-- --
-- B o d y --
-- --
--- Copyright (C) 1992-2006, Free Software Foundation, Inc. --
+-- 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 2, or (at your option) any later ver- --
--- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
+-- 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. See the GNU General Public License --
--- for more details. You should have received a copy of the GNU General --
--- Public License distributed with GNARL; see file COPYING. If not, write --
--- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
--- Boston, MA 02110-1301, USA. --
+-- or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
--- As a special exception, if other files instantiate generics from this --
--- unit, or you link this unit with other files to produce an executable, --
--- this unit does not by itself cause the resulting executable to be --
--- covered by the GNU General Public License. This exception does not --
--- however invalidate any other reasons why the executable file might be --
--- covered by the GNU Public License. --
+-- 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 OpenVMS/Alpha version of this package
--- This package contains all the GNULL primitives that interface directly
--- with the underlying OS.
+-- 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.
+-- Turn off polling, we do not want ATC polling to take place during tasking
+-- operations. It causes infinite loops and other problems.
-with System.Tasking.Debug;
--- used for Known_Tasks
-
-with System.OS_Primitives;
--- used for Delay_Modes
+with Ada.Unchecked_Conversion;
+with Ada.Unchecked_Deallocation;
with Interfaces.C;
--- used for int
--- size_t
+with System.Tasking.Debug;
+with System.OS_Primitives;
with System.Soft_Links;
--- used for Get_Exc_Stack_Addr
--- Abort_Defer/Undefer
-
-with Unchecked_Conversion;
-with Unchecked_Deallocation;
+with System.Aux_DEC;
package body System.Task_Primitives.Operations is
-- 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.
+ -- A variable to hold Task_Id for the environment task
Time_Slice_Val : Integer;
pragma Import (C, Time_Slice_Val, "__gl_time_slice_val");
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).
+ -- Used to identified fake tasks (i.e., non-Ada Threads)
--------------------
-- Local Packages --
procedure Initialize (Environment_Task : Task_Id);
pragma Inline (Initialize);
- -- Initialize various data needed by this package.
+ -- Initialize various data needed by this package
function Is_Valid_Task return Boolean;
pragma Inline (Is_Valid_Task);
end Specific;
package body Specific is separate;
- -- The body of this package is target specific.
+ -- The body of this package is target specific
---------------------------------
-- Support for foreign threads --
-- Local Subprograms --
-----------------------
- function To_Task_Id is new Unchecked_Conversion (System.Address, Task_Id);
+ function To_Task_Id is
+ new Ada.Unchecked_Conversion
+ (System.Task_Primitives.Task_Address, Task_Id);
- function To_Address is new Unchecked_Conversion (Task_Id, System.Address);
+ function To_Address is
+ new Ada.Unchecked_Conversion
+ (Task_Id, System.Task_Primitives.Task_Address);
function Get_Exc_Stack_Addr return Address;
-- Replace System.Soft_Links.Get_Exc_Stack_Addr_NT
procedure Timer_Sleep_AST (ID : Address);
- -- Signal the condition variable when AST fires.
+ pragma Convention (C, Timer_Sleep_AST);
+ -- Signal the condition variable when AST fires
procedure Timer_Sleep_AST (ID : Address) is
- Result : Interfaces.C.int;
+ Result : Interfaces.C.int;
+ pragma Warnings (Off, Result);
Self_ID : constant Task_Id := To_Task_Id (ID);
begin
Self_ID.Common.LL.AST_Pending := False;
-- Stack_Guard --
-----------------
- -- The underlying thread system sets a guard page at the
- -- bottom of a thread stack, so nothing is needed.
+ -- The underlying thread system sets a guard page at the bottom of a thread
+ -- stack, so nothing is needed.
-- ??? Check the comment above
procedure Stack_Guard (T : ST.Task_Id; On : Boolean) is
-- Initialize_Lock --
---------------------
- -- Note: mutexes and cond_variables needed per-task basis are
- -- initialized in Initialize_TCB and the Storage_Error is
- -- handled. Other mutexes (such as RTS_Lock, Memory_Lock...)
- -- used in RTS is initialized before any status change of RTS.
- -- Therefore rasing Storage_Error in the following routines
- -- should be able to be handled safely.
+ -- Note: mutexes and cond_variables needed per-task basis are initialized
+ -- in Initialize_TCB and the Storage_Error is handled. Other mutexes (such
+ -- as RTS_Lock, Memory_Lock...) used in RTS is initialized before any
+ -- status change of RTS. Therefore raising Storage_Error in the following
+ -- routines should be able to be handled safely.
procedure Initialize_Lock
- (Prio : System.Any_Priority; L : not null access Lock)
+ (Prio : System.Any_Priority;
+ L : not null access Lock)
is
Attributes : aliased pthread_mutexattr_t;
Result : Interfaces.C.int;
end Initialize_Lock;
procedure Initialize_Lock
- (L : not null access RTS_Lock; Level : Lock_Level)
+ (L : not null access RTS_Lock;
+ Level : Lock_Level)
is
pragma Unreferenced (Level);
----------------
procedure Write_Lock
- (L : not null access Lock; Ceiling_Violation : out Boolean)
+ (L : not null access Lock;
+ Ceiling_Violation : out Boolean)
is
Self_ID : constant Task_Id := Self;
All_Tasks_Link : constant Task_Id := Self.Common.All_Tasks_Link;
---------------
procedure Read_Lock
- (L : not null access Lock; Ceiling_Violation : out Boolean) is
+ (L : not null access Lock;
+ Ceiling_Violation : out Boolean)
+ is
begin
Write_Lock (L, Ceiling_Violation);
end Read_Lock;
end Unlock;
procedure Unlock
- (L : not null access RTS_Lock; Global_Lock : Boolean := False)
+ (L : not null access RTS_Lock;
+ Global_Lock : Boolean := False)
is
Result : Interfaces.C.int;
begin
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 --
-----------
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;
+ Result :=
+ pthread_cond_wait
+ (cond => Self_ID.Common.LL.CV'Access,
+ mutex => (if Single_Lock
+ then Single_RTS_Lock'Access
+ else Self_ID.Common.LL.L'Access));
-- EINTR is not considered a failure
Sleep_Time := To_OS_Time (Time, Mode);
- if Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level
- or else Self_ID.Pending_Priority_Change
- then
+ if Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level then
return;
end if;
end if;
if Single_Lock then
- Result := pthread_cond_wait
- (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access);
+ Result :=
+ pthread_cond_wait
+ (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access);
pragma Assert (Result = 0);
else
- Result := pthread_cond_wait
- (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access);
+ Result :=
+ pthread_cond_wait
+ (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access);
pragma Assert (Result = 0);
end if;
if Time /= 0.0 or else Mode /= Relative then
Sleep_Time := To_OS_Time (Time, Mode);
- if Mode = Relative or else OS_Clock < Sleep_Time then
+ if Mode = Relative or else OS_Clock <= Sleep_Time then
Self_ID.Common.State := Delay_Sleep;
Self_ID.Common.LL.AST_Pending := True;
(Status, 0, Sleep_Time,
Timer_Sleep_AST'Access, To_Address (Self_ID), 0);
+ -- Comment following test
+
if (Status and 1) /= 1 then
raise Storage_Error;
end if;
loop
- if Self_ID.Pending_Priority_Change then
- Self_ID.Pending_Priority_Change := False;
- Self_ID.Common.Base_Priority := Self_ID.New_Base_Priority;
- Set_Priority (Self_ID, Self_ID.Common.Base_Priority);
- end if;
-
if Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level then
Sys_Cantim (Status, To_Address (Self_ID), 0);
pragma Assert ((Status and 1) = 1);
exit;
end if;
- if Single_Lock then
- Result := pthread_cond_wait
- (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access);
- pragma Assert (Result = 0);
- else
- Result := pthread_cond_wait
- (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access);
- pragma Assert (Result = 0);
- end if;
+ Result :=
+ pthread_cond_wait
+ (cond => Self_ID.Common.LL.CV'Access,
+ mutex => (if Single_Lock
+ then Single_RTS_Lock'Access
+ else Self_ID.Common.LL.L'Access));
+ pragma Assert (Result = 0);
Yielded := True;
function RT_Resolution return Duration is
begin
+ -- Document origin of this magic constant ???
return 10#1.0#E-3;
end RT_Resolution;
or else Priority_Specific_Policy = 'R'
or else Time_Slice_Val > 0
then
- Result := pthread_setschedparam
- (T.Common.LL.Thread, SCHED_RR, Param'Access);
+ 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);
+ Result :=
+ pthread_setschedparam
+ (T.Common.LL.Thread, SCHED_FIFO, Param'Access);
else
-- SCHED_OTHER priorities are restricted to the range 8 - 15.
-- 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);
+ Result :=
+ pthread_setschedparam
+ (T.Common.LL.Thread, SCHED_OTHER, Param'Access);
end if;
pragma Assert (Result = 0);
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;
--------------
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);
+ Result :=
+ pthread_mutex_init
+ (Self_ID.Common.LL.L'Access, Mutex_Attr'Access);
pragma Assert (Result = 0 or else Result = ENOMEM);
end if;
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);
+ Result :=
+ pthread_cond_init
+ (Self_ID.Common.LL.CV'Access, Cond_Attr'Access);
pragma Assert (Result = 0 or else Result = ENOMEM);
end if;
Result : Interfaces.C.int;
function Thread_Body_Access is new
- Unchecked_Conversion (System.Address, Thread_Body);
+ 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 mask all signals
+ -- 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.
(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));
+ Result :=
+ pthread_create
+ (T.Common.LL.Thread'Access,
+ Attributes'Access,
+ Thread_Body_Access (Wrapper),
+ To_Address (T));
- -- ENOMEM is a valid run-time error. Don't shut down.
+ -- ENOMEM is a valid run-time error -- do not shut down
pragma Assert (Result = 0
or else Result = EAGAIN or else Result = ENOMEM);
Is_Self : constant Boolean := T = Self;
procedure Free is new
- Unchecked_Deallocation (Ada_Task_Control_Block, Task_Id);
+ Ada.Unchecked_Deallocation (Ada_Task_Control_Block, Task_Id);
- procedure Free is new Unchecked_Deallocation
+ procedure Free is new Ada.Unchecked_Deallocation
(Exc_Stack_T, Exc_Stack_Ptr_T);
begin
end if;
Free (T.Common.LL.Exc_Stack_Ptr);
-
Free (Tmp);
if Is_Self then
Cond_Attr : aliased pthread_condattr_t;
Result : Interfaces.C.int;
begin
- -- Initialize internal state. It is always initialized to False (ARM
- -- D.10 par. 6).
+ -- Initialize internal state (always to False (D.10 (6)))
S.State := False;
S.Waiting := False;
--------------
procedure Finalize (S : in out Suspension_Object) is
- Result : Interfaces.C.int;
+ Result : Interfaces.C.int;
+
begin
-- Destroy internal mutex
---------------
procedure Set_False (S : in out Suspension_Object) is
- Result : Interfaces.C.int;
+ Result : Interfaces.C.int;
+
begin
SSL.Abort_Defer.all;
procedure Set_True (S : in out Suspension_Object) is
Result : Interfaces.C.int;
+
begin
SSL.Abort_Defer.all;
-- 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 it is specified in ARM D.10 par. 9. Otherwise, it just leaves
- -- the state to True.
+ -- as specified in (RM D.10(9)), otherwise leave state set to True.
if S.Waiting then
S.Waiting := False;
Result := pthread_cond_signal (S.CV'Access);
pragma Assert (Result = 0);
+
else
S.State := True;
end if;
procedure Suspend_Until_True (S : in out Suspension_Object) is
Result : Interfaces.C.int;
+
begin
SSL.Abort_Defer.all;
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
- -- (ARM D.10 par. 10).
+ -- (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
S.State := False;
else
S.Waiting := True;
- Result := pthread_cond_wait (S.CV'Access, S.L'Access);
+
+ 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);
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;
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;
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