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Diffstat (limited to 'gcc-4.2.1/gcc/ada/s-taprop-vms.adb')
-rw-r--r-- | gcc-4.2.1/gcc/ada/s-taprop-vms.adb | 1173 |
1 files changed, 0 insertions, 1173 deletions
diff --git a/gcc-4.2.1/gcc/ada/s-taprop-vms.adb b/gcc-4.2.1/gcc/ada/s-taprop-vms.adb deleted file mode 100644 index 755a2c940..000000000 --- a/gcc-4.2.1/gcc/ada/s-taprop-vms.adb +++ /dev/null @@ -1,1173 +0,0 @@ ------------------------------------------------------------------------------- --- -- --- GNAT 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 -- --- -- --- Copyright (C) 1992-2006, Free Software Foundation, Inc. -- --- -- --- 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, 51 Franklin Street, Fifth Floor, -- --- Boston, MA 02110-1301, 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. -- --- Extensive contributions were provided by Ada Core Technologies, Inc. -- --- -- ------------------------------------------------------------------------------- - --- This is a OpenVMS/Alpha 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 System.Tasking.Debug; --- used for Known_Tasks - -with System.OS_Primitives; --- used for Delay_Modes - -with Interfaces.C; --- used for int --- size_t - -with System.Soft_Links; --- used for Get_Exc_Stack_Addr --- Abort_Defer/Undefer - -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; - use type System.OS_Primitives.OS_Time; - - package SSL renames System.Soft_Links; - - ---------------- - -- Local Data -- - ---------------- - - -- The followings are logically constants, but need to be initialized - -- at run time. - - Single_RTS_Lock : aliased RTS_Lock; - -- This is a lock to allow only one thread of control in the RTS at - -- a time; it is used to execute in mutual exclusion from all other tasks. - -- Used mainly in Single_Lock mode, but also to protect All_Tasks_List - - ATCB_Key : aliased pthread_key_t; - -- Key used to find the Ada Task_Id associated with a thread - - Environment_Task_Id : Task_Id; - -- A variable to hold Task_Id for the environment task. - - 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"); - - Foreign_Task_Elaborated : aliased Boolean := True; - -- Used to identified fake tasks (i.e., non-Ada Threads). - - -------------------- - -- Local Packages -- - -------------------- - - package Specific is - - procedure Initialize (Environment_Task : Task_Id); - pragma Inline (Initialize); - -- Initialize various data needed by this package. - - function Is_Valid_Task return Boolean; - pragma Inline (Is_Valid_Task); - -- Does executing thread have a TCB? - - procedure Set (Self_Id : Task_Id); - pragma Inline (Set); - -- Set the self id for the current task - - function Self return Task_Id; - pragma Inline (Self); - -- Return a pointer to the Ada Task Control Block of the calling task - - end Specific; - - package body Specific is separate; - -- The body of this package is target specific. - - --------------------------------- - -- Support for foreign threads -- - --------------------------------- - - function Register_Foreign_Thread (Thread : Thread_Id) return Task_Id; - -- Allocate and Initialize a new ATCB for the current Thread - - function Register_Foreign_Thread - (Thread : Thread_Id) return Task_Id is separate; - - ----------------------- - -- Local Subprograms -- - ----------------------- - - function To_Task_Id is new Unchecked_Conversion (System.Address, Task_Id); - - function To_Address is new Unchecked_Conversion (Task_Id, System.Address); - - function Get_Exc_Stack_Addr return Address; - -- Replace System.Soft_Links.Get_Exc_Stack_Addr_NT - - procedure Timer_Sleep_AST (ID : Address); - -- Signal the condition variable when AST fires. - - procedure Timer_Sleep_AST (ID : Address) is - Result : Interfaces.C.int; - Self_ID : constant Task_Id := To_Task_Id (ID); - begin - Self_ID.Common.LL.AST_Pending := False; - Result := pthread_cond_signal_int_np (Self_ID.Common.LL.CV'Access); - pragma Assert (Result = 0); - end Timer_Sleep_AST; - - ----------------- - -- 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 - pragma Unreferenced (T); - pragma Unreferenced (On); - 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 renames Specific.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 RTS_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); - pragma Assert (Result = 0 or else Result = ENOMEM); - - if Result = ENOMEM then - raise Storage_Error; - end if; - - L.Prio_Save := 0; - L.Prio := Interfaces.C.int (Prio); - - Result := pthread_mutex_init (L.L'Access, Attributes'Access); - pragma Assert (Result = 0 or else Result = ENOMEM); - - if Result = ENOMEM then - raise Storage_Error; - end if; - - Result := pthread_mutexattr_destroy (Attributes'Access); - pragma Assert (Result = 0); - end Initialize_Lock; - - procedure Initialize_Lock (L : access RTS_Lock; Level : Lock_Level) is - pragma Unreferenced (Level); - - Attributes : aliased pthread_mutexattr_t; - Result : Interfaces.C.int; - - begin - Result := pthread_mutexattr_init (Attributes'Access); - pragma Assert (Result = 0 or else Result = ENOMEM); - - if Result = ENOMEM then - raise Storage_Error; - end if; - --- Don't use, see comment in s-osinte.ads about ERRORCHECK mutexes??? --- Result := pthread_mutexattr_settype_np --- (Attributes'Access, PTHREAD_MUTEX_ERRORCHECK_NP); --- pragma Assert (Result = 0); - --- Result := pthread_mutexattr_setprotocol --- (Attributes'Access, PTHREAD_PRIO_PROTECT); --- pragma Assert (Result = 0); - --- Result := pthread_mutexattr_setprioceiling --- (Attributes'Access, Interfaces.C.int (System.Any_Priority'Last)); --- pragma Assert (Result = 0); - - Result := pthread_mutex_init (L, Attributes'Access); - - pragma Assert (Result = 0 or else Result = ENOMEM); - - if Result = ENOMEM then - raise Storage_Error; - end if; - - Result := pthread_mutexattr_destroy (Attributes'Access); - pragma Assert (Result = 0); - end Initialize_Lock; - - ------------------- - -- Finalize_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; - - ---------------- - -- Write_Lock -- - ---------------- - - procedure Write_Lock (L : access Lock; Ceiling_Violation : out Boolean) is - Self_ID : constant Task_Id := Self; - All_Tasks_Link : constant Task_Id := Self.Common.All_Tasks_Link; - Current_Prio : System.Any_Priority; - Result : Interfaces.C.int; - - begin - Current_Prio := Get_Priority (Self_ID); - - -- If there is no other tasks, no need to check priorities - - if All_Tasks_Link /= Null_Task - and then L.Prio < Interfaces.C.int (Current_Prio) - then - Ceiling_Violation := True; - return; - end if; - - Result := pthread_mutex_lock (L.L'Access); - pragma Assert (Result = 0); - - Ceiling_Violation := False; --- Why is this commented out ??? --- L.Prio_Save := Interfaces.C.int (Current_Prio); --- Set_Priority (Self_ID, System.Any_Priority (L.Prio)); - 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; - - --------------- - -- 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.L'Access); - 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; - - ----------- - -- Sleep -- - ----------- - - procedure Sleep - (Self_ID : Task_Id; - Reason : System.Tasking.Task_States) - is - pragma Unreferenced (Reason); - 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; - - -- EINTR is not considered a failure - - pragma Assert (Result = 0 or else Result = EINTR); - - if Self_ID.Deferral_Level = 0 - and then Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level - then - Unlock (Self_ID); - raise Standard'Abort_Signal; - end if; - end Sleep; - - ----------------- - -- Timed_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 - pragma Unreferenced (Reason); - - Sleep_Time : OS_Time; - Result : Interfaces.C.int; - Status : Cond_Value_Type; - - -- The body below requires more comments ??? - - begin - Timedout := False; - Yielded := False; - - Sleep_Time := To_OS_Time (Time, Mode); - - if Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level - or else Self_ID.Pending_Priority_Change - then - return; - end if; - - Self_ID.Common.LL.AST_Pending := True; - - Sys_Setimr - (Status, 0, Sleep_Time, - Timer_Sleep_AST'Access, To_Address (Self_ID), 0); - - if (Status and 1) /= 1 then - raise Storage_Error; - end if; - - if Single_Lock then - Result := pthread_cond_wait - (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access); - pragma Assert (Result = 0); - - else - Result := pthread_cond_wait - (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access); - pragma Assert (Result = 0); - end if; - - Yielded := True; - - if not Self_ID.Common.LL.AST_Pending then - Timedout := True; - else - Sys_Cantim (Status, To_Address (Self_ID), 0); - pragma Assert ((Status and 1) = 1); - end if; - end Timed_Sleep; - - ----------------- - -- Timed_Delay -- - ----------------- - - procedure Timed_Delay - (Self_ID : Task_Id; - Time : Duration; - Mode : ST.Delay_Modes) - is - Sleep_Time : OS_Time; - Result : Interfaces.C.int; - Status : Cond_Value_Type; - Yielded : Boolean := False; - - begin - if Single_Lock then - Lock_RTS; - end if; - - -- More comments required in body below ??? - - Write_Lock (Self_ID); - - if Time /= 0.0 or else Mode /= Relative then - Sleep_Time := To_OS_Time (Time, Mode); - - if Mode = Relative or else OS_Clock < Sleep_Time then - Self_ID.Common.State := Delay_Sleep; - Self_ID.Common.LL.AST_Pending := True; - - Sys_Setimr - (Status, 0, Sleep_Time, - Timer_Sleep_AST'Access, To_Address (Self_ID), 0); - - if (Status and 1) /= 1 then - raise Storage_Error; - end if; - - 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; - - if Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level then - Sys_Cantim (Status, To_Address (Self_ID), 0); - pragma Assert ((Status and 1) = 1); - exit; - end if; - - if Single_Lock then - Result := pthread_cond_wait - (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access); - pragma Assert (Result = 0); - else - Result := pthread_cond_wait - (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access); - pragma Assert (Result = 0); - end if; - - Yielded := True; - - exit when not Self_ID.Common.LL.AST_Pending; - end loop; - - Self_ID.Common.State := Runnable; - end if; - end if; - - Unlock (Self_ID); - - if Single_Lock then - Unlock_RTS; - end if; - - if not Yielded then - Result := sched_yield; - pragma Assert (Result = 0); - end if; - end Timed_Delay; - - --------------------- - -- Monotonic_Clock -- - --------------------- - - function Monotonic_Clock return Duration - renames System.OS_Primitives.Monotonic_Clock; - - ------------------- - -- RT_Resolution -- - ------------------- - - function RT_Resolution return Duration is - begin - return 10#1.0#E-3; - end RT_Resolution; - - ------------ - -- Wakeup -- - ------------ - - procedure Wakeup (T : Task_Id; Reason : System.Tasking.Task_States) is - pragma Unreferenced (Reason); - 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 - Result : Interfaces.C.int; - pragma Unreferenced (Result); - begin - if Do_Yield then - Result := sched_yield; - end if; - end Yield; - - ------------------ - -- Set_Priority -- - ------------------ - - procedure Set_Priority - (T : Task_Id; - Prio : System.Any_Priority; - Loss_Of_Inheritance : Boolean := False) - is - pragma Unreferenced (Loss_Of_Inheritance); - - Result : Interfaces.C.int; - Param : aliased struct_sched_param; - - begin - T.Common.Current_Priority := Prio; - Param.sched_priority := Interfaces.C.int (Underlying_Priorities (Prio)); - - if Time_Slice_Val > 0 then - Result := pthread_setschedparam - (T.Common.LL.Thread, SCHED_RR, Param'Access); - - elsif Dispatching_Policy = 'F' or else Time_Slice_Val = 0 then - Result := pthread_setschedparam - (T.Common.LL.Thread, SCHED_FIFO, Param'Access); - - else - -- SCHED_OTHER priorities are restricted to the range 8 - 15. - -- Since the translation from Underlying priorities results - -- in a range of 16 - 31, dividing by 2 gives the correct result. - - Param.sched_priority := Param.sched_priority / 2; - Result := pthread_setschedparam - (T.Common.LL.Thread, SCHED_OTHER, Param'Access); - end if; - - pragma Assert (Result = 0); - 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 - 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; - - -------------- - -- 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; - - ------------------- - -- Is_Valid_Task -- - ------------------- - - function Is_Valid_Task return Boolean renames Specific.Is_Valid_Task; - - ----------------------------- - -- Register_Foreign_Thread -- - ----------------------------- - - function Register_Foreign_Thread return Task_Id is - begin - if Is_Valid_Task then - return Self; - else - return Register_Foreign_Thread (pthread_self); - end if; - end Register_Foreign_Thread; - - -------------------- - -- Initialize_TCB -- - -------------------- - - procedure Initialize_TCB (Self_ID : Task_Id; Succeeded : out Boolean) is - Mutex_Attr : aliased pthread_mutexattr_t; - Result : Interfaces.C.int; - Cond_Attr : aliased pthread_condattr_t; - - begin - -- More comments required in body below ??? - - if not Single_Lock then - Result := pthread_mutexattr_init (Mutex_Attr'Access); - pragma Assert (Result = 0 or else Result = ENOMEM); - - if Result = 0 then - Result := pthread_mutex_init (Self_ID.Common.LL.L'Access, - Mutex_Attr'Access); - pragma Assert (Result = 0 or else Result = ENOMEM); - end if; - - if Result /= 0 then - Succeeded := False; - return; - end if; - - Result := pthread_mutexattr_destroy (Mutex_Attr'Access); - pragma Assert (Result = 0); - 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; - Self_ID.Common.LL.Exc_Stack_Ptr := new Exc_Stack_T; - - 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; - - ------------------------ - -- Get_Exc_Stack_Addr -- - ------------------------ - - function Get_Exc_Stack_Addr return Address is - begin - return Self.Common.LL.Exc_Stack_Ptr (Exc_Stack_T'Last)'Address; - end Get_Exc_Stack_Addr; - - ----------------- - -- 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; - Result : Interfaces.C.int; - - function Thread_Body_Access is new - Unchecked_Conversion (System.Address, Thread_Body); - - begin - -- Since the initial signal mask of a thread is inherited from the - -- creator, we need to set our local signal mask mask all signals - -- during the creation operation, to make sure the new thread is - -- not disturbed by signals before it has set its own Task_Id. - - 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, PTHREAD_CREATE_DETACHED); - pragma Assert (Result = 0); - - Result := pthread_attr_setstacksize - (Attributes'Access, Interfaces.C.size_t (Stack_Size)); - pragma Assert (Result = 0); - - -- This call may be unnecessary, not sure. ??? - - Result := - pthread_attr_setinheritsched - (Attributes'Access, PTHREAD_EXPLICIT_SCHED); - pragma Assert (Result = 0); - - Result := pthread_create - (T.Common.LL.Thread'Access, - Attributes'Access, - Thread_Body_Access (Wrapper), - To_Address (T)); - - -- ENOMEM is a valid run-time error. Don't shut down. - - pragma Assert (Result = 0 - or else Result = EAGAIN or else Result = ENOMEM); - - Succeeded := Result = 0; - - Result := pthread_attr_destroy (Attributes'Access); - pragma Assert (Result = 0); - - if Succeeded then - Set_Priority (T, Priority); - end if; - end Create_Task; - - ------------------ - -- Finalize_TCB -- - ------------------ - - procedure Finalize_TCB (T : Task_Id) is - Result : Interfaces.C.int; - Tmp : Task_Id := T; - Is_Self : constant Boolean := T = Self; - - procedure Free is new - Unchecked_Deallocation (Ada_Task_Control_Block, Task_Id); - - procedure Free is new Unchecked_Deallocation - (Exc_Stack_T, Exc_Stack_Ptr_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 (T.Common.LL.Exc_Stack_Ptr); - - Free (Tmp); - - if Is_Self then - Specific.Set (null); - end if; - end Finalize_TCB; - - --------------- - -- Exit_Task -- - --------------- - - procedure Exit_Task is - begin - null; - end Exit_Task; - - ---------------- - -- Abort_Task -- - ---------------- - - procedure Abort_Task (T : Task_Id) is - begin - -- Interrupt Server_Tasks may be waiting on an event flag - - if T.Common.State = Interrupt_Server_Blocked_On_Event_Flag then - Wakeup (T, Interrupt_Server_Blocked_On_Event_Flag); - end if; - end Abort_Task; - - ---------------- - -- Initialize -- - ---------------- - - procedure Initialize (S : in out Suspension_Object) is - Mutex_Attr : aliased pthread_mutexattr_t; - Cond_Attr : aliased pthread_condattr_t; - Result : Interfaces.C.int; - begin - -- Initialize internal state. It is always initialized to False (ARM - -- D.10 par. 6). - - S.State := False; - S.Waiting := False; - - -- Initialize internal mutex - - Result := pthread_mutexattr_init (Mutex_Attr'Access); - pragma Assert (Result = 0 or else Result = ENOMEM); - - if Result = ENOMEM then - raise Storage_Error; - end if; - - Result := pthread_mutex_init (S.L'Access, Mutex_Attr'Access); - pragma Assert (Result = 0 or else Result = ENOMEM); - - if Result = ENOMEM then - Result := pthread_mutexattr_destroy (Mutex_Attr'Access); - pragma Assert (Result = 0); - - raise Storage_Error; - end if; - - Result := pthread_mutexattr_destroy (Mutex_Attr'Access); - pragma Assert (Result = 0); - - -- Initialize internal condition variable - - Result := pthread_condattr_init (Cond_Attr'Access); - pragma Assert (Result = 0 or else Result = ENOMEM); - - if Result /= 0 then - Result := pthread_mutex_destroy (S.L'Access); - pragma Assert (Result = 0); - - if Result = ENOMEM then - raise Storage_Error; - end if; - end if; - - Result := pthread_cond_init (S.CV'Access, Cond_Attr'Access); - pragma Assert (Result = 0 or else Result = ENOMEM); - - if Result /= 0 then - Result := pthread_mutex_destroy (S.L'Access); - pragma Assert (Result = 0); - - if Result = ENOMEM then - Result := pthread_condattr_destroy (Cond_Attr'Access); - pragma Assert (Result = 0); - - raise Storage_Error; - end if; - end if; - - Result := pthread_condattr_destroy (Cond_Attr'Access); - pragma Assert (Result = 0); - end Initialize; - - -------------- - -- Finalize -- - -------------- - - procedure Finalize (S : in out Suspension_Object) is - Result : Interfaces.C.int; - begin - -- Destroy internal mutex - - Result := pthread_mutex_destroy (S.L'Access); - pragma Assert (Result = 0); - - -- Destroy internal condition variable - - Result := pthread_cond_destroy (S.CV'Access); - pragma Assert (Result = 0); - end Finalize; - - ------------------- - -- Current_State -- - ------------------- - - function Current_State (S : Suspension_Object) return Boolean is - begin - -- We do not want to use lock on this read operation. State is marked - -- as Atomic so that we ensure that the value retrieved is correct. - - return S.State; - end Current_State; - - --------------- - -- Set_False -- - --------------- - - procedure Set_False (S : in out Suspension_Object) is - Result : Interfaces.C.int; - begin - SSL.Abort_Defer.all; - - Result := pthread_mutex_lock (S.L'Access); - pragma Assert (Result = 0); - - S.State := False; - - Result := pthread_mutex_unlock (S.L'Access); - pragma Assert (Result = 0); - - SSL.Abort_Undefer.all; - end Set_False; - - -------------- - -- Set_True -- - -------------- - - procedure Set_True (S : in out Suspension_Object) is - Result : Interfaces.C.int; - begin - SSL.Abort_Defer.all; - - Result := pthread_mutex_lock (S.L'Access); - pragma Assert (Result = 0); - - -- If there is already a task waiting on this suspension object then - -- we resume it, leaving the state of the suspension object to False, - -- as it is specified in ARM D.10 par. 9. Otherwise, it just leaves - -- the state to True. - - if S.Waiting then - S.Waiting := False; - S.State := False; - - Result := pthread_cond_signal (S.CV'Access); - pragma Assert (Result = 0); - else - S.State := True; - end if; - - Result := pthread_mutex_unlock (S.L'Access); - pragma Assert (Result = 0); - - SSL.Abort_Undefer.all; - end Set_True; - - ------------------------ - -- Suspend_Until_True -- - ------------------------ - - procedure Suspend_Until_True (S : in out Suspension_Object) is - Result : Interfaces.C.int; - begin - SSL.Abort_Defer.all; - - Result := pthread_mutex_lock (S.L'Access); - pragma Assert (Result = 0); - - if S.Waiting then - -- Program_Error must be raised upon calling Suspend_Until_True - -- if another task is already waiting on that suspension object - -- (ARM D.10 par. 10). - - Result := pthread_mutex_unlock (S.L'Access); - pragma Assert (Result = 0); - - SSL.Abort_Undefer.all; - - raise Program_Error; - else - -- Suspend the task if the state is False. Otherwise, the task - -- continues its execution, and the state of the suspension object - -- is set to False (ARM D.10 par. 9). - - if S.State then - S.State := False; - else - S.Waiting := True; - Result := pthread_cond_wait (S.CV'Access, S.L'Access); - end if; - - Result := pthread_mutex_unlock (S.L'Access); - pragma Assert (Result = 0); - - SSL.Abort_Undefer.all; - end if; - end Suspend_Until_True; - - ---------------- - -- Check_Exit -- - ---------------- - - -- Dummy version - - function Check_Exit (Self_ID : ST.Task_Id) return Boolean is - pragma Unreferenced (Self_ID); - begin - return True; - end Check_Exit; - - -------------------- - -- Check_No_Locks -- - -------------------- - - function Check_No_Locks (Self_ID : ST.Task_Id) return Boolean is - pragma Unreferenced (Self_ID); - 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_RTS -- - -------------- - - procedure Lock_RTS is - begin - Write_Lock (Single_RTS_Lock'Access, Global_Lock => True); - end Lock_RTS; - - ---------------- - -- Unlock_RTS -- - ---------------- - - procedure Unlock_RTS is - begin - Unlock (Single_RTS_Lock'Access, Global_Lock => True); - end Unlock_RTS; - - ------------------ - -- Suspend_Task -- - ------------------ - - function Suspend_Task - (T : ST.Task_Id; - Thread_Self : Thread_Id) return Boolean - is - pragma Unreferenced (T); - pragma Unreferenced (Thread_Self); - begin - return False; - end Suspend_Task; - - ----------------- - -- Resume_Task -- - ----------------- - - function Resume_Task - (T : ST.Task_Id; - Thread_Self : Thread_Id) return Boolean - is - pragma Unreferenced (T); - pragma Unreferenced (Thread_Self); - begin - return False; - end Resume_Task; - - ---------------- - -- Initialize -- - ---------------- - - procedure Initialize (Environment_Task : Task_Id) is - begin - Environment_Task_Id := Environment_Task; - - SSL.Get_Exc_Stack_Addr := Get_Exc_Stack_Addr'Access; - - -- Initialize the lock used to synchronize chain of all ATCBs - - Initialize_Lock (Single_RTS_Lock'Access, RTS_Lock_Level); - - Specific.Initialize (Environment_Task); - - Enter_Task (Environment_Task); - end Initialize; - -end System.Task_Primitives.Operations; |