-- --
-- 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 LynxOS version of this file, adapted to make
--- SCHED_FIFO and ceiling locking (Annex D compliance) work properly
+-- 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.
+-- 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 Ada.Unchecked_Deallocation;
-with System.Interrupt_Management;
--- used for Keep_Unmasked
--- Abort_Task_Interrupt
--- Interrupt_ID
+with Interfaces.C;
+with System.Tasking.Debug;
+with System.Interrupt_Management;
with System.OS_Primitives;
--- used for Delay_Modes
-
with System.Task_Info;
--- used for Task_Info_Type
-
-with Interfaces.C;
--- used for int
--- size_t
with System.Soft_Links;
--- used for Abort_Defer/Undefer
-
-- 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.
-with Unchecked_Deallocation;
-
package body System.Task_Primitives.Operations is
package SSL renames System.Soft_Links;
end if;
if T.Deferral_Level = 0
- and then T.Pending_ATC_Level < T.ATC_Nesting_Level and then
- not T.Aborting
+ 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'Unchecked_Access,
- Old_Set'Unchecked_Access);
+ pthread_sigmask
+ (SIG_UNBLOCK,
+ Unblocked_Signal_Mask'Access,
+ Old_Set'Access);
pragma Assert (Result = 0);
raise Standard'Abort_Signal;
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);
Attributes : aliased pthread_mutexattr_t;
- Result : Interfaces.C.int;
+ Result : Interfaces.C.int;
begin
Result := pthread_mutexattr_init (Attributes'Access);
----------------
procedure Write_Lock
- (L : not null access Lock; Ceiling_Violation : out Boolean)
+ (L : not null access Lock;
+ Ceiling_Violation : out Boolean)
is
Result : Interfaces.C.int;
- T : constant Task_Id := Self;
+ T : constant Task_Id := Self;
begin
if Locking_Policy = 'C' then
-- No tricks on RTS_Locks
procedure Write_Lock
- (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
---------------
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;
procedure Unlock (L : not null access Lock) is
Result : Interfaces.C.int;
- T : constant Task_Id := Self;
+ T : constant Task_Id := Self;
begin
Result := pthread_mutex_unlock (L.Mutex'Access);
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 --
-----------
begin
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);
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);
end if;
-- EINTR is not considered a failure
is
pragma Unreferenced (Reason);
- Check_Time : constant Duration := Monotonic_Clock;
+ Base_Time : constant Duration := Monotonic_Clock;
+ Check_Time : Duration := Base_Time;
Rel_Time : Duration;
Abs_Time : Duration;
Request : aliased timespec;
end if;
loop
- exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level
- or else Self_ID.Pending_Priority_Change;
+ 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);
+ 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);
+ Result :=
+ pthread_cond_timedwait
+ (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access,
+ Request'Access);
end if;
- exit when Abs_Time <= Monotonic_Clock;
+ Check_Time := Monotonic_Clock;
+ exit when Abs_Time <= Check_Time or else Check_Time < Base_Time;
if Result = 0 or Result = EINTR then
Time : Duration;
Mode : ST.Delay_Modes)
is
- Check_Time : constant Duration := Monotonic_Clock;
+ Base_Time : constant Duration := Monotonic_Clock;
+ Check_Time : Duration := Base_Time;
Abs_Time : Duration;
Rel_Time : Duration;
Request : aliased timespec;
Self_ID.Common.State := Delay_Sleep;
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;
-
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);
+ 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);
+ Result :=
+ pthread_cond_timedwait
+ (Self_ID.Common.LL.CV'Access,
+ Self_ID.Common.LL.L'Access,
+ Request'Access);
end if;
- exit when Abs_Time <= Monotonic_Clock;
+ 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);
+ pragma Assert (Result = 0 or else
+ Result = ETIMEDOUT or else
+ Result = EINTR);
end loop;
Self_ID.Common.State := Runnable;
TS : aliased timespec;
Result : Interfaces.C.int;
begin
- Result := clock_gettime
- (clock_id => CLOCK_REALTIME, tp => TS'Unchecked_Access);
+ Result :=
+ clock_gettime
+ (clock_id => CLOCK_REALTIME, tp => TS'Unchecked_Access);
pragma Assert (Result = 0);
return To_Duration (TS);
end Monotonic_Clock;
Res : aliased timespec;
Result : Interfaces.C.int;
begin
- Result := clock_getres
- (clock_id => CLOCK_REALTIME, Res => Res'Unchecked_Access);
+ Result :=
+ clock_getres
+ (clock_id => CLOCK_REALTIME, res => Res'Unchecked_Access);
pragma Assert (Result = 0);
return To_Duration (Res);
end RT_Resolution;
if Time_Slice_Supported
and then (Dispatching_Policy = 'R'
- or else Priority_Specific_Policy = 'R'
- or else Time_Slice_Val > 0)
+ 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
- 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);
Set_OS_Priority (T, Prio);
if Locking_Policy = 'C' then
- -- Annex D requirements: loss of inheritance puts task at the
- -- beginning of the queue for that prio; copied from 5ztaprop
- -- (VxWorks)
+
+ -- 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
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;
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
return;
end if;
- Result := pthread_attr_setdetachstate
- (Attributes'Access, PTHREAD_CREATE_DETACHED);
+ Result :=
+ pthread_attr_setdetachstate
+ (Attributes'Access, PTHREAD_CREATE_DETACHED);
pragma Assert (Result = 0);
- Result := pthread_attr_setstacksize
- (Attributes'Access, Adjusted_Stack_Size);
+ 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));
+ Result :=
+ pthread_attr_setscope
+ (Attributes'Access, Task_Info_Type'Pos (T.Common.Task_Info));
pragma Assert (Result = 0);
end if;
-- 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));
+ 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);
- Set_Priority (T, Priority);
+ if Succeeded then
+ Set_Priority (T, Priority);
+ end if;
end Create_Task;
------------------
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);
begin
if not Single_Lock then
Result := st_setspecific (ATCB_Key, System.Null_Address);
pragma Assert (Result = 0);
end if;
-
end Finalize_TCB;
---------------
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));
+ Result :=
+ pthread_kill
+ (T.Common.LL.Thread,
+ Signal (System.Interrupt_Management.Abort_Task_Interrupt));
pragma Assert (Result = 0);
end Abort_Task;
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 (RM 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, just leave state set 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
- -- is set to False (ARM D.10 par. 9).
+ -- is set to False (RM D.10(9)).
if S.State then
S.State := False;
-- Check_Exit --
----------------
- -- Dummy versions
+ -- Dummy version
function Check_Exit (Self_ID : ST.Task_Id) return Boolean is
pragma Unreferenced (Self_ID);
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 --
----------------
-- Install the abort-signal handler
- if State (System.Interrupt_Management.Abort_Task_Interrupt)
- /= Default
+ if State
+ (System.Interrupt_Management.Abort_Task_Interrupt) /= Default
then
act.sa_flags := 0;
act.sa_handler := Abort_Handler'Address;
Result :=
sigaction
- (Signal (System.Interrupt_Management.Abort_Task_Interrupt),
- act'Unchecked_Access,
- old_act'Unchecked_Access);
+ (Signal (System.Interrupt_Management.Abort_Task_Interrupt),
+ act'Unchecked_Access,
+ old_act'Unchecked_Access);
pragma Assert (Result = 0);
end if;
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