s-taprop-mingw.adb [plain text]
pragma Polling (Off);
with System.Tasking.Debug;
with System.OS_Primitives;
with Interfaces.C;
with Interfaces.C.Strings;
with System.Task_Info;
with System.Interrupt_Management;
with System.Soft_Links;
with Unchecked_Deallocation;
package body System.Task_Primitives.Operations is
package SSL renames System.Soft_Links;
use System.Tasking.Debug;
use System.Tasking;
use Interfaces.C;
use Interfaces.C.Strings;
use System.OS_Interface;
use System.Parameters;
use System.OS_Primitives;
pragma Link_With ("-Xlinker --stack=0x200000,0x1000");
Environment_Task_Id : Task_Id;
Single_RTS_Lock : aliased RTS_Lock;
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;
TlsIndex : DWORD;
pragma Export (Ada, TlsIndex);
package Specific is
function Is_Valid_Task return Boolean;
pragma Inline (Is_Valid_Task);
procedure Set (Self_Id : Task_Id);
pragma Inline (Set);
end Specific;
package body Specific is
function Is_Valid_Task return Boolean is
begin
return TlsGetValue (TlsIndex) /= System.Null_Address;
end Is_Valid_Task;
procedure Set (Self_Id : Task_Id) is
Succeeded : BOOL;
begin
Succeeded := TlsSetValue (TlsIndex, To_Address (Self_Id));
pragma Assert (Succeeded = True);
end Set;
end Specific;
function Register_Foreign_Thread (Thread : Thread_Id) return Task_Id;
function Register_Foreign_Thread
(Thread : Thread_Id) return Task_Id is separate;
procedure Initialize_Cond (Cond : access Condition_Variable);
procedure Finalize_Cond (Cond : access Condition_Variable);
procedure Cond_Signal (Cond : access Condition_Variable);
procedure Cond_Wait
(Cond : access Condition_Variable;
L : access RTS_Lock);
procedure Cond_Timed_Wait
(Cond : access Condition_Variable;
L : access RTS_Lock;
Rel_Time : Duration;
Timed_Out : out Boolean;
Status : out Integer);
procedure Initialize_Cond (Cond : access Condition_Variable) is
hEvent : HANDLE;
begin
hEvent := CreateEvent (null, True, False, Null_Ptr);
pragma Assert (hEvent /= 0);
Cond.all := Condition_Variable (hEvent);
end Initialize_Cond;
procedure Finalize_Cond (Cond : access Condition_Variable) is
Result : BOOL;
begin
Result := CloseHandle (HANDLE (Cond.all));
pragma Assert (Result = True);
end Finalize_Cond;
procedure Cond_Signal (Cond : access Condition_Variable) is
Result : BOOL;
begin
Result := SetEvent (HANDLE (Cond.all));
pragma Assert (Result = True);
end Cond_Signal;
procedure Cond_Wait
(Cond : access Condition_Variable;
L : access RTS_Lock)
is
Result : DWORD;
Result_Bool : BOOL;
begin
Result_Bool := ResetEvent (HANDLE (Cond.all));
pragma Assert (Result_Bool = True);
Unlock (L);
Result := WaitForSingleObject (HANDLE (Cond.all), Wait_Infinite);
pragma Assert (Result = 0);
Write_Lock (L);
end Cond_Wait;
procedure Cond_Timed_Wait
(Cond : access Condition_Variable;
L : access RTS_Lock;
Rel_Time : Duration;
Timed_Out : out Boolean;
Status : out Integer)
is
Time_Out_Max : constant DWORD := 16#FFFF0000#;
Time_Out : DWORD;
Result : BOOL;
Wait_Result : DWORD;
begin
Result := ResetEvent (HANDLE (Cond.all));
pragma Assert (Result = True);
Unlock (L);
if Rel_Time <= 0.0 then
Timed_Out := True;
Wait_Result := 0;
else
if Rel_Time >= Duration (Time_Out_Max) / 1000 then
Time_Out := Time_Out_Max;
else
Time_Out := DWORD (Rel_Time * 1000);
end if;
Wait_Result := WaitForSingleObject (HANDLE (Cond.all), Time_Out);
if Wait_Result = WAIT_TIMEOUT then
Timed_Out := True;
Wait_Result := 0;
else
Timed_Out := False;
end if;
end if;
Write_Lock (L);
if Timed_Out then
Result := SetEvent (HANDLE (Cond.all));
pragma Assert (Result = True);
end if;
Status := Integer (Wait_Result);
end Cond_Timed_Wait;
procedure Stack_Guard (T : ST.Task_Id; On : Boolean) is
pragma Warnings (Off, T);
pragma Warnings (Off, On);
begin
null;
end Stack_Guard;
function Get_Thread_Id (T : ST.Task_Id) return OSI.Thread_Id is
begin
return T.Common.LL.Thread;
end Get_Thread_Id;
function Self return Task_Id is
Self_Id : constant Task_Id := To_Task_Id (TlsGetValue (TlsIndex));
begin
if Self_Id = null then
return Register_Foreign_Thread (GetCurrentThread);
else
return Self_Id;
end if;
end Self;
procedure Initialize_Lock
(Prio : System.Any_Priority;
L : access Lock)
is
begin
InitializeCriticalSection (L.Mutex'Access);
L.Owner_Priority := 0;
L.Priority := Prio;
end Initialize_Lock;
procedure Initialize_Lock (L : access RTS_Lock; Level : Lock_Level) is
pragma Unreferenced (Level);
begin
InitializeCriticalSection (CRITICAL_SECTION (L.all)'Unrestricted_Access);
end Initialize_Lock;
procedure Finalize_Lock (L : access Lock) is
begin
DeleteCriticalSection (L.Mutex'Access);
end Finalize_Lock;
procedure Finalize_Lock (L : access RTS_Lock) is
begin
DeleteCriticalSection (CRITICAL_SECTION (L.all)'Unrestricted_Access);
end Finalize_Lock;
procedure Write_Lock (L : access Lock; Ceiling_Violation : out Boolean) is
begin
L.Owner_Priority := Get_Priority (Self);
if L.Priority < L.Owner_Priority then
Ceiling_Violation := True;
return;
end if;
EnterCriticalSection (L.Mutex'Access);
Ceiling_Violation := False;
end Write_Lock;
procedure Write_Lock
(L : access RTS_Lock;
Global_Lock : Boolean := False)
is
begin
if not Single_Lock or else Global_Lock then
EnterCriticalSection (CRITICAL_SECTION (L.all)'Unrestricted_Access);
end if;
end Write_Lock;
procedure Write_Lock (T : Task_Id) is
begin
if not Single_Lock then
EnterCriticalSection
(CRITICAL_SECTION (T.Common.LL.L)'Unrestricted_Access);
end if;
end Write_Lock;
procedure Read_Lock (L : access Lock; Ceiling_Violation : out Boolean) is
begin
Write_Lock (L, Ceiling_Violation);
end Read_Lock;
procedure Unlock (L : access Lock) is
begin
LeaveCriticalSection (L.Mutex'Access);
end Unlock;
procedure Unlock (L : access RTS_Lock; Global_Lock : Boolean := False) is
begin
if not Single_Lock or else Global_Lock then
LeaveCriticalSection (CRITICAL_SECTION (L.all)'Unrestricted_Access);
end if;
end Unlock;
procedure Unlock (T : Task_Id) is
begin
if not Single_Lock then
LeaveCriticalSection
(CRITICAL_SECTION (T.Common.LL.L)'Unrestricted_Access);
end if;
end Unlock;
procedure Sleep
(Self_ID : Task_Id;
Reason : System.Tasking.Task_States)
is
pragma Unreferenced (Reason);
begin
pragma Assert (Self_ID = Self);
if Single_Lock then
Cond_Wait (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access);
else
Cond_Wait (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access);
end if;
if Self_ID.Deferral_Level = 0
and then Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level
then
Unlock (Self_ID);
raise Standard'Abort_Signal;
end if;
end Sleep;
procedure Timed_Sleep
(Self_ID : Task_Id;
Time : Duration;
Mode : ST.Delay_Modes;
Reason : System.Tasking.Task_States;
Timedout : out Boolean;
Yielded : out Boolean)
is
pragma Unreferenced (Reason);
Check_Time : Duration := Monotonic_Clock;
Rel_Time : Duration;
Abs_Time : Duration;
Result : Integer;
Local_Timedout : Boolean;
begin
Timedout := True;
Yielded := False;
if Mode = Relative then
Rel_Time := Time;
Abs_Time := Duration'Min (Time, Max_Sensible_Delay) + Check_Time;
else
Rel_Time := Time - Check_Time;
Abs_Time := Time;
end if;
if Rel_Time > 0.0 then
loop
exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level
or else Self_ID.Pending_Priority_Change;
if Single_Lock then
Cond_Timed_Wait (Self_ID.Common.LL.CV'Access,
Single_RTS_Lock'Access, Rel_Time, Local_Timedout, Result);
else
Cond_Timed_Wait (Self_ID.Common.LL.CV'Access,
Self_ID.Common.LL.L'Access, Rel_Time, Local_Timedout, Result);
end if;
Check_Time := Monotonic_Clock;
exit when Abs_Time <= Check_Time;
if not Local_Timedout then
Timedout := False;
exit;
end if;
Rel_Time := Abs_Time - Check_Time;
end loop;
end if;
end Timed_Sleep;
procedure Timed_Delay
(Self_ID : Task_Id;
Time : Duration;
Mode : ST.Delay_Modes)
is
Check_Time : Duration := Monotonic_Clock;
Rel_Time : Duration;
Abs_Time : Duration;
Result : Integer;
Timedout : Boolean;
begin
if Single_Lock then
Lock_RTS;
end if;
Write_Lock (Self_ID);
if Mode = Relative then
Rel_Time := Time;
Abs_Time := Time + Check_Time;
else
Rel_Time := Time - Check_Time;
Abs_Time := Time;
end if;
if Rel_Time > 0.0 then
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
Cond_Timed_Wait (Self_ID.Common.LL.CV'Access,
Single_RTS_Lock'Access, Rel_Time, Timedout, Result);
else
Cond_Timed_Wait (Self_ID.Common.LL.CV'Access,
Self_ID.Common.LL.L'Access, Rel_Time, Timedout, Result);
end if;
Check_Time := Monotonic_Clock;
exit when Abs_Time <= Check_Time;
Rel_Time := Abs_Time - Check_Time;
end loop;
Self_ID.Common.State := Runnable;
end if;
Unlock (Self_ID);
if Single_Lock then
Unlock_RTS;
end if;
Yield;
end Timed_Delay;
procedure Wakeup (T : Task_Id; Reason : System.Tasking.Task_States) is
pragma Unreferenced (Reason);
begin
Cond_Signal (T.Common.LL.CV'Access);
end Wakeup;
procedure Yield (Do_Yield : Boolean := True) is
begin
if Do_Yield then
Sleep (0);
end if;
end Yield;
type Prio_Array_Type is array (System.Any_Priority) of Integer;
pragma Atomic_Components (Prio_Array_Type);
Prio_Array : Prio_Array_Type;
procedure Set_Priority
(T : Task_Id;
Prio : System.Any_Priority;
Loss_Of_Inheritance : Boolean := False)
is
Res : BOOL;
Array_Item : Integer;
begin
Res := SetThreadPriority
(T.Common.LL.Thread, Interfaces.C.int (Underlying_Priorities (Prio)));
pragma Assert (Res = True);
if Dispatching_Policy = 'F' then
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;
function Get_Priority (T : Task_Id) return System.Any_Priority is
begin
return T.Common.Current_Priority;
end Get_Priority;
procedure Enter_Task (Self_ID : Task_Id) is
procedure Init_Float;
pragma Import (C, Init_Float, "__gnat_init_float");
begin
Specific.Set (Self_ID);
Init_Float;
Self_ID.Common.LL.Thread_Id := GetCurrentThreadId;
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;
function New_ATCB (Entry_Num : Task_Entry_Index) return Task_Id is
begin
return new Ada_Task_Control_Block (Entry_Num);
end New_ATCB;
function Is_Valid_Task return Boolean renames Specific.Is_Valid_Task;
function Register_Foreign_Thread return Task_Id is
begin
if Is_Valid_Task then
return Self;
else
return Register_Foreign_Thread (GetCurrentThread);
end if;
end Register_Foreign_Thread;
procedure Initialize_TCB (Self_ID : Task_Id; Succeeded : out Boolean) is
begin
Self_ID.Common.LL.Thread := 0;
Initialize_Cond (Self_ID.Common.LL.CV'Access);
if not Single_Lock then
Initialize_Lock (Self_ID.Common.LL.L'Access, ATCB_Level);
end if;
Succeeded := True;
end Initialize_TCB;
procedure Create_Task
(T : Task_Id;
Wrapper : System.Address;
Stack_Size : System.Parameters.Size_Type;
Priority : System.Any_Priority;
Succeeded : out Boolean)
is
Initial_Stack_Size : constant := 1024;
function Is_Windows_XP return Integer;
pragma Import (C, Is_Windows_XP, "__gnat_is_windows_xp");
hTask : HANDLE;
TaskId : aliased DWORD;
pTaskParameter : System.OS_Interface.PVOID;
Result : DWORD;
Entry_Point : PTHREAD_START_ROUTINE;
begin
pTaskParameter := To_Address (T);
Entry_Point := To_PTHREAD_START_ROUTINE (Wrapper);
if Is_Windows_XP = 1 then
hTask := CreateThread
(null,
DWORD (Stack_Size),
Entry_Point,
pTaskParameter,
DWORD (Create_Suspended) or
DWORD (Stack_Size_Param_Is_A_Reservation),
TaskId'Unchecked_Access);
else
hTask := CreateThread
(null,
Initial_Stack_Size,
Entry_Point,
pTaskParameter,
DWORD (Create_Suspended),
TaskId'Unchecked_Access);
end if;
if hTask = 0 then
raise Storage_Error;
end if;
T.Common.LL.Thread := hTask;
Set_Priority (T, Priority);
if Time_Slice_Val = 0 or else Dispatching_Policy = 'F' then
SetThreadPriorityBoost (hTask, DisablePriorityBoost => True);
end if;
Result := ResumeThread (hTask);
pragma Assert (Result = 1);
Succeeded := Result = 1;
end Create_Task;
procedure Finalize_TCB (T : Task_Id) is
Self_ID : Task_Id := T;
Result : DWORD;
Succeeded : BOOL;
Is_Self : constant Boolean := T = Self;
procedure Free is new
Unchecked_Deallocation (Ada_Task_Control_Block, Task_Id);
begin
if not Single_Lock then
Finalize_Lock (T.Common.LL.L'Access);
end if;
Finalize_Cond (T.Common.LL.CV'Access);
if T.Known_Tasks_Index /= -1 then
Known_Tasks (T.Known_Tasks_Index) := null;
end if;
if Self_ID.Common.LL.Thread /= 0 then
Result := WaitForSingleObject (T.Common.LL.Thread, Wait_Infinite);
pragma Assert (Result /= WAIT_FAILED);
Succeeded := CloseHandle (T.Common.LL.Thread);
pragma Assert (Succeeded = True);
end if;
Free (Self_ID);
if Is_Self then
Specific.Set (null);
end if;
end Finalize_TCB;
procedure Exit_Task is
begin
Specific.Set (null);
end Exit_Task;
procedure Abort_Task (T : Task_Id) is
pragma Unreferenced (T);
begin
null;
end Abort_Task;
function Environment_Task return Task_Id is
begin
return Environment_Task_Id;
end Environment_Task;
procedure Lock_RTS is
begin
Write_Lock (Single_RTS_Lock'Access, Global_Lock => True);
end Lock_RTS;
procedure Unlock_RTS is
begin
Unlock (Single_RTS_Lock'Access, Global_Lock => True);
end Unlock_RTS;
procedure Initialize (Environment_Task : Task_Id) is
Discard : BOOL;
pragma Unreferenced (Discard);
begin
Environment_Task_Id := Environment_Task;
OS_Primitives.Initialize;
Interrupt_Management.Initialize;
if Time_Slice_Val = 0 or else Dispatching_Policy = 'F' then
Discard :=
OS_Interface.SetPriorityClass
(GetCurrentProcess, High_Priority_Class);
end if;
TlsIndex := TlsAlloc;
Initialize_Lock (Single_RTS_Lock'Access, RTS_Lock_Level);
Environment_Task.Common.LL.Thread := GetCurrentThread;
Enter_Task (Environment_Task);
end Initialize;
function Monotonic_Clock return Duration
renames System.OS_Primitives.Monotonic_Clock;
function RT_Resolution return Duration is
begin
return 0.000_001; end RT_Resolution;
procedure Initialize (S : in out Suspension_Object) is
begin
S.State := False;
S.Waiting := False;
InitializeCriticalSection (S.L'Access);
S.CV := CreateEvent (null, True, False, Null_Ptr);
pragma Assert (S.CV /= 0);
end Initialize;
procedure Finalize (S : in out Suspension_Object) is
Result : BOOL;
begin
DeleteCriticalSection (S.L'Access);
Result := CloseHandle (S.CV);
pragma Assert (Result = True);
end Finalize;
function Current_State (S : Suspension_Object) return Boolean is
begin
return S.State;
end Current_State;
procedure Set_False (S : in out Suspension_Object) is
begin
SSL.Abort_Defer.all;
EnterCriticalSection (S.L'Access);
S.State := False;
LeaveCriticalSection (S.L'Access);
SSL.Abort_Undefer.all;
end Set_False;
procedure Set_True (S : in out Suspension_Object) is
Result : BOOL;
begin
SSL.Abort_Defer.all;
EnterCriticalSection (S.L'Access);
if S.Waiting then
S.Waiting := False;
S.State := False;
Result := SetEvent (S.CV);
pragma Assert (Result = True);
else
S.State := True;
end if;
LeaveCriticalSection (S.L'Access);
SSL.Abort_Undefer.all;
end Set_True;
procedure Suspend_Until_True (S : in out Suspension_Object) is
Result : DWORD;
Result_Bool : BOOL;
begin
SSL.Abort_Defer.all;
EnterCriticalSection (S.L'Access);
if S.Waiting then
LeaveCriticalSection (S.L'Access);
SSL.Abort_Undefer.all;
raise Program_Error;
else
if S.State then
S.State := False;
LeaveCriticalSection (S.L'Access);
SSL.Abort_Undefer.all;
else
S.Waiting := True;
Result_Bool := ResetEvent (S.CV);
pragma Assert (Result_Bool = True);
LeaveCriticalSection (S.L'Access);
SSL.Abort_Undefer.all;
Result := WaitForSingleObject (S.CV, Wait_Infinite);
pragma Assert (Result = 0);
end if;
end if;
end Suspend_Until_True;
function Check_Exit (Self_ID : ST.Task_Id) return Boolean is
pragma Unreferenced (Self_ID);
begin
return True;
end Check_Exit;
function Check_No_Locks (Self_ID : ST.Task_Id) return Boolean is
pragma Unreferenced (Self_ID);
begin
return True;
end Check_No_Locks;
function Suspend_Task
(T : ST.Task_Id;
Thread_Self : Thread_Id) return Boolean
is
begin
if T.Common.LL.Thread /= Thread_Self then
return SuspendThread (T.Common.LL.Thread) = NO_ERROR;
else
return True;
end if;
end Suspend_Task;
function Resume_Task
(T : ST.Task_Id;
Thread_Self : Thread_Id) return Boolean
is
begin
if T.Common.LL.Thread /= Thread_Self then
return ResumeThread (T.Common.LL.Thread) = NO_ERROR;
else
return True;
end if;
end Resume_Task;
end System.Task_Primitives.Operations;