pragma Polling (Off);
with System.Tasking.Debug;
with Interfaces.C;
with System.Interrupt_Management;
with System.Interrupt_Management.Operations;
pragma Elaborate_All (System.Interrupt_Management.Operations);
with System.Parameters;
with System.Tasking;
with Ada.Exceptions;
with System.Soft_Links;
with System.OS_Primitives;
with System.Soft_Links;
with Unchecked_Conversion;
with Unchecked_Deallocation;
package body System.Task_Primitives.Operations is
use System.Tasking.Debug;
use System.Tasking;
use Interfaces.C;
use System.OS_Interface;
use System.Parameters;
use System.OS_Primitives;
package SSL renames System.Soft_Links;
Max_Stack_Size : constant := 2000 * 1024;
Single_RTS_Lock : aliased RTS_Lock;
Environment_Task_ID : Task_ID;
Unblocked_Signal_Mask : aliased sigset_t;
Priority_Ceiling_Emulation : constant Boolean := True;
Next_Serial_Number : Task_Serial_Number := 100;
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");
FIFO_Within_Priorities : constant Boolean := Dispatching_Policy = 'F';
Mutex_Attr : aliased pthread_mutexattr_t;
Cond_Attr : aliased pthread_condattr_t;
subtype unsigned_short is Interfaces.C.unsigned_short;
subtype unsigned_long is Interfaces.C.unsigned_long;
procedure Abort_Handler
(signo : Signal;
gs : unsigned_short;
fs : unsigned_short;
es : unsigned_short;
ds : unsigned_short;
edi : unsigned_long;
esi : unsigned_long;
ebp : unsigned_long;
esp : unsigned_long;
ebx : unsigned_long;
edx : unsigned_long;
ecx : unsigned_long;
eax : unsigned_long;
trapno : unsigned_long;
err : unsigned_long;
eip : unsigned_long;
cs : unsigned_short;
eflags : unsigned_long;
esp_at_signal : unsigned_long;
ss : unsigned_short;
fpstate : System.Address;
oldmask : unsigned_long;
cr2 : unsigned_long);
function To_Task_ID is new Unchecked_Conversion (System.Address, Task_ID);
function To_Address is new Unchecked_Conversion (Task_ID, System.Address);
function To_pthread_t is new Unchecked_Conversion
(Integer, System.OS_Interface.pthread_t);
package Specific is
procedure Initialize (Environment_Task : Task_ID);
pragma Inline (Initialize);
procedure Set (Self_Id : Task_ID);
pragma Inline (Set);
function Self return Task_ID;
pragma Inline (Self);
end Specific;
package body Specific is separate;
procedure Abort_Handler
(signo : Signal;
gs : unsigned_short;
fs : unsigned_short;
es : unsigned_short;
ds : unsigned_short;
edi : unsigned_long;
esi : unsigned_long;
ebp : unsigned_long;
esp : unsigned_long;
ebx : unsigned_long;
edx : unsigned_long;
ecx : unsigned_long;
eax : unsigned_long;
trapno : unsigned_long;
err : unsigned_long;
eip : unsigned_long;
cs : unsigned_short;
eflags : unsigned_long;
esp_at_signal : unsigned_long;
ss : unsigned_short;
fpstate : System.Address;
oldmask : unsigned_long;
cr2 : unsigned_long)
is
Self_Id : Task_ID := Self;
Result : Interfaces.C.int;
Old_Set : aliased sigset_t;
function To_Machine_State_Ptr is new
Unchecked_Conversion (Address, Machine_State_Ptr);
procedure Raise_From_Signal_Handler
(E : Ada.Exceptions.Exception_Id;
M : System.Address);
pragma Import
(Ada, Raise_From_Signal_Handler,
"ada__exceptions__raise_from_signal_handler");
pragma No_Return (Raise_From_Signal_Handler);
mstate : Machine_State_Ptr;
message : aliased constant String := "" & ASCII.Nul;
begin
if Self_Id.Deferral_Level = 0
and then Self_Id.Pending_ATC_Level < Self_Id.ATC_Nesting_Level
and then not Self_Id.Aborting
then
Self_Id.Aborting := True;
Result := pthread_sigmask (SIG_UNBLOCK,
Unblocked_Signal_Mask'Unchecked_Access, Old_Set'Unchecked_Access);
pragma Assert (Result = 0);
mstate := To_Machine_State_Ptr (SSL.Get_Machine_State_Addr.all);
mstate.eip := eip;
mstate.ebx := ebx;
mstate.esp := esp_at_signal;
mstate.ebp := ebp;
mstate.esi := esi;
mstate.edi := edi;
Raise_From_Signal_Handler
(Standard'Abort_Signal'Identity, message'Address);
end if;
end Abort_Handler;
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 Stack_Guard (T : ST.Task_ID; On : Boolean) is
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
Result : Interfaces.C.int;
begin
if Priority_Ceiling_Emulation then
L.Ceiling := Prio;
end if;
Result := pthread_mutex_init (L.L'Access, Mutex_Attr'Access);
pragma Assert (Result = 0 or else Result = ENOMEM);
if Result = ENOMEM then
Ada.Exceptions.Raise_Exception (Storage_Error'Identity,
"Failed to allocate a lock");
end if;
end Initialize_Lock;
procedure Initialize_Lock (L : access RTS_Lock; Level : Lock_Level) is
Result : Interfaces.C.int;
begin
Result := pthread_mutex_init (L, Mutex_Attr'Access);
pragma Assert (Result = 0 or else Result = ENOMEM);
if Result = ENOMEM then
raise Storage_Error;
end if;
end Initialize_Lock;
procedure Finalize_Lock (L : access Lock) is
Result : Interfaces.C.int;
begin
Result := pthread_mutex_destroy (L.L'Access);
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
if Priority_Ceiling_Emulation then
declare
Self_ID : constant Task_ID := Self;
begin
if Self_ID.Common.LL.Active_Priority > L.Ceiling then
Ceiling_Violation := True;
return;
end if;
L.Saved_Priority := Self_ID.Common.LL.Active_Priority;
if Self_ID.Common.LL.Active_Priority < L.Ceiling then
Self_ID.Common.LL.Active_Priority := L.Ceiling;
end if;
Result := pthread_mutex_lock (L.L'Access);
pragma Assert (Result = 0);
Ceiling_Violation := False;
end;
else
Result := pthread_mutex_lock (L.L'Access);
Ceiling_Violation := Result = EINVAL;
pragma Assert (Result = 0 or else Result = EINVAL);
end if;
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
if Priority_Ceiling_Emulation then
declare
Self_ID : constant Task_ID := Self;
begin
Result := pthread_mutex_unlock (L.L'Access);
pragma Assert (Result = 0);
if Self_ID.Common.LL.Active_Priority > L.Saved_Priority then
Self_ID.Common.LL.Active_Priority := L.Saved_Priority;
end if;
end;
else
Result := pthread_mutex_unlock (L.L'Access);
pragma Assert (Result = 0);
end if;
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 : Task_ID;
Reason : System.Tasking.Task_States)
is
Result : Interfaces.C.int;
begin
pragma Assert (Self_ID = Self);
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 : System.Tasking.Task_States;
Timedout : out Boolean;
Yielded : out Boolean)
is
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 Result = EINTR then
Timedout := False;
exit;
end if;
pragma Assert (Result = ETIMEDOUT);
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;
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;
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;
Result := sched_yield;
SSL.Abort_Undefer.all;
end Timed_Delay;
function Monotonic_Clock return Duration is
TV : aliased struct_timeval;
Result : Interfaces.C.int;
begin
Result := gettimeofday (TV'Access, System.Null_Address);
pragma Assert (Result = 0);
return To_Duration (TV);
end Monotonic_Clock;
function RT_Resolution return Duration is
begin
return 10#1.0#E-6;
end RT_Resolution;
procedure Wakeup (T : Task_ID; Reason : System.Tasking.Task_States) is
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;
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
Result : Interfaces.C.int;
Param : aliased struct_sched_param;
begin
T.Common.Current_Priority := Prio;
if Priority_Ceiling_Emulation then
if T.Common.LL.Active_Priority < Prio then
T.Common.LL.Active_Priority := Prio;
end if;
end if;
Param.sched_priority := Interfaces.C.int (Prio) + 1;
if Time_Slice_Val > 0 then
Result := pthread_setschedparam
(T.Common.LL.Thread, SCHED_RR, Param'Access);
elsif FIFO_Within_Priorities or else Time_Slice_Val = 0 then
Result := pthread_setschedparam
(T.Common.LL.Thread, SCHED_FIFO, Param'Access);
else
Result := pthread_setschedparam
(T.Common.LL.Thread, SCHED_OTHER, Param'Access);
end if;
pragma Assert (Result = 0 or else Result = EPERM);
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
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;
function New_ATCB (Entry_Num : Task_Entry_Index) return Task_ID is
begin
return new Ada_Task_Control_Block (Entry_Num);
end New_ATCB;
procedure Initialize_TCB (Self_ID : Task_ID; Succeeded : out Boolean) is
Result : Interfaces.C.int;
begin
Self_ID.Serial_Number := Next_Serial_Number;
Next_Serial_Number := Next_Serial_Number + 1;
pragma Assert (Next_Serial_Number /= 0);
Self_ID.Common.LL.Thread := To_pthread_t (-1);
if not Single_Lock then
Result := pthread_mutex_init (Self_ID.Common.LL.L'Access,
Mutex_Attr'Access);
pragma Assert (Result = 0 or else Result = ENOMEM);
if Result /= 0 then
Succeeded := False;
return;
end if;
end if;
Result := pthread_cond_init (Self_ID.Common.LL.CV'Access,
Cond_Attr'Access);
pragma Assert (Result = 0 or else Result = ENOMEM);
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;
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
Attributes : aliased pthread_attr_t;
Result : Interfaces.C.int;
function Thread_Body_Access is new
Unchecked_Conversion (System.Address, Thread_Body);
begin
Result := pthread_attr_init (Attributes'Access);
pragma Assert (Result = 0 or else Result = ENOMEM);
if Result /= 0 or else Stack_Size > Max_Stack_Size then
Succeeded := False;
return;
end if;
Result := pthread_attr_setdetachstate
(Attributes'Access, PTHREAD_CREATE_DETACHED);
pragma Assert (Result = 0);
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);
end Create_Task;
procedure Finalize_TCB (T : Task_ID) is
Result : Interfaces.C.int;
Tmp : Task_ID := T;
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);
end Finalize_TCB;
procedure Exit_Task is
begin
pthread_exit (System.Null_Address);
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
begin
return True;
end Check_Exit;
function Check_No_Locks (Self_ID : ST.Task_ID) return Boolean is
begin
return True;
end Check_No_Locks;
function Environment_Task return Task_ID is
begin
return Environment_Task_ID;
end Environment_Task;
function Suspend_Task
(T : ST.Task_ID;
Thread_Self : Thread_Id) return Boolean is
begin
if T.Common.LL.Thread /= Thread_Self then
return pthread_kill (T.Common.LL.Thread, SIGSTOP) = 0;
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 pthread_kill (T.Common.LL.Thread, SIGCONT) = 0;
else
return True;
end if;
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;
begin
Environment_Task_ID := Environment_Task;
Result := pthread_mutexattr_init (Mutex_Attr'Access);
pragma Assert (Result = 0 or else Result = ENOMEM);
Result := pthread_condattr_init (Cond_Attr'Access);
pragma Assert (Result = 0 or else Result = ENOMEM);
Initialize_Lock (Single_RTS_Lock'Access, RTS_Lock_Level);
Specific.Initialize (Environment_Task);
Enter_Task (Environment_Task);
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 (Interrupt_Management.Abort_Task_Interrupt),
act'Unchecked_Access,
old_act'Unchecked_Access);
pragma Assert (Result = 0);
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;