pragma Polling (Off);
with Interfaces.C;
with System.Tasking.Debug;
with System.Task_Info;
with System.Interrupt_Management;
with System.Parameters;
with System.Tasking;
with System.Program_Info;
with System.Soft_Links;
with System.OS_Primitives;
with System.Storage_Elements;
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;
Single_RTS_Lock : aliased RTS_Lock;
Environment_Task_ID : Task_ID;
Locking_Policy : Character;
pragma Import (C, Locking_Policy, "__gl_locking_policy");
Clock_Address : constant System.Address :=
System.Storage_Elements.To_Address (16#200F90#);
RT_Clock_Id : clockid_t;
for RT_Clock_Id'Address use Clock_Address;
procedure Initialize_Athread_Library;
function To_Task_ID is new Unchecked_Conversion (System.Address, Task_ID);
function To_Address is new Unchecked_Conversion (Task_ID, System.Address);
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 is
begin
return To_Task_ID (pthread_get_current_ada_tcb);
end 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);
if Result = FUNC_ERR then
raise Storage_Error;
end if;
if Locking_Policy = 'C' then
Result := pthread_mutexattr_setqueueorder
(Attributes'Access, MUTEX_PRIORITY_CEILING);
pragma Assert (Result /= FUNC_ERR);
Result := pthread_mutexattr_setceilingprio
(Attributes'Access, Interfaces.C.int (Prio));
pragma Assert (Result /= FUNC_ERR);
end if;
Result := pthread_mutex_init (L, Attributes'Access);
if Result = FUNC_ERR then
Result := pthread_mutexattr_destroy (Attributes'Access);
raise Storage_Error;
end if;
Result := pthread_mutexattr_destroy (Attributes'Access);
end Initialize_Lock;
procedure Initialize_Lock (L : access RTS_Lock; Level : Lock_Level) is
Attributes : aliased pthread_mutexattr_t;
Result : Interfaces.C.int;
begin
Result := pthread_mutexattr_init (Attributes'Access);
if Result = FUNC_ERR then
raise Storage_Error;
end if;
if Locking_Policy = 'C' then
Result := pthread_mutexattr_setqueueorder
(Attributes'Access, MUTEX_PRIORITY_CEILING);
pragma Assert (Result /= FUNC_ERR);
Result := pthread_mutexattr_setceilingprio
(Attributes'Access, Interfaces.C.int (System.Any_Priority'Last));
pragma Assert (Result /= FUNC_ERR);
end if;
Result := pthread_mutex_init (L, Attributes'Access);
if Result = FUNC_ERR 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 = FUNC_ERR and then errno = EINVAL;
pragma Assert (Result /= FUNC_ERR);
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
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 : System.Tasking.Task_States;
Timedout : out Boolean;
Yielded : out Boolean)
is
Check_Time : constant Duration := Monotonic_Clock;
Abs_Time : Duration;
Request : aliased struct_timeval;
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_Timeval (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
or else (Result = -1 and then errno = EAGAIN));
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 struct_timeval;
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_Timeval (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 = -1 and then errno = EAGAIN) or else
Result = EINTR);
end loop;
Self_ID.Common.State := Runnable;
end if;
Unlock (Self_ID);
if Single_Lock then
Unlock_RTS;
end if;
pthread_yield;
SSL.Abort_Undefer.all;
end Timed_Delay;
function Monotonic_Clock return Duration is
type timeval is record
tv_sec : Integer;
tv_usec : Integer;
end record;
pragma Convention (C, timeval);
tv : aliased timeval;
procedure gettimeofday (tp : access timeval);
pragma Import (C, gettimeofday, "gettimeofday", "gettimeofday");
begin
gettimeofday (tv'Access);
return Duration (tv.tv_sec) + Duration (tv.tv_usec) / 1_000_000.0;
end Monotonic_Clock;
function RT_Resolution return Duration is
begin
return 10#1.0#E-6;
end RT_Resolution;
procedure Wakeup
(T : ST.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
begin
if Do_Yield then
pthread_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;
begin
T.Common.Current_Priority := Prio;
Result := pthread_setprio (T.Common.LL.Thread, Interfaces.C.int (Prio));
pragma Assert (Result /= FUNC_ERR);
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;
begin
Self_ID.Common.LL.Thread := pthread_self;
Self_ID.Common.LL.LWP := sproc_self;
Result :=
pthread_set_ada_tcb (Self_ID.Common.LL.Thread, To_Address (Self_ID));
pragma Assert (Result = 0);
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;
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
Attributes : aliased pthread_attr_t;
Adjusted_Stack_Size : Interfaces.C.size_t;
Result : Interfaces.C.int;
function Thread_Body_Access is new
Unchecked_Conversion (System.Address, start_addr);
function To_Resource_T is new Unchecked_Conversion
(System.Task_Info.Resource_Vector_T, System.OS_Interface.resource_t);
use System.Task_Info;
begin
if Stack_Size = Unspecified_Size then
Adjusted_Stack_Size :=
Interfaces.C.size_t (System.Program_Info.Default_Task_Stack);
elsif Stack_Size < 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, 1);
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_setresources
(Attributes'Access,
To_Resource_T (T.Common.Task_Info.Thread_Resources));
pragma Assert (Result /= FUNC_ERR);
if T.Common.Task_Info.Thread_Timeslice /= 0.0 then
declare
use System.OS_Interface;
Tv : aliased struct_timeval := To_Timeval
(T.Common.Task_Info.Thread_Timeslice);
begin
Result := pthread_attr_set_tslice
(Attributes'Access, Tv'Access);
end;
end if;
if T.Common.Task_Info.Bound_To_Sproc then
Result := pthread_attr_set_boundtosproc
(Attributes'Access, PTHREAD_BOUND);
Result := pthread_attr_set_bsproc
(Attributes'Access, T.Common.Task_Info.Sproc);
end if;
end if;
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;
Set_Priority (T, Priority);
Result := pthread_attr_destroy (Attributes'Access);
pragma Assert (Result /= FUNC_ERR);
end Create_Task;
procedure Finalize_TCB (T : Task_ID) is
procedure Free is new
Unchecked_Deallocation (Ada_Task_Control_Block, Task_ID);
Result : Interfaces.C.int;
Tmp : Task_ID := T;
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,
Interfaces.C.int (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;
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
begin
if T.Common.LL.Thread /= Thread_Self then
return pthread_suspend (T.Common.LL.Thread) = 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_resume (T.Common.LL.Thread) = 0;
else
return True;
end if;
end Resume_Task;
procedure Initialize (Environment_Task : Task_ID) is
begin
Environment_Task_ID := Environment_Task;
Initialize_Lock (Single_RTS_Lock'Access, RTS_Lock_Level);
Enter_Task (Environment_Task);
Set_Priority (Environment_Task,
Environment_Task.Common.Current_Priority);
end Initialize;
procedure Initialize_Athread_Library is
Result : Interfaces.C.int;
Init : aliased pthread_init_struct;
package PINF renames System.Program_Info;
package C renames Interfaces.C;
begin
Init.conf_initsize := C.int (PINF.Pthread_Arena_Size);
Init.max_sproc_count := C.int (PINF.Max_Sproc_Count);
Init.sproc_stack_size := C.size_t (PINF.Sproc_Stack_Size);
Init.os_default_priority := C.int (PINF.Os_Default_Priority);
Init.os_sched_signal := C.int (PINF.Pthread_Sched_Signal);
Init.guard_pages := C.int (PINF.Stack_Guard_Pages);
Init.init_sproc_count := C.int (PINF.Initial_Sproc_Count);
Result := pthread_exec_begin (Init'Access);
pragma Assert (Result /= FUNC_ERR);
if Result = FUNC_ERR then
raise Storage_Error; end if;
end Initialize_Athread_Library;
begin
Initialize_Athread_Library;
end System.Task_Primitives.Operations;