pragma Polling (Off);
with Interfaces.C;
with System.Task_Info;
with System.Tasking.Debug;
with System.IO;
with System.Interrupt_Management;
with System.Interrupt_Management.Operations;
pragma Elaborate_All (System.Interrupt_Management.Operations);
with System.Parameters;
with System.Tasking;
with System.Soft_Links;
with System.Program_Info;
with System.OS_Interface;
with System.OS_Primitives;
with Unchecked_Conversion;
with Unchecked_Deallocation;
package body System.Task_Primitives.Operations is
use System.Tasking;
use System.Tasking.Debug;
use Interfaces.C;
use System.OS_Interface;
use System.OS_Primitives;
use System.Parameters;
package SSL renames System.Soft_Links;
Single_RTS_Lock : aliased RTS_Lock;
ATCB_Key : aliased pthread_key_t;
Environment_Task_Id : Task_Id;
Locking_Policy : Character;
pragma Import (C, Locking_Policy, "__gl_locking_policy");
Real_Time_Clock_Id : constant clockid_t := CLOCK_REALTIME;
Unblocked_Signal_Mask : aliased sigset_t;
Foreign_Task_Elaborated : aliased Boolean := True;
package Specific is
procedure Initialize (Environment_Task : Task_Id);
pragma Inline (Initialize);
function Is_Valid_Task return Boolean;
pragma Inline (Is_Valid_Task);
procedure Set (Self_Id : Task_Id);
pragma Inline (Set);
function Self return Task_Id;
pragma Inline (Self);
end Specific;
package body Specific is separate;
function Register_Foreign_Thread (Thread : Thread_Id) return Task_Id;
function Register_Foreign_Thread
(Thread : Thread_Id) return Task_Id is separate;
function To_Address is new Unchecked_Conversion (Task_Id, System.Address);
procedure Abort_Handler (Sig : Signal);
procedure Abort_Handler (Sig : Signal) is
pragma Unreferenced (Sig);
T : constant Task_Id := Self;
Result : Interfaces.C.int;
Old_Set : aliased sigset_t;
begin
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
then
Result := pthread_sigmask
(SIG_UNBLOCK,
Unblocked_Signal_Mask'Unchecked_Access,
Old_Set'Unchecked_Access);
pragma Assert (Result = 0);
raise Standard'Abort_Signal;
end if;
end Abort_Handler;
procedure Stack_Guard (T : ST.Task_Id; On : Boolean) is
pragma Unreferenced (On);
pragma Unreferenced (T);
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 renames Specific.Self;
procedure Initialize_Lock
(Prio : System.Any_Priority;
L : 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
Result := pthread_mutexattr_setprotocol
(Attributes'Access, PTHREAD_PRIO_PROTECT);
pragma Assert (Result = 0);
Result := pthread_mutexattr_setprioceiling
(Attributes'Access, Interfaces.C.int (Prio));
pragma Assert (Result = 0);
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;
procedure Initialize_Lock (L : 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;
if Locking_Policy = 'C' then
Result := pthread_mutexattr_setprotocol
(Attributes'Access, PTHREAD_PRIO_PROTECT);
pragma Assert (Result = 0);
Result := pthread_mutexattr_setprioceiling
(Attributes'Access, Interfaces.C.int (System.Any_Priority'Last));
pragma Assert (Result = 0);
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);
end Initialize_Lock;
procedure Finalize_Lock (L : access Lock) is
Result : Interfaces.C.int;
begin
Result := pthread_mutex_destroy (L);
pragma Assert (Result = 0);
end Finalize_Lock;
procedure Finalize_Lock (L : access RTS_Lock) is
Result : Interfaces.C.int;
begin
Result := pthread_mutex_destroy (L);
pragma Assert (Result = 0);
end Finalize_Lock;
procedure Write_Lock (L : access Lock; Ceiling_Violation : out Boolean) is
Result : Interfaces.C.int;
begin
Result := pthread_mutex_lock (L);
Ceiling_Violation := Result = EINVAL;
pragma Assert (Result = 0 or else Result = EINVAL);
end Write_Lock;
procedure Write_Lock
(L : 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;
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
Result : Interfaces.C.int;
begin
Result := pthread_mutex_unlock (L);
pragma Assert (Result = 0);
end Unlock;
procedure Unlock (L : 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;
procedure Sleep
(Self_ID : ST.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;
pragma Assert (Result = 0 or else Result = EINTR);
end Sleep;
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);
Check_Time : constant Duration := Monotonic_Clock;
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;
else
Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time);
end if;
if Abs_Time > Check_Time then
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;
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;
exit when Abs_Time <= Monotonic_Clock;
if Result = 0 or else errno = EINTR then
Timedout := False;
exit;
end if;
end loop;
end if;
end Timed_Sleep;
procedure Timed_Delay
(Self_ID : Task_Id;
Time : Duration;
Mode : ST.Delay_Modes)
is
Check_Time : constant Duration := Monotonic_Clock;
Abs_Time : Duration;
Request : aliased timespec;
Result : Interfaces.C.int;
begin
SSL.Abort_Defer.all;
if Single_Lock then
Lock_RTS;
end if;
Write_Lock (Self_ID);
if Mode = Relative then
Abs_Time := Time + Check_Time;
else
Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time);
end if;
if Abs_Time > Check_Time then
Request := To_Timespec (Abs_Time);
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;
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;
Yield;
SSL.Abort_Undefer.all;
end Timed_Delay;
function Monotonic_Clock return Duration is
TS : aliased timespec;
Result : Interfaces.C.int;
begin
Result := clock_gettime (Real_Time_Clock_Id, TS'Unchecked_Access);
pragma Assert (Result = 0);
return To_Duration (TS);
end Monotonic_Clock;
function RT_Resolution return Duration is
begin
return 0.000_001;
end RT_Resolution;
procedure Wakeup (T : ST.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;
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;
procedure Set_Priority
(T : Task_Id;
Prio : System.Any_Priority;
Loss_Of_Inheritance : Boolean := False)
is
pragma Unreferenced (Loss_Of_Inheritance);
Result : Interfaces.C.int;
Param : aliased struct_sched_param;
Sched_Policy : Interfaces.C.int;
use type System.Task_Info.Task_Info_Type;
function To_Int is new Unchecked_Conversion
(System.Task_Info.Thread_Scheduling_Policy, Interfaces.C.int);
begin
T.Common.Current_Priority := Prio;
Param.sched_priority := Interfaces.C.int (Prio);
if T.Common.Task_Info /= null then
Sched_Policy := To_Int (T.Common.Task_Info.Policy);
else
Sched_Policy := SCHED_FIFO;
end if;
Result := pthread_setschedparam (T.Common.LL.Thread, Sched_Policy,
Param'Access);
pragma Assert (Result = 0);
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
Result : Interfaces.C.int;
function To_Int is new Unchecked_Conversion
(System.Task_Info.CPU_Number, Interfaces.C.int);
use System.Task_Info;
begin
Self_ID.Common.LL.Thread := pthread_self;
Specific.Set (Self_ID);
if Self_ID.Common.Task_Info /= null
and then Self_ID.Common.Task_Info.Scope = PTHREAD_SCOPE_SYSTEM
and then Self_ID.Common.Task_Info.Runon_CPU /= ANY_CPU
then
Result := pthread_setrunon_np
(To_Int (Self_ID.Common.Task_Info.Runon_CPU));
pragma Assert (Result = 0);
end if;
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 (pthread_self);
end if;
end Register_Foreign_Thread;
procedure Initialize_TCB (Self_ID : Task_Id; Succeeded : out Boolean) is
Result : Interfaces.C.int;
Cond_Attr : aliased pthread_condattr_t;
begin
if not Single_Lock then
Initialize_Lock (Self_ID.Common.LL.L'Access, ATCB_Level);
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;
procedure Create_Task
(T : Task_Id;
Wrapper : System.Address;
Stack_Size : System.Parameters.Size_Type;
Priority : System.Any_Priority;
Succeeded : out Boolean)
is
use System.Task_Info;
Attributes : aliased pthread_attr_t;
Sched_Param : aliased struct_sched_param;
Adjusted_Stack_Size : Interfaces.C.size_t;
Result : Interfaces.C.int;
function Thread_Body_Access is new
Unchecked_Conversion (System.Address, Thread_Body);
function To_Int is new Unchecked_Conversion
(System.Task_Info.Thread_Scheduling_Scope, Interfaces.C.int);
function To_Int is new Unchecked_Conversion
(System.Task_Info.Thread_Scheduling_Inheritance, Interfaces.C.int);
function To_Int is new Unchecked_Conversion
(System.Task_Info.Thread_Scheduling_Policy, Interfaces.C.int);
begin
if Stack_Size = System.Parameters.Unspecified_Size then
Adjusted_Stack_Size :=
Interfaces.C.size_t (System.Program_Info.Default_Task_Stack);
elsif Stack_Size < Size_Type (Minimum_Stack_Size) then
Adjusted_Stack_Size :=
Interfaces.C.size_t (Minimum_Stack_Size);
else
Adjusted_Stack_Size := Interfaces.C.size_t (Stack_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 /= null then
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));
pragma Assert (Result = 0);
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);
pragma Assert (Result = 0);
end if;
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
System.IO.Put_Line
("Request for PTHREAD_SCOPE_SYSTEM in Task_Info pragma for task");
System.IO.Put ("""");
System.IO.Put (T.Common.Task_Image (1 .. T.Common.Task_Image_Len));
System.IO.Put_Line (""" could not be honored. ");
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));
pragma Assert (Result = 0);
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);
Succeeded := Result = 0;
if T.Common.Task_Info /= null then
T.Common.Base_Priority := T.Common.Task_Info.Priority;
Set_Priority (T, T.Common.Task_Info.Priority);
else
Set_Priority (T, Priority);
end if;
Result := pthread_attr_destroy (Attributes'Access);
pragma Assert (Result = 0);
end Create_Task;
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
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
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
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;
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 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;
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;
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;
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");
Default : constant Character := 's';
begin
Environment_Task_Id := Environment_Task;
Initialize_Lock (Single_RTS_Lock'Access, RTS_Lock_Level);
Specific.Initialize (Environment_Task);
Enter_Task (Environment_Task);
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;
begin
declare
Result : Interfaces.C.int;
begin
System.Interrupt_Management.Operations.Set_Interrupt_Mask
(System.Interrupt_Management.Operations.All_Tasks_Mask'Access);
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;
end;
end System.Task_Primitives.Operations;