+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
--- --
--- 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 --
--- --
--- B o d y --
--- --
--- $Revision: 1.2 $
--- --
--- Copyright (C) 1991-2001, Florida State University --
--- --
--- GNARL is free software; you can redistribute it and/or modify it under --
--- terms of the GNU General Public License as published by the Free Soft- --
--- ware Foundation; either version 2, or (at your option) any later ver- --
--- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
--- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
--- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
--- for more details. You should have received a copy of the GNU General --
--- Public License distributed with GNARL; see file COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
--- --
--- As a special exception, if other files instantiate generics from this --
--- unit, or you link this unit with other files to produce an executable, --
--- this unit does not by itself cause the resulting executable to be --
--- covered by the GNU General Public License. This exception does not --
--- however invalidate any other reasons why the executable file might be --
--- covered by the GNU Public License. --
--- --
--- GNARL was developed by the GNARL team at Florida State University. It is --
--- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
--- State University (http://www.gnat.com). --
--- --
-------------------------------------------------------------------------------
-
--- This is an Irix (old athread library) version of this package
-
--- This package contains all the GNULL primitives that interface directly
--- with the underlying OS.
-
-pragma Polling (Off);
--- Turn off polling, we do not want ATC polling to take place during
--- tasking operations. It causes infinite loops and other problems.
-
-with Interfaces.C;
--- used for int
--- size_t
-
-with System.Tasking.Debug;
--- used for Known_Tasks
-
-with System.Task_Info;
-
-with System.Interrupt_Management;
--- used for Keep_Unmasked
--- Abort_Task_Interrupt
--- Interrupt_ID
-
-with System.Parameters;
--- used for Size_Type
-
-with System.Tasking;
--- used for Ada_Task_Control_Block
--- Task_ID
-
-with System.Program_Info;
--- used for Default_Task_Stack
--- Default_Time_Slice
--- Stack_Guard_Pages
--- Pthread_Sched_Signal
--- Pthread_Arena_Size
-
-with System.Soft_Links;
--- used for Defer/Undefer_Abort
-
--- Note that we do not use System.Tasking.Initialization directly since
--- this is a higher level package that we shouldn't depend on. For example
--- when using the restricted run time, it is replaced by
--- System.Tasking.Restricted.Initialization
-
-with System.OS_Primitives;
--- used for Delay_Modes
-
-with System.Storage_Elements;
--- used for To_Address
-
-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;
-
- ------------------
- -- Local Data --
- ------------------
-
- -- The followings are logically constants, but need to be initialized
- -- at run time.
-
- All_Tasks_L : aliased System.Task_Primitives.RTS_Lock;
- -- See comments on locking rules in System.Tasking (spec).
-
- Environment_Task_ID : Task_ID;
- -- A variable to hold Task_ID for the environment task.
-
- Locking_Policy : Character;
- pragma Import (C, Locking_Policy, "__gl_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;
-
- -----------------------
- -- Local Subprograms --
- -----------------------
-
- 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);
-
- -------------------
- -- Stack_Guard --
- -------------------
-
- -- The underlying thread system sets a guard page at the
- -- bottom of a thread stack, so nothing is needed.
- -- ??? Check the comment above
-
- procedure Stack_Guard (T : ST.Task_ID; On : Boolean) is
- begin
- null;
- end Stack_Guard;
-
- --------------------
- -- Get_Thread_Id --
- --------------------
-
- function Get_Thread_Id (T : ST.Task_ID) return OSI.Thread_Id is
- begin
- return T.Common.LL.Thread;
- end Get_Thread_Id;
-
- ----------
- -- Self --
- ----------
-
- function Self return Task_ID is
- begin
- return To_Task_ID (pthread_get_current_ada_tcb);
- end Self;
-
- ---------------------
- -- Initialize_Lock --
- ---------------------
-
- -- Note: mutexes and cond_variables needed per-task basis are
- -- initialized in Initialize_TCB and the Storage_Error is
- -- handled. Other mutexes (such as All_Tasks_Lock, Memory_Lock...)
- -- used in RTS is initialized before any status change of RTS.
- -- Therefore rasing Storage_Error in the following routines
- -- should be able to be handled safely.
-
- 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;
-
- -------------------
- -- Finalize_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;
-
- ----------------
- -- Write_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) is
- Result : Interfaces.C.int;
-
- begin
- Result := pthread_mutex_lock (L);
- pragma Assert (Result = 0);
- end Write_Lock;
-
- procedure Write_Lock (T : Task_ID) is
- Result : Interfaces.C.int;
-
- begin
- Result := pthread_mutex_lock (T.Common.LL.L'Access);
- pragma Assert (Result = 0);
- end Write_Lock;
-
- ---------------
- -- Read_Lock --
- ---------------
-
- procedure Read_Lock (L : access Lock; Ceiling_Violation : out Boolean) is
- begin
- Write_Lock (L, Ceiling_Violation);
- end Read_Lock;
-
- ------------
- -- Unlock --
- ------------
-
- 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) is
- Result : Interfaces.C.int;
-
- begin
- Result := pthread_mutex_unlock (L);
- pragma Assert (Result = 0);
- end Unlock;
-
- procedure Unlock (T : Task_ID) is
- Result : Interfaces.C.int;
-
- begin
- Result := pthread_mutex_unlock (T.Common.LL.L'Access);
- pragma Assert (Result = 0);
- end Unlock;
-
- -------------
- -- Sleep --
- -------------
-
- procedure Sleep
- (Self_ID : ST.Task_ID;
- Reason : System.Tasking.Task_States) is
-
- Result : Interfaces.C.int;
-
- begin
- pragma Assert (Self_ID = Self);
- Result := pthread_cond_wait (Self_ID.Common.LL.CV'Access,
- Self_ID.Common.LL.L'Access);
- -- EINTR is not considered a failure.
- pragma Assert (Result = 0 or else Result = EINTR);
- end Sleep;
-
- -- Note that we are relying heaviliy here on the GNAT feature
- -- that Calendar.Time, System.Real_Time.Time, Duration, and
- -- System.Real_Time.Time_Span are all represented in the same
- -- way, i.e., as a 64-bit count of nanoseconds.
- -- This allows us to always pass the timeout value as a Duration.
-
- -- ????? .........
- -- We are taking liberties here with the semantics of the delays.
- -- That is, we make no distinction between delays on the Calendar clock
- -- and delays on the Real_Time clock. That is technically incorrect, if
- -- the Calendar clock happens to be reset or adjusted.
- -- To solve this defect will require modification to the compiler
- -- interface, so that it can pass through more information, to tell
- -- us here which clock to use!
-
- -- cond_timedwait will return if any of the following happens:
- -- 1) some other task did cond_signal on this condition variable
- -- In this case, the return value is 0
- -- 2) the call just returned, for no good reason
- -- This is called a "spurious wakeup".
- -- In this case, the return value may also be 0.
- -- 3) the time delay expires
- -- In this case, the return value is ETIME
- -- 4) this task received a signal, which was handled by some
- -- handler procedure, and now the thread is resuming execution
- -- UNIX calls this an "interrupted" system call.
- -- In this case, the return value is EINTR
-
- -- If the cond_timedwait returns 0 or EINTR, it is still
- -- possible that the time has actually expired, and by chance
- -- a signal or cond_signal occurred at around the same time.
-
- -- We have also observed that on some OS's the value ETIME
- -- will be returned, but the clock will show that the full delay
- -- has not yet expired.
-
- -- For these reasons, we need to check the clock after return
- -- from cond_timedwait. If the time has expired, we will set
- -- Timedout = True.
-
- -- This check might be omitted for systems on which the
- -- cond_timedwait() never returns early or wakes up spuriously.
-
- -- Annex D requires that completion of a delay cause the task
- -- to go to the end of its priority queue, regardless of whether
- -- the task actually was suspended by the delay. Since
- -- cond_timedwait does not do this on Solaris, we add a call
- -- to thr_yield at the end. We might do this at the beginning,
- -- instead, but then the round-robin effect would not be the
- -- same; the delayed task would be ahead of other tasks of the
- -- same priority that awoke while it was sleeping.
-
- -- For Timed_Sleep, we are expecting possible cond_signals
- -- to indicate other events (e.g., completion of a RV or
- -- completion of the abortable part of an async. select),
- -- we want to always return if interrupted. The caller will
- -- be responsible for checking the task state to see whether
- -- the wakeup was spurious, and to go back to sleep again
- -- in that case. We don't need to check for pending abort
- -- or priority change on the way in our out; that is the
- -- caller's responsibility.
-
- -- For Timed_Delay, we are not expecting any cond_signals or
- -- other interruptions, except for priority changes and aborts.
- -- Therefore, we don't want to return unless the delay has
- -- actually expired, or the call has been aborted. In this
- -- case, since we want to implement the entire delay statement
- -- semantics, we do need to check for pending abort and priority
- -- changes. We can quietly handle priority changes inside the
- -- procedure, since there is no entry-queue reordering involved.
-
- -----------------
- -- Timed_Sleep --
- -----------------
-
- -- This is for use within the run-time system, so abort is
- -- assumed to be already deferred, and the caller should be
- -- holding its own ATCB lock.
- -- Yielded should be False unles we know for certain that the
- -- operation resulted in the calling task going to the end of
- -- the dispatching queue for its priority.
- -- ?????
- -- This version presumes the worst, so Yielded is always False.
- -- On some targets, if cond_timedwait always yields, we could
- -- set Yielded to True just before the cond_timedwait call.
-
- 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;
-
- Result := pthread_cond_timedwait (Self_ID.Common.LL.CV'Access,
- Self_ID.Common.LL.L'Access, Request'Access);
-
- exit when Abs_Time <= Monotonic_Clock;
-
- if Result = 0 or Result = EINTR then
- -- somebody may have called Wakeup for us
- Timedout := False;
- exit;
- end if;
-
- pragma Assert (Result = ETIMEDOUT
- or else (Result = -1 and then errno = EAGAIN));
- end loop;
- end if;
- end Timed_Sleep;
-
- -----------------
- -- Timed_Delay --
- -----------------
-
- -- This is for use in implementing delay statements, so
- -- we assume the caller is abort-deferred but is holding
- -- no locks.
-
- 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
-
- -- Only the little window between deferring abort and
- -- locking Self_ID is the reason we need to
- -- check for pending abort and priority change below! :(
-
- SSL.Abort_Defer.all;
- 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;
-
- 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 = -1 and then errno = EAGAIN) or else
- Result = EINTR);
- end loop;
-
- Self_ID.Common.State := Runnable;
- end if;
-
- Unlock (Self_ID);
- pthread_yield;
- SSL.Abort_Undefer.all;
- end Timed_Delay;
-
- ---------------------
- -- Monotonic_Clock --
- ---------------------
-
- 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;
-
- -------------------
- -- RT_Resolution --
- -------------------
-
- function RT_Resolution return Duration is
- begin
- return 10#1.0#E-6;
- end RT_Resolution;
-
- ------------
- -- Wakeup --
- ------------
-
- 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;
-
- -----------
- -- Yield --
- -----------
-
- procedure Yield (Do_Yield : Boolean := True) is
- begin
- if Do_Yield then
- pthread_yield;
- end if;
- end Yield;
-
- ------------------
- -- Set_Priority --
- ------------------
-
- 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;
-
- ------------------
- -- Get_Priority --
- ------------------
-
- function Get_Priority (T : Task_ID) return System.Any_Priority is
- begin
- return T.Common.Current_Priority;
- end Get_Priority;
-
- ----------------
- -- Enter_Task --
- ----------------
-
- 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_All_Tasks_List;
-
- for I in Known_Tasks'Range loop
- if Known_Tasks (I) = null then
- Known_Tasks (I) := Self_ID;
- Self_ID.Known_Tasks_Index := I;
- exit;
- end if;
- end loop;
-
- Unlock_All_Tasks_List;
- end Enter_Task;
-
- --------------
- -- New_ATCB --
- --------------
-
- function New_ATCB (Entry_Num : Task_Entry_Index) return Task_ID is
- begin
- return new Ada_Task_Control_Block (Entry_Num);
- end New_ATCB;
-
- ----------------------
- -- Initialize_TCB --
- ----------------------
-
- procedure Initialize_TCB (Self_ID : Task_ID; Succeeded : out Boolean) is
- Result : Interfaces.C.int;
- Cond_Attr : aliased pthread_condattr_t;
-
- begin
- Initialize_Lock (Self_ID.Common.LL.L'Access, ATCB_Level);
-
- Result := pthread_condattr_init (Cond_Attr'Access);
- pragma Assert (Result = 0 or else Result = ENOMEM);
-
- if Result /= 0 then
- Result := pthread_mutex_destroy (Self_ID.Common.LL.L'Access);
- pragma Assert (Result = 0);
- Succeeded := False;
- return;
- 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
- Result := pthread_mutex_destroy (Self_ID.Common.LL.L'Access);
- pragma Assert (Result = 0);
- Succeeded := False;
- end if;
-
- Result := pthread_condattr_destroy (Cond_Attr'Access);
- pragma Assert (Result = 0);
- end Initialize_TCB;
-
- -----------------
- -- Create_Task --
- -----------------
-
- 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;
-
- -- Since the initial signal mask of a thread is inherited from the
- -- creator, and the Environment task has all its signals masked, we
- -- do not need to manipulate caller's signal mask at this point.
- -- All tasks in RTS will have All_Tasks_Mask initially.
-
- 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;
-
- ------------------
- -- Finalize_TCB --
- ------------------
-
- 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
- Result := pthread_mutex_destroy (T.Common.LL.L'Access);
- pragma Assert (Result = 0);
- 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;
-
- ---------------
- -- Exit_Task --
- ---------------
-
- procedure Exit_Task is
- begin
- pthread_exit (System.Null_Address);
- end Exit_Task;
-
- ----------------
- -- Abort_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;
-
- ----------------
- -- Check_Exit --
- ----------------
-
- -- Dummy versions. The only currently working versions is for solaris
- -- (native).
-
- function Check_Exit (Self_ID : ST.Task_ID) return Boolean is
- begin
- return True;
- end Check_Exit;
-
- --------------------
- -- Check_No_Locks --
- --------------------
-
- function Check_No_Locks (Self_ID : ST.Task_ID) return Boolean is
- begin
- return True;
- end Check_No_Locks;
-
- ----------------------
- -- Environment_Task --
- ----------------------
-
- function Environment_Task return Task_ID is
- begin
- return Environment_Task_ID;
- end Environment_Task;
-
- -------------------------
- -- Lock_All_Tasks_List --
- -------------------------
-
- procedure Lock_All_Tasks_List is
- begin
- Write_Lock (All_Tasks_L'Access);
- end Lock_All_Tasks_List;
-
- ---------------------------
- -- Unlock_All_Tasks_List --
- ---------------------------
-
- procedure Unlock_All_Tasks_List is
- begin
- Unlock (All_Tasks_L'Access);
- end Unlock_All_Tasks_List;
-
- ------------------
- -- Suspend_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_suspend (T.Common.LL.Thread) = 0;
- else
- return True;
- end if;
- end Suspend_Task;
-
- -----------------
- -- Resume_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;
-
- ----------------
- -- Initialize --
- ----------------
-
- procedure Initialize (Environment_Task : Task_ID) is
- begin
- Environment_Task_ID := Environment_Task;
-
- Initialize_Lock (All_Tasks_L'Access, All_Tasks_Level);
- -- Initialize the lock used to synchronize chain of all ATCBs.
-
- 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; -- Insufficient resources.
- end if;
-
- end Initialize_Athread_Library;
-
-begin
- Initialize_Athread_Library;
-end System.Task_Primitives.Operations;
projects / msp430-gcc.git / blobdiff