1 ------------------------------------------------------------------------------
3 -- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
5 -- S Y S T E M . T A S K _ P R I M I T I V E S . O P E R A T I O N S --
10 -- Copyright (C) 1992-2002, Free Software Foundation, Inc. --
12 -- GNARL is free software; you can redistribute it and/or modify it under --
13 -- terms of the GNU General Public License as published by the Free Soft- --
14 -- ware Foundation; either version 2, or (at your option) any later ver- --
15 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
16 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
17 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
18 -- for more details. You should have received a copy of the GNU General --
19 -- Public License distributed with GNARL; see file COPYING. If not, write --
20 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
21 -- MA 02111-1307, USA. --
23 -- As a special exception, if other files instantiate generics from this --
24 -- unit, or you link this unit with other files to produce an executable, --
25 -- this unit does not by itself cause the resulting executable to be --
26 -- covered by the GNU General Public License. This exception does not --
27 -- however invalidate any other reasons why the executable file might be --
28 -- covered by the GNU Public License. --
30 -- GNARL was developed by the GNARL team at Florida State University. It is --
31 -- now maintained by Ada Core Technologies, Inc. (http://www.gnat.com). --
33 ------------------------------------------------------------------------------
35 -- This is a NT (native) version of this package.
37 -- This package contains all the GNULL primitives that interface directly
38 -- with the underlying OS.
41 -- Turn off polling, we do not want ATC polling to take place during
42 -- tasking operations. It causes infinite loops and other problems.
44 with System.Tasking.Debug;
45 -- used for Known_Tasks
51 with Interfaces.C.Strings;
54 with System.OS_Interface;
55 -- used for various type, constant, and operations
57 with System.Parameters;
61 -- used for Ada_Task_Control_Block
64 with System.Soft_Links;
65 -- used for Defer/Undefer_Abort
66 -- to initialize TSD for a C thread, in function Self
68 -- Note that we do not use System.Tasking.Initialization directly since
69 -- this is a higher level package that we shouldn't depend on. For example
70 -- when using the restricted run time, it is replaced by
71 -- System.Tasking.Restricted.Initialization
73 with System.OS_Primitives;
74 -- used for Delay_Modes
76 with System.Task_Info;
77 -- used for Unspecified_Task_Info
79 with Unchecked_Conversion;
80 with Unchecked_Deallocation;
82 package body System.Task_Primitives.Operations is
84 use System.Tasking.Debug;
87 use Interfaces.C.Strings;
88 use System.OS_Interface;
89 use System.Parameters;
90 use System.OS_Primitives;
92 pragma Link_With ("-Xlinker --stack=0x800000,0x1000");
93 -- Change the stack size (8 MB) for tasking programs on Windows. This
94 -- permit to have more than 30 tasks running at the same time. Note that
95 -- we set the stack size for non tasking programs on System unit.
97 package SSL renames System.Soft_Links;
103 Environment_Task_ID : Task_ID;
104 -- A variable to hold Task_ID for the environment task.
106 Single_RTS_Lock : aliased RTS_Lock;
107 -- This is a lock to allow only one thread of control in the RTS at
108 -- a time; it is used to execute in mutual exclusion from all other tasks.
109 -- Used mainly in Single_Lock mode, but also to protect All_Tasks_List
111 Time_Slice_Val : Integer;
112 pragma Import (C, Time_Slice_Val, "__gl_time_slice_val");
114 Dispatching_Policy : Character;
115 pragma Import (C, Dispatching_Policy, "__gl_task_dispatching_policy");
117 FIFO_Within_Priorities : constant Boolean := Dispatching_Policy = 'F';
118 -- Indicates whether FIFO_Within_Priorities is set.
120 ---------------------------------
121 -- Foreign Threads Detection --
122 ---------------------------------
124 -- The following are used to allow the Self function to
125 -- automatically generate ATCB's for C threads that happen to call
126 -- Ada procedure, which in turn happen to call the Ada run-time system.
129 type Fake_ATCB_Ptr is access Fake_ATCB;
130 type Fake_ATCB is record
131 Stack_Base : Interfaces.C.unsigned := 0;
132 -- A value of zero indicates the node is not in use.
133 Next : Fake_ATCB_Ptr;
134 Real_ATCB : aliased Ada_Task_Control_Block (0);
137 Fake_ATCB_List : Fake_ATCB_Ptr;
138 -- A linear linked list.
139 -- The list is protected by Single_RTS_Lock;
140 -- Nodes are added to this list from the front.
141 -- Once a node is added to this list, it is never removed.
143 Fake_Task_Elaborated : aliased Boolean := True;
144 -- Used to identified fake tasks (i.e., non-Ada Threads).
146 Next_Fake_ATCB : Fake_ATCB_Ptr;
147 -- Used to allocate one Fake_ATCB in advance. See comment in New_Fake_ATCB
149 ---------------------------------
150 -- Support for New_Fake_ATCB --
151 ---------------------------------
153 function New_Fake_ATCB return Task_ID;
154 -- Allocate and Initialize a new ATCB. This code can safely be called from
155 -- a foreign thread, as it doesn't access implicitly or explicitly
156 -- "self" before having initialized the new ATCB.
158 ------------------------------------
159 -- The thread local storage index --
160 ------------------------------------
163 pragma Export (Ada, TlsIndex);
164 -- To ensure that this variable won't be local to this package, since
165 -- in some cases, inlining forces this variable to be global anyway.
167 ----------------------------------
168 -- Utility Conversion Functions --
169 ----------------------------------
171 function To_Task_Id is new Unchecked_Conversion (System.Address, Task_ID);
173 function To_Address is new Unchecked_Conversion (Task_ID, System.Address);
179 function New_Fake_ATCB return Task_ID is
181 P, Q : Fake_ATCB_Ptr;
186 -- This section is ticklish.
187 -- We dare not call anything that might require an ATCB, until
188 -- we have the new ATCB in place.
195 if P.Stack_Base = 0 then
204 -- Create a new ATCB with zero entries.
206 Self_ID := Next_Fake_ATCB.Real_ATCB'Access;
207 Next_Fake_ATCB.Stack_Base := 1;
208 Next_Fake_ATCB.Next := Fake_ATCB_List;
209 Fake_ATCB_List := Next_Fake_ATCB;
210 Next_Fake_ATCB := null;
213 -- Reuse an existing fake ATCB.
215 Self_ID := Q.Real_ATCB'Access;
219 -- Record this as the Task_ID for the current thread.
221 Self_ID.Common.LL.Thread := GetCurrentThread;
223 Res := TlsSetValue (TlsIndex, To_Address (Self_ID));
224 pragma Assert (Res = True);
226 -- Do the standard initializations
228 System.Tasking.Initialize_ATCB
229 (Self_ID, null, Null_Address, Null_Task, Fake_Task_Elaborated'Access,
230 System.Priority'First, Task_Info.Unspecified_Task_Info, 0, Self_ID,
232 pragma Assert (Succeeded);
234 -- Finally, it is safe to use an allocator in this thread.
236 if Next_Fake_ATCB = null then
237 Next_Fake_ATCB := new Fake_ATCB;
240 Self_ID.Master_of_Task := 0;
241 Self_ID.Master_Within := Self_ID.Master_of_Task + 1;
243 for L in Self_ID.Entry_Calls'Range loop
244 Self_ID.Entry_Calls (L).Self := Self_ID;
245 Self_ID.Entry_Calls (L).Level := L;
248 Self_ID.Common.State := Runnable;
249 Self_ID.Awake_Count := 1;
251 -- Since this is not an ordinary Ada task, we will start out undeferred
253 Self_ID.Deferral_Level := 0;
255 System.Soft_Links.Create_TSD (Self_ID.Common.Compiler_Data);
258 -- The following call is commented out to avoid dependence on
259 -- the System.Tasking.Initialization package.
260 -- It seems that if we want Ada.Task_Attributes to work correctly
261 -- for C threads we will need to raise the visibility of this soft
262 -- link to System.Soft_Links.
263 -- We are putting that off until this new functionality is otherwise
265 -- System.Tasking.Initialization.Initialize_Attributes_Link.all (T);
267 -- Must not unlock until Next_ATCB is again allocated.
273 ----------------------------------
274 -- Condition Variable Functions --
275 ----------------------------------
277 procedure Initialize_Cond (Cond : access Condition_Variable);
278 -- Initialize given condition variable Cond
280 procedure Finalize_Cond (Cond : access Condition_Variable);
281 -- Finalize given condition variable Cond.
283 procedure Cond_Signal (Cond : access Condition_Variable);
284 -- Signal condition variable Cond
287 (Cond : access Condition_Variable;
288 L : access RTS_Lock);
289 -- Wait on conditional variable Cond, using lock L
291 procedure Cond_Timed_Wait
292 (Cond : access Condition_Variable;
295 Timed_Out : out Boolean;
296 Status : out Integer);
297 -- Do timed wait on condition variable Cond using lock L. The duration
298 -- of the timed wait is given by Rel_Time. When the condition is
299 -- signalled, Timed_Out shows whether or not a time out occurred.
300 -- Status shows whether Cond_Timed_Wait completed successfully.
302 ---------------------
303 -- Initialize_Cond --
304 ---------------------
306 procedure Initialize_Cond (Cond : access Condition_Variable) is
310 hEvent := CreateEvent (null, True, False, Null_Ptr);
311 pragma Assert (hEvent /= 0);
312 Cond.all := Condition_Variable (hEvent);
319 -- No such problem here, DosCloseEventSem has been derived.
320 -- What does such refer to in above comment???
322 procedure Finalize_Cond (Cond : access Condition_Variable) is
326 Result := CloseHandle (HANDLE (Cond.all));
327 pragma Assert (Result = True);
334 procedure Cond_Signal (Cond : access Condition_Variable) is
338 Result := SetEvent (HANDLE (Cond.all));
339 pragma Assert (Result = True);
346 -- Pre-assertion: Cond is posted
349 -- Post-assertion: Cond is posted
353 (Cond : access Condition_Variable;
360 -- Must reset Cond BEFORE L is unlocked.
362 Result_Bool := ResetEvent (HANDLE (Cond.all));
363 pragma Assert (Result_Bool = True);
366 -- No problem if we are interrupted here: if the condition is signaled,
367 -- WaitForSingleObject will simply not block
369 Result := WaitForSingleObject (HANDLE (Cond.all), Wait_Infinite);
370 pragma Assert (Result = 0);
375 ---------------------
376 -- Cond_Timed_Wait --
377 ---------------------
379 -- Pre-assertion: Cond is posted
382 -- Post-assertion: Cond is posted
385 procedure Cond_Timed_Wait
386 (Cond : access Condition_Variable;
389 Timed_Out : out Boolean;
390 Status : out Integer)
395 Int_Rel_Time : DWORD;
399 -- Must reset Cond BEFORE L is unlocked.
401 Result := ResetEvent (HANDLE (Cond.all));
402 pragma Assert (Result = True);
405 -- No problem if we are interrupted here: if the condition is signaled,
406 -- WaitForSingleObject will simply not block
408 if Rel_Time <= 0.0 then
411 Int_Rel_Time := DWORD (Rel_Time);
412 Time_Out := Int_Rel_Time * 1000 +
413 DWORD ((Rel_Time - Duration (Int_Rel_Time)) * 1000.0);
414 Wait_Result := WaitForSingleObject (HANDLE (Cond.all), Time_Out);
416 if Wait_Result = WAIT_TIMEOUT then
426 -- Ensure post-condition
429 Result := SetEvent (HANDLE (Cond.all));
430 pragma Assert (Result = True);
433 Status := Integer (Wait_Result);
440 -- The underlying thread system sets a guard page at the
441 -- bottom of a thread stack, so nothing is needed.
442 -- ??? Check the comment above
444 procedure Stack_Guard (T : ST.Task_ID; On : Boolean) is
453 function Get_Thread_Id (T : ST.Task_ID) return OSI.Thread_Id is
455 return T.Common.LL.Thread;
462 function Self return Task_ID is
466 Self_Id := To_Task_Id (TlsGetValue (TlsIndex));
468 if Self_Id = null then
469 return New_Fake_ATCB;
475 ---------------------
476 -- Initialize_Lock --
477 ---------------------
479 -- Note: mutexes and cond_variables needed per-task basis are
480 -- initialized in Initialize_TCB and the Storage_Error is handled.
481 -- Other mutexes (such as RTS_Lock, Memory_Lock...) used in
482 -- the RTS is initialized before any status change of RTS.
483 -- Therefore raising Storage_Error in the following routines
484 -- should be able to be handled safely.
486 procedure Initialize_Lock
487 (Prio : System.Any_Priority;
490 InitializeCriticalSection (L.Mutex'Access);
491 L.Owner_Priority := 0;
495 procedure Initialize_Lock (L : access RTS_Lock; Level : Lock_Level) is
497 InitializeCriticalSection (CRITICAL_SECTION (L.all)'Unrestricted_Access);
504 procedure Finalize_Lock (L : access Lock) is
506 DeleteCriticalSection (L.Mutex'Access);
509 procedure Finalize_Lock (L : access RTS_Lock) is
511 DeleteCriticalSection (CRITICAL_SECTION (L.all)'Unrestricted_Access);
518 procedure Write_Lock (L : access Lock; Ceiling_Violation : out Boolean) is
520 L.Owner_Priority := Get_Priority (Self);
522 if L.Priority < L.Owner_Priority then
523 Ceiling_Violation := True;
527 EnterCriticalSection (L.Mutex'Access);
529 Ceiling_Violation := False;
533 (L : access RTS_Lock; Global_Lock : Boolean := False) is
535 if not Single_Lock or else Global_Lock then
536 EnterCriticalSection (CRITICAL_SECTION (L.all)'Unrestricted_Access);
540 procedure Write_Lock (T : Task_ID) is
542 if not Single_Lock then
544 (CRITICAL_SECTION (T.Common.LL.L)'Unrestricted_Access);
552 procedure Read_Lock (L : access Lock; Ceiling_Violation : out Boolean) is
554 Write_Lock (L, Ceiling_Violation);
561 procedure Unlock (L : access Lock) is
563 LeaveCriticalSection (L.Mutex'Access);
566 procedure Unlock (L : access RTS_Lock; Global_Lock : Boolean := False) is
568 if not Single_Lock or else Global_Lock then
569 LeaveCriticalSection (CRITICAL_SECTION (L.all)'Unrestricted_Access);
573 procedure Unlock (T : Task_ID) is
575 if not Single_Lock then
577 (CRITICAL_SECTION (T.Common.LL.L)'Unrestricted_Access);
587 Reason : System.Tasking.Task_States) is
589 pragma Assert (Self_ID = Self);
592 Cond_Wait (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access);
594 Cond_Wait (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access);
597 if Self_ID.Deferral_Level = 0
598 and then Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level
601 raise Standard'Abort_Signal;
609 -- This is for use within the run-time system, so abort is
610 -- assumed to be already deferred, and the caller should be
611 -- holding its own ATCB lock.
613 procedure Timed_Sleep
616 Mode : ST.Delay_Modes;
617 Reason : System.Tasking.Task_States;
618 Timedout : out Boolean;
619 Yielded : out Boolean)
621 Check_Time : constant Duration := Monotonic_Clock;
626 Local_Timedout : Boolean;
632 if Mode = Relative then
634 Abs_Time := Duration'Min (Time, Max_Sensible_Delay) + Check_Time;
636 Rel_Time := Time - Check_Time;
640 if Rel_Time > 0.0 then
642 exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level
643 or else Self_ID.Pending_Priority_Change;
646 Cond_Timed_Wait (Self_ID.Common.LL.CV'Access,
647 Single_RTS_Lock'Access, Rel_Time, Local_Timedout, Result);
649 Cond_Timed_Wait (Self_ID.Common.LL.CV'Access,
650 Self_ID.Common.LL.L'Access, Rel_Time, Local_Timedout, Result);
653 exit when Abs_Time <= Monotonic_Clock;
655 if not Local_Timedout then
656 -- somebody may have called Wakeup for us
661 Rel_Time := Abs_Time - Monotonic_Clock;
670 procedure Timed_Delay
673 Mode : ST.Delay_Modes)
675 Check_Time : constant Duration := Monotonic_Clock;
682 -- Only the little window between deferring abort and
683 -- locking Self_ID is the reason we need to
684 -- check for pending abort and priority change below!
692 Write_Lock (Self_ID);
694 if Mode = Relative then
696 Abs_Time := Time + Check_Time;
698 Rel_Time := Time - Check_Time;
702 if Rel_Time > 0.0 then
703 Self_ID.Common.State := Delay_Sleep;
706 if Self_ID.Pending_Priority_Change then
707 Self_ID.Pending_Priority_Change := False;
708 Self_ID.Common.Base_Priority := Self_ID.New_Base_Priority;
709 Set_Priority (Self_ID, Self_ID.Common.Base_Priority);
712 exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level;
715 Cond_Timed_Wait (Self_ID.Common.LL.CV'Access,
716 Single_RTS_Lock'Access, Rel_Time, Timedout, Result);
718 Cond_Timed_Wait (Self_ID.Common.LL.CV'Access,
719 Self_ID.Common.LL.L'Access, Rel_Time, Timedout, Result);
722 exit when Abs_Time <= Monotonic_Clock;
724 Rel_Time := Abs_Time - Monotonic_Clock;
727 Self_ID.Common.State := Runnable;
737 SSL.Abort_Undefer.all;
744 procedure Wakeup (T : Task_ID; Reason : System.Tasking.Task_States) is
746 Cond_Signal (T.Common.LL.CV'Access);
753 procedure Yield (Do_Yield : Boolean := True) is
764 type Prio_Array_Type is array (System.Any_Priority) of Integer;
765 pragma Atomic_Components (Prio_Array_Type);
767 Prio_Array : Prio_Array_Type;
768 -- Global array containing the id of the currently running task for
771 -- Note: we assume that we are on a single processor with run-til-blocked
774 procedure Set_Priority
776 Prio : System.Any_Priority;
777 Loss_Of_Inheritance : Boolean := False)
780 Array_Item : Integer;
783 Res := SetThreadPriority
784 (T.Common.LL.Thread, Interfaces.C.int (Underlying_Priorities (Prio)));
785 pragma Assert (Res = True);
787 -- ??? Work around a bug in NT 4.0 SP3 scheduler
788 -- It looks like when a task with Thread_Priority_Idle (using RT class)
789 -- never reaches its time slice (e.g by doing multiple and simple RV,
790 -- see CXD8002), the scheduler never gives higher priority task a
792 -- Note that this works fine on NT 4.0 SP1
794 if Time_Slice_Val = 0
795 and then Underlying_Priorities (Prio) = Thread_Priority_Idle
796 and then Loss_Of_Inheritance
801 if FIFO_Within_Priorities then
803 -- Annex D requirement [RM D.2.2 par. 9]:
804 -- If the task drops its priority due to the loss of inherited
805 -- priority, it is added at the head of the ready queue for its
806 -- new active priority.
808 if Loss_Of_Inheritance
809 and then Prio < T.Common.Current_Priority
811 Array_Item := Prio_Array (T.Common.Base_Priority) + 1;
812 Prio_Array (T.Common.Base_Priority) := Array_Item;
815 -- Let some processes a chance to arrive
819 -- Then wait for our turn to proceed
821 exit when Array_Item = Prio_Array (T.Common.Base_Priority)
822 or else Prio_Array (T.Common.Base_Priority) = 1;
825 Prio_Array (T.Common.Base_Priority) :=
826 Prio_Array (T.Common.Base_Priority) - 1;
830 T.Common.Current_Priority := Prio;
837 function Get_Priority (T : Task_ID) return System.Any_Priority is
839 return T.Common.Current_Priority;
846 -- There were two paths were we needed to call Enter_Task :
847 -- 1) from System.Task_Primitives.Operations.Initialize
848 -- 2) from System.Tasking.Stages.Task_Wrapper
850 -- The thread initialisation has to be done only for the first case.
852 -- This is because the GetCurrentThread NT call does not return the
853 -- real thread handler but only a "pseudo" one. It is not possible to
854 -- release the thread handle and free the system ressources from this
855 -- "pseudo" handle. So we really want to keep the real thread handle
856 -- set in System.Task_Primitives.Operations.Create_Task during the
859 procedure Enter_Task (Self_ID : Task_ID) is
860 procedure Init_Float;
861 pragma Import (C, Init_Float, "__gnat_init_float");
862 -- Properly initializes the FPU for x86 systems.
867 Succeeded := TlsSetValue (TlsIndex, To_Address (Self_ID));
868 pragma Assert (Succeeded = True);
871 Self_ID.Common.LL.Thread_Id := GetCurrentThreadId;
875 for J in Known_Tasks'Range loop
876 if Known_Tasks (J) = null then
877 Known_Tasks (J) := Self_ID;
878 Self_ID.Known_Tasks_Index := J;
890 function New_ATCB (Entry_Num : Task_Entry_Index) return Task_ID is
892 return new Ada_Task_Control_Block (Entry_Num);
899 procedure Initialize_TCB (Self_ID : Task_ID; Succeeded : out Boolean) is
901 Initialize_Cond (Self_ID.Common.LL.CV'Access);
903 if not Single_Lock then
904 Initialize_Lock (Self_ID.Common.LL.L'Access, ATCB_Level);
914 procedure Create_Task
916 Wrapper : System.Address;
917 Stack_Size : System.Parameters.Size_Type;
918 Priority : System.Any_Priority;
919 Succeeded : out Boolean)
922 TaskId : aliased DWORD;
923 pTaskParameter : System.OS_Interface.PVOID;
926 Entry_Point : PTHREAD_START_ROUTINE;
928 function To_PTHREAD_START_ROUTINE is new
929 Unchecked_Conversion (System.Address, PTHREAD_START_ROUTINE);
932 pTaskParameter := To_Address (T);
934 if Stack_Size = Unspecified_Size then
935 dwStackSize := DWORD (Default_Stack_Size);
937 elsif Stack_Size < Minimum_Stack_Size then
938 dwStackSize := DWORD (Minimum_Stack_Size);
941 dwStackSize := DWORD (Stack_Size);
944 Entry_Point := To_PTHREAD_START_ROUTINE (Wrapper);
946 hTask := CreateThread
951 DWORD (Create_Suspended),
952 TaskId'Unchecked_Access);
954 -- Step 1: Create the thread in blocked mode
960 -- Step 2: set its TCB
962 T.Common.LL.Thread := hTask;
964 -- Step 3: set its priority (child has inherited priority from parent)
966 Set_Priority (T, Priority);
968 -- Step 4: Now, start it for good:
970 Result := ResumeThread (hTask);
971 pragma Assert (Result = 1);
973 Succeeded := Result = 1;
980 procedure Finalize_TCB (T : Task_ID) is
981 Self_ID : Task_ID := T;
985 procedure Free is new
986 Unchecked_Deallocation (Ada_Task_Control_Block, Task_ID);
989 if not Single_Lock then
990 Finalize_Lock (T.Common.LL.L'Access);
993 Finalize_Cond (T.Common.LL.CV'Access);
995 if T.Known_Tasks_Index /= -1 then
996 Known_Tasks (T.Known_Tasks_Index) := null;
999 -- Wait for the thread to terminate then close it. this is needed
1000 -- to release system ressources.
1002 Result := WaitForSingleObject (T.Common.LL.Thread, Wait_Infinite);
1003 pragma Assert (Result /= WAIT_FAILED);
1004 Succeeded := CloseHandle (T.Common.LL.Thread);
1005 pragma Assert (Succeeded = True);
1014 procedure Exit_Task is
1023 procedure Abort_Task (T : Task_ID) is
1028 ----------------------
1029 -- Environment_Task --
1030 ----------------------
1032 function Environment_Task return Task_ID is
1034 return Environment_Task_ID;
1035 end Environment_Task;
1041 procedure Lock_RTS is
1043 Write_Lock (Single_RTS_Lock'Access, Global_Lock => True);
1050 procedure Unlock_RTS is
1052 Unlock (Single_RTS_Lock'Access, Global_Lock => True);
1059 procedure Initialize (Environment_Task : Task_ID) is
1062 Environment_Task_ID := Environment_Task;
1064 if Time_Slice_Val = 0 or else FIFO_Within_Priorities then
1065 Res := OS_Interface.SetPriorityClass
1066 (GetCurrentProcess, Realtime_Priority_Class);
1069 TlsIndex := TlsAlloc;
1071 -- Initialize the lock used to synchronize chain of all ATCBs.
1073 Initialize_Lock (Single_RTS_Lock'Access, RTS_Lock_Level);
1075 Environment_Task.Common.LL.Thread := GetCurrentThread;
1076 Enter_Task (Environment_Task);
1078 -- Create a free ATCB for use on the Fake_ATCB_List
1080 Next_Fake_ATCB := new Fake_ATCB;
1083 ---------------------
1084 -- Monotonic_Clock --
1085 ---------------------
1087 function Monotonic_Clock return Duration
1088 renames System.OS_Primitives.Monotonic_Clock;
1094 function RT_Resolution return Duration is
1096 return 0.000_001; -- 1 micro-second
1103 -- Dummy versions. The only currently working versions is for solaris
1106 function Check_Exit (Self_ID : ST.Task_ID) return Boolean is
1111 --------------------
1112 -- Check_No_Locks --
1113 --------------------
1115 function Check_No_Locks (Self_ID : ST.Task_ID) return Boolean is
1124 function Suspend_Task
1126 Thread_Self : Thread_Id) return Boolean is
1128 if T.Common.LL.Thread /= Thread_Self then
1129 return SuspendThread (T.Common.LL.Thread) = NO_ERROR;
1139 function Resume_Task
1141 Thread_Self : Thread_Id) return Boolean is
1143 if T.Common.LL.Thread /= Thread_Self then
1144 return ResumeThread (T.Common.LL.Thread) = NO_ERROR;
1150 end System.Task_Primitives.Operations;