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Diffstat (limited to 'gcc/ada/5gtaprop.adb')
| -rw-r--r-- | gcc/ada/5gtaprop.adb | 968 |
1 files changed, 968 insertions, 0 deletions
diff --git a/gcc/ada/5gtaprop.adb b/gcc/ada/5gtaprop.adb new file mode 100644 index 00000000000..0ec29dfb2c3 --- /dev/null +++ b/gcc/ada/5gtaprop.adb @@ -0,0 +1,968 @@ +------------------------------------------------------------------------------ +-- -- +-- 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: 1.37 $ +-- -- +-- 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 Intialize_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; |