-- --
-- B o d y --
-- --
--- Copyright (C) 1992-2006, Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2007, 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- --
-- For example when using the restricted run time, it is replaced by
-- System.Tasking.Restricted.Stages.
-with Unchecked_Conversion;
-with Unchecked_Deallocation;
+with Ada.Unchecked_Conversion;
+with Ada.Unchecked_Deallocation;
package body System.Task_Primitives.Operations is
-- Local Subprograms --
-----------------------
- function To_Address is new Unchecked_Conversion (Task_Id, System.Address);
+ function To_Address is
+ new Ada.Unchecked_Conversion (Task_Id, System.Address);
procedure Abort_Handler (Sig : Signal);
-- Signal handler used to implement asynchronous abort
-- 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 rasing Storage_Error in the following
+ -- routines should be able to be handled safely.
procedure Initialize_Lock
(Prio : System.Any_Priority;
end if;
if Locking_Policy = 'C' then
- Result := pthread_mutexattr_setprotocol
- (Attributes'Access, PTHREAD_PRIO_PROTECT);
+ Result :=
+ pthread_mutexattr_setprotocol
+ (Attributes'Access, PTHREAD_PRIO_PROTECT);
pragma Assert (Result = 0);
- Result := pthread_mutexattr_setprioceiling
- (Attributes'Access, Interfaces.C.int (Prio));
+ Result :=
+ pthread_mutexattr_setprioceiling
+ (Attributes'Access, Interfaces.C.int (Prio));
pragma Assert (Result = 0);
end if;
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);
(L : not null access Lock; Ceiling_Violation : out Boolean)
is
Result : Interfaces.C.int;
+
begin
Result := pthread_mutex_lock (L);
Ceiling_Violation := Result = EINVAL;
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
if not Single_Lock or else Global_Lock then
Result := pthread_mutex_unlock (L);
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);
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 --
-----------
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);
+ 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;
Abs_Time : Duration;
Request : aliased timespec;
Result : Interfaces.C.int;
Request := To_Timespec (Abs_Time);
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 else errno = EINTR then
Timedout := False;
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;
Request : aliased timespec;
Result : Interfaces.C.int;
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;
- Result := pthread_cond_timedwait (Self_ID.Common.LL.CV'Access,
- Self_ID.Common.LL.L'Access, Request'Access);
- exit when Abs_Time <= Monotonic_Clock;
+ 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
use type System.Task_Info.Task_Info_Type;
- function To_Int is new Unchecked_Conversion
+ function To_Int is new Ada.Unchecked_Conversion
(System.Task_Info.Thread_Scheduling_Policy, Interfaces.C.int);
function Get_Policy (Prio : System.Any_Priority) return Character;
procedure Enter_Task (Self_ID : Task_Id) is
Result : Interfaces.C.int;
- function To_Int is new Unchecked_Conversion
+ function To_Int is new Ada.Unchecked_Conversion
(System.Task_Info.CPU_Number, Interfaces.C.int);
use System.Task_Info;
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);
-
- function To_Int is new Unchecked_Conversion
+ Ada.Unchecked_Conversion (System.Address, Thread_Body);
+ function To_Int is new Ada.Unchecked_Conversion
(System.Task_Info.Thread_Scheduling_Scope, Interfaces.C.int);
- function To_Int is new Unchecked_Conversion
+ function To_Int is new Ada.Unchecked_Conversion
(System.Task_Info.Thread_Scheduling_Inheritance, Interfaces.C.int);
- function To_Int is new Unchecked_Conversion
+ function To_Int is new Ada.Unchecked_Conversion
(System.Task_Info.Thread_Scheduling_Policy, Interfaces.C.int);
begin
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, Interfaces.C.size_t (Stack_Size));
+ Result :=
+ pthread_attr_setstacksize
+ (Attributes'Access, Interfaces.C.size_t (Stack_Size));
pragma Assert (Result = 0);
if T.Common.Task_Info /= null then
- Result := pthread_attr_setscope
- (Attributes'Access, To_Int (T.Common.Task_Info.Scope));
+ Result :=
+ pthread_attr_setscope
+ (Attributes'Access, To_Int (T.Common.Task_Info.Scope));
pragma Assert (Result = 0);
- Result := pthread_attr_setinheritsched
- (Attributes'Access, To_Int (T.Common.Task_Info.Inheritance));
+ Result :=
+ pthread_attr_setinheritsched
+ (Attributes'Access, To_Int (T.Common.Task_Info.Inheritance));
pragma Assert (Result = 0);
- Result := pthread_attr_setschedpolicy
- (Attributes'Access, To_Int (T.Common.Task_Info.Policy));
+ Result :=
+ pthread_attr_setschedpolicy
+ (Attributes'Access, To_Int (T.Common.Task_Info.Policy));
pragma Assert (Result = 0);
Sched_Param.sched_priority :=
Interfaces.C.int (T.Common.Task_Info.Priority);
- Result := pthread_attr_setschedparam
- (Attributes'Access, Sched_Param'Access);
+ Result :=
+ pthread_attr_setschedparam
+ (Attributes'Access, Sched_Param'Access);
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));
if Result /= 0
and then T.Common.Task_Info /= null
and then T.Common.Task_Info.Scope = PTHREAD_SCOPE_SYSTEM
then
- -- The pthread_create call may have failed because we
- -- asked for a system scope pthread and none were
- -- available (probably because the program was not executed
- -- by the superuser). Let's try for a process scope pthread
- -- instead of raising Tasking_Error.
+ -- The pthread_create call may have failed because we asked for a
+ -- system scope pthread and none were available (probably because
+ -- the program was not executed by the superuser). Let's try for
+ -- a process scope pthread instead of raising Tasking_Error.
System.IO.Put_Line
("Request for PTHREAD_SCOPE_SYSTEM in Task_Info pragma for task");
System.IO.Put_Line ("Scope changed to PTHREAD_SCOPE_PROCESS");
T.Common.Task_Info.Scope := PTHREAD_SCOPE_PROCESS;
- Result := pthread_attr_setscope
- (Attributes'Access, To_Int (T.Common.Task_Info.Scope));
+ Result :=
+ pthread_attr_setscope
+ (Attributes'Access, To_Int (T.Common.Task_Info.Scope));
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));
end if;
pragma Assert (Result = 0 or else Result = EAGAIN);
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
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;
Mutex_Attr : aliased pthread_mutexattr_t;
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 (RM D.10(6))
S.State := False;
S.Waiting := False;
if Result = ENOMEM then
Result := pthread_condattr_destroy (Cond_Attr'Access);
pragma Assert (Result = 0);
-
raise Storage_Error;
end if;
end if;
--------------
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;
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);
-- 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;
act.sa_mask := Tmp_Set;
Result :=
- sigaction (
- Signal (System.Interrupt_Management.Abort_Task_Interrupt),
- act'Unchecked_Access,
- old_act'Unchecked_Access);
+ sigaction
+ (Signal (System.Interrupt_Management.Abort_Task_Interrupt),
+ act'Unchecked_Access,
+ old_act'Unchecked_Access);
pragma Assert (Result = 0);
end if;
end Initialize;
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