||
|
|
||
|
begin
|
||
|
if Single_Lock then
|
||
|
Lock_RTS;
|
||
|
end if;
|
||
|
|
||
|
-- Comments needed in code below ???
|
||
|
|
||
|
Write_Lock (Self_ID);
|
||
|
|
||
|
if Mode = Relative then
|
||
|
Abs_Time := Duration'Min (Time, Max_Sensible_Delay) + Check_Time;
|
||
|
|
||
|
if Relative_Timed_Wait then
|
||
|
Rel_Time := Duration'Min (Max_Sensible_Delay, Time);
|
||
|
end if;
|
||
|
|
||
|
else
|
||
|
Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time);
|
||
|
|
||
|
if Relative_Timed_Wait then
|
||
|
Rel_Time := Duration'Min (Max_Sensible_Delay, Time - Check_Time);
|
||
|
end if;
|
||
|
end if;
|
||
|
|
||
|
if Abs_Time > Check_Time then
|
||
|
if Relative_Timed_Wait then
|
||
|
Request := To_Timespec (Rel_Time);
|
||
|
else
|
||
|
Request := To_Timespec (Abs_Time);
|
||
|
end if;
|
||
|
|
||
|
Self_ID.Common.State := Delay_Sleep;
|
||
|
|
||
|
loop
|
||
|
exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level;
|
||
|
|
||
|
if Single_Lock then
|
||
|
Result :=
|
||
|
pthread_cond_timedwait
|
||
|
(Self_ID.Common.LL.CV'Access,
|
||
|
Single_RTS_Lock'Access,
|
||
|
Request'Access);
|
||
|
else
|
||
|
Result :=
|
||
|
pthread_cond_timedwait
|
||
|
(Self_ID.Common.LL.CV'Access,
|
||
|
Self_ID.Common.LL.L'Access,
|
||
|
Request'Access);
|
||
|
end if;
|
||
|
|
||
|
Check_Time := Monotonic_Clock;
|
||
|
exit when Abs_Time <= Check_Time or else Check_Time < Base_Time;
|
||
|
|
||
|
pragma Assert (Result = 0 or else
|
||
|
Result = ETIMEDOUT or else
|
||
|
Result = EINTR);
|
||
|
end loop;
|
||
|
|
||
|
Self_ID.Common.State := Runnable;
|
||
|
end if;
|
||
|
|
||
|
Unlock (Self_ID);
|
||
|
|
||
|
if Single_Lock then
|
||
|
Unlock_RTS;
|
||
|
end if;
|
||
|
|
||
|
Result := sched_yield;
|
||
|
end Timed_Delay;
|
||
|
|
||
|
---------------------
|
||
|
-- Monotonic_Clock --
|
||
|
---------------------
|
||
|
|
||
|
function Monotonic_Clock return Duration is
|
||
|
TS : aliased timespec;
|
||
|
Result : Interfaces.C.int;
|
||
|
begin
|
||
|
Result :=
|
||
|
clock_gettime
|
||
|
(clock_id => CLOCK_REALTIME, tp => TS'Unchecked_Access);
|
||
|
pragma Assert (Result = 0);
|
||
|
return To_Duration (TS);
|
||
|
end Monotonic_Clock;
|
||
|
|
||
|
-------------------
|
||
|
-- RT_Resolution --
|
||
|
-------------------
|
||
|
|
||
|
function RT_Resolution return Duration is
|
||
|
Res : aliased timespec;
|
||
|
Result : Interfaces.C.int;
|
||
|
begin
|
||
|
Result :=
|
||
|
clock_getres
|
||
|
(clock_id => CLOCK_REALTIME, res => Res'Unchecked_Access);
|
||
|
pragma Assert (Result = 0);
|
||
|
return To_Duration (Res);
|
||
|
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_OS_Priority (T : Task_Id; Prio : System.Any_Priority) is
|
||
|
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
|
||
|
Param.sched_priority := Interfaces.C.int (Prio);
|
||
|
|
||
|
if Time_Slice_Supported
|
||
|
and then (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
|
||
|
Result :=
|
||
|
pthread_setschedparam
|
||
|
(T.Common.LL.Thread, SCHED_OTHER, Param'Access);
|
||
|
end if;
|
||
|
|
||
|
pragma Assert (Result = 0);
|
||
|
end Set_OS_Priority;
|
||
|
|
||
|
type Prio_Array_Type is array (System.Any_Priority) of Integer;
|
||
|
pragma Atomic_Components (Prio_Array_Type);
|
||
|
Prio_Array : Prio_Array_Type;
|
||
|
-- Comments needed for these declarations ???
|
||
|
|
||
|
procedure Set_Priority
|
||
|
(T : Task_Id;
|
||
|
Prio : System.Any_Priority;
|
||
|
Loss_Of_Inheritance : Boolean := False)
|
||
|
is
|
||
|
Array_Item : Integer;
|
||
|
|
||
|
begin
|
||
|
Set_OS_Priority (T, Prio);
|
||
|
|
||
|
if Locking_Policy = 'C' then
|
||
|
|
||
|
-- Annex D requirements: loss of inheritance puts task at the start
|
||
|
-- of the queue for that prio; copied from 5ztaprop (VxWorks).
|
||
|
|
||
|
if Loss_Of_Inheritance
|
||
|
and then Prio < T.Common.Current_Priority then
|
||
|
|
||
|
Array_Item := Prio_Array (T.Common.Base_Priority) + 1;
|
||
|
Prio_Array (T.Common.Base_Priority) := Array_Item;
|
||
|
|
||
|
loop
|
||
|
Yield;
|
||
|
exit when Array_Item = Prio_Array (T.Common.Base_Priority)
|
||
|
or else Prio_Array (T.Common.Base_Priority) = 1;
|
||
|
end loop;
|
||
|
|
||
|
Prio_Array (T.Common.Base_Priority) :=
|
||
|
Prio_Array (T.Common.Base_Priority) - 1;
|
||
|
end if;
|
||
|
end if;
|
||
|
|
||
|
T.Common.Current_Priority := Prio;
|
||
|
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;
|
||
|
Self_ID.Common.LL.LWP := lwp_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;
|
||
|
|
||
|
-------------------
|
||
|
-- 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
|
||
|
-- Give the task a unique serial number
|
||
|
|
||
|
Self_ID.Serial_Number := Next_Serial_Number;
|
||
|
Next_Serial_Number := Next_Serial_Number + 1;
|
||
|
pragma Assert (Next_Serial_Number /= 0);
|
||
|
|
||
|
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;
|
||
|
|
||
|
use System.Task_Info;
|
||
|
|
||
|
begin
|
||
|
Adjusted_Stack_Size := Interfaces.C.size_t (Stack_Size);
|
||
|
|
||
|
if Stack_Base_Available then
|
||
|
|
||
|
-- If Stack Checking is supported then allocate 2 additional pages:
|
||
|
|
||
|
-- In the worst case, stack is allocated at something like
|
||
|
-- N * Get_Page_Size - epsilon, we need to add the size for 2 pages
|
||
|
-- to be sure the effective stack size is greater than what
|
||
|
-- has been asked.
|
||
|
|
||
|
Adjusted_Stack_Size := Adjusted_Stack_Size + 2 * Get_Page_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);
|
||
|
|
||
|
if T.Common.Task_Info /= Default_Scope then
|
||
|
|
||
|
-- We are assuming that Scope_Type has the same values than the
|
||
|
-- corresponding C macros
|
||
|
|
||
|
Result :=
|
||
|
pthread_attr_setscope
|
||
|
(Attributes'Access, Task_Info_Type'Pos (T.Common.Task_Info));
|
||
|
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 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);
|
||
|
|
||
|
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);
|
||
|
|
||
|
if Is_Self then
|
||
|
Result := st_setspecific (ATCB_Key, System.Null_Address);
|
||
|
pragma Assert (Result = 0);
|
||
|
end if;
|
||
|
end Finalize_TCB;
|
||
|
|
||
|
---------------
|
||
|
-- Exit_Task --
|
||
|
---------------
|
||
|
|
||
|
procedure Exit_Task is
|
||
|
begin
|
||
|
Specific.Set (null);
|
||
|
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;
|
||
|
|
||
|
----------------
|
||
|
-- 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 (RM 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, just leave state set 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 (RM D.10(9)).
|
||
|
|
||
|
if S.State then
|
||
|
S.State := False;
|
||
|
else
|
||
|
S.Waiting := True;
|
||
|
Result := pthread_cond_wait (S.CV'Access, S.L'Access);
|
||
|
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
|
||
|
act : aliased struct_sigaction;
|
||
|
old_act : aliased struct_sigaction;
|
||
|
Tmp_Set : aliased sigset_t;
|
||
|
Result : Interfaces.C.int;
|
||
|
|
||
|
function State
|
||
|
(Int : System.Interrupt_Management.Interrupt_ID) return Character;
|
||
|
pragma Import (C, State, "__gnat_get_interrupt_state");
|
||
|
-- Get interrupt state. Defined in a-init.c
|
||
|
-- The input argument is the interrupt number,
|
||
|
-- and the result is one of the following:
|
||
|
|
||
|
Default : constant Character := 's';
|
||
|
-- 'n' this interrupt not set by any Interrupt_State pragma
|
||
|
-- 'u' Interrupt_State pragma set state to User
|
||
|
-- 'r' Interrupt_State pragma set state to Runtime
|
||
|
-- 's' Interrupt_State pragma set state to System (use "default"
|
||
|
-- system handler)
|
||
|
|
||
|
begin
|
||
|
Environment_Task_Id := Environment_Task;
|
||
|
|
||
|
Interrupt_Management.Initialize;
|
||
|
|
||
|
-- 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;
|
||
|
|
||
|
-- Initialize the lock used to synchronize chain of all ATCBs
|
||
|
|
||
|
Initialize_Lock (Single_RTS_Lock'Access, RTS_Lock_Level);
|
||
|
|
||
|
Specific.Initialize (Environment_Task);
|
||
|
|
||
|
Enter_Task (Environment_Task);
|
||
|
|
||
|
-- Install the abort-signal handler
|
||
|
|
||
|
if State
|
||
|
(System.Interrupt_Management.Abort_Task_Interrupt) /= Default
|
||
|
then
|
||
|
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 if;
|
||
|
end Initialize;
|
||
|
|
||
|
end System.Task_Primitives.Operations;
|