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Diffstat (limited to 'gcc-4.2.1/gcc/ada/s-tpoben.adb')
| -rw-r--r-- | gcc-4.2.1/gcc/ada/s-tpoben.adb | 386 |
1 files changed, 0 insertions, 386 deletions
diff --git a/gcc-4.2.1/gcc/ada/s-tpoben.adb b/gcc-4.2.1/gcc/ada/s-tpoben.adb deleted file mode 100644 index 182ade841..000000000 --- a/gcc-4.2.1/gcc/ada/s-tpoben.adb +++ /dev/null @@ -1,386 +0,0 @@ ------------------------------------------------------------------------------- --- -- --- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- --- -- --- S Y S T E M . T A S K I N G . P R O T E C T E D _ O B J E C T S . -- --- E N T R I E S -- --- -- --- B o d y -- --- -- --- Copyright (C) 1998-2005, 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 package contains all the simple primitives related to protected --- objects with entries (i.e init, lock, unlock). - --- The handling of protected objects with no entries is done in --- System.Tasking.Protected_Objects, the complex routines for protected --- objects with entries in System.Tasking.Protected_Objects.Operations. - --- The split between Entries and Operations is needed to break circular --- dependencies inside the run time. - --- Note: the compiler generates direct calls to this interface, via Rtsfind - -with Ada.Exceptions; --- Used for Exception_Occurrence_Access --- Raise_Exception - -with System.Task_Primitives.Operations; --- Used for Initialize_Lock --- Write_Lock --- Unlock --- Get_Priority --- Wakeup - -with System.Tasking.Initialization; --- Used for Defer_Abort, --- Undefer_Abort, --- Change_Base_Priority - -pragma Elaborate_All (System.Tasking.Initialization); --- This insures that tasking is initialized if any protected objects are --- created. - -with System.Parameters; --- Used for Single_Lock - -package body System.Tasking.Protected_Objects.Entries is - - package STPO renames System.Task_Primitives.Operations; - - use Parameters; - use Task_Primitives.Operations; - use Ada.Exceptions; - - ---------------- - -- Local Data -- - ---------------- - - Locking_Policy : Character; - pragma Import (C, Locking_Policy, "__gl_locking_policy"); - - -------------- - -- Finalize -- - -------------- - - procedure Finalize (Object : in out Protection_Entries) is - Entry_Call : Entry_Call_Link; - Caller : Task_Id; - Ceiling_Violation : Boolean; - Self_ID : constant Task_Id := STPO.Self; - Old_Base_Priority : System.Any_Priority; - - begin - if Object.Finalized then - return; - end if; - - STPO.Write_Lock (Object.L'Unrestricted_Access, Ceiling_Violation); - - if Single_Lock then - Lock_RTS; - end if; - - if Ceiling_Violation then - - -- Dip our own priority down to ceiling of lock. See similar code in - -- Tasking.Entry_Calls.Lock_Server. - - STPO.Write_Lock (Self_ID); - Old_Base_Priority := Self_ID.Common.Base_Priority; - Self_ID.New_Base_Priority := Object.Ceiling; - Initialization.Change_Base_Priority (Self_ID); - STPO.Unlock (Self_ID); - - if Single_Lock then - Unlock_RTS; - end if; - - STPO.Write_Lock (Object.L'Unrestricted_Access, Ceiling_Violation); - - if Ceiling_Violation then - Raise_Exception (Program_Error'Identity, "Ceiling Violation"); - end if; - - if Single_Lock then - Lock_RTS; - end if; - - Object.Old_Base_Priority := Old_Base_Priority; - Object.Pending_Action := True; - end if; - - -- Send program_error to all tasks still queued on this object - - for E in Object.Entry_Queues'Range loop - Entry_Call := Object.Entry_Queues (E).Head; - - while Entry_Call /= null loop - Caller := Entry_Call.Self; - Entry_Call.Exception_To_Raise := Program_Error'Identity; - - STPO.Write_Lock (Caller); - Initialization.Wakeup_Entry_Caller (Self_ID, Entry_Call, Done); - STPO.Unlock (Caller); - - exit when Entry_Call = Object.Entry_Queues (E).Tail; - Entry_Call := Entry_Call.Next; - end loop; - end loop; - - Object.Finalized := True; - - if Single_Lock then - Unlock_RTS; - end if; - - STPO.Unlock (Object.L'Unrestricted_Access); - - STPO.Finalize_Lock (Object.L'Unrestricted_Access); - end Finalize; - - ------------------------------------- - -- Has_Interrupt_Or_Attach_Handler -- - ------------------------------------- - - function Has_Interrupt_Or_Attach_Handler - (Object : Protection_Entries_Access) - return Boolean - is - pragma Warnings (Off, Object); - begin - return False; - end Has_Interrupt_Or_Attach_Handler; - - ----------------------------------- - -- Initialize_Protection_Entries -- - ----------------------------------- - - procedure Initialize_Protection_Entries - (Object : Protection_Entries_Access; - Ceiling_Priority : Integer; - Compiler_Info : System.Address; - Entry_Bodies : Protected_Entry_Body_Access; - Find_Body_Index : Find_Body_Index_Access) - is - Init_Priority : Integer := Ceiling_Priority; - Self_ID : constant Task_Id := STPO.Self; - - begin - if Init_Priority = Unspecified_Priority then - Init_Priority := System.Priority'Last; - end if; - - if Locking_Policy = 'C' - and then Has_Interrupt_Or_Attach_Handler (Object) - and then Init_Priority not in System.Interrupt_Priority - then - -- Required by C.3.1(11) - - raise Program_Error; - end if; - - Initialization.Defer_Abort (Self_ID); - Initialize_Lock (Init_Priority, Object.L'Access); - Initialization.Undefer_Abort (Self_ID); - Object.Ceiling := System.Any_Priority (Init_Priority); - Object.Owner := Null_Task; - Object.Compiler_Info := Compiler_Info; - Object.Pending_Action := False; - Object.Call_In_Progress := null; - Object.Entry_Bodies := Entry_Bodies; - Object.Find_Body_Index := Find_Body_Index; - - for E in Object.Entry_Queues'Range loop - Object.Entry_Queues (E).Head := null; - Object.Entry_Queues (E).Tail := null; - end loop; - end Initialize_Protection_Entries; - - ------------------ - -- Lock_Entries -- - ------------------ - - procedure Lock_Entries - (Object : Protection_Entries_Access; Ceiling_Violation : out Boolean) - is - begin - if Object.Finalized then - Raise_Exception - (Program_Error'Identity, "Protected Object is finalized"); - end if; - - -- If pragma Detect_Blocking is active then, as described in the ARM - -- 9.5.1, par. 15, we must check whether this is an external call on a - -- protected subprogram with the same target object as that of the - -- protected action that is currently in progress (i.e., if the caller - -- is already the protected object's owner). If this is the case hence - -- Program_Error must be raised. - - if Detect_Blocking and then Object.Owner = Self then - raise Program_Error; - end if; - - -- The lock is made without defering abort - - -- Therefore the abort has to be deferred before calling this routine. - -- This means that the compiler has to generate a Defer_Abort call - -- before the call to Lock. - - -- The caller is responsible for undeferring abort, and compiler - -- generated calls must be protected with cleanup handlers to ensure - -- that abort is undeferred in all cases. - - pragma Assert (STPO.Self.Deferral_Level > 0); - Write_Lock (Object.L'Access, Ceiling_Violation); - - -- We are entering in a protected action, so that we increase the - -- protected object nesting level (if pragma Detect_Blocking is - -- active), and update the protected object's owner. - - if Detect_Blocking then - declare - Self_Id : constant Task_Id := Self; - - begin - -- Update the protected object's owner - - Object.Owner := Self_Id; - - -- Increase protected object nesting level - - Self_Id.Common.Protected_Action_Nesting := - Self_Id.Common.Protected_Action_Nesting + 1; - end; - end if; - - end Lock_Entries; - - procedure Lock_Entries (Object : Protection_Entries_Access) is - Ceiling_Violation : Boolean; - - begin - Lock_Entries (Object, Ceiling_Violation); - - if Ceiling_Violation then - Raise_Exception (Program_Error'Identity, "Ceiling Violation"); - end if; - end Lock_Entries; - - ---------------------------- - -- Lock_Read_Only_Entries -- - ---------------------------- - - procedure Lock_Read_Only_Entries (Object : Protection_Entries_Access) is - Ceiling_Violation : Boolean; - - begin - if Object.Finalized then - Raise_Exception - (Program_Error'Identity, "Protected Object is finalized"); - end if; - - -- If pragma Detect_Blocking is active then, as described in the ARM - -- 9.5.1, par. 15, we must check whether this is an external call on a - -- protected subprogram with the same target object as that of the - -- protected action that is currently in progress (i.e., if the caller - -- is already the protected object's owner). If this is the case hence - -- Program_Error must be raised. - - -- Note that in this case (getting read access), several tasks may - -- have read ownership of the protected object, so that this method of - -- storing the (single) protected object's owner does not work - -- reliably for read locks. However, this is the approach taken for two - -- major reasosn: first, this function is not currently being used (it - -- is provided for possible future use), and second, it largely - -- simplifies the implementation. - - if Detect_Blocking and then Object.Owner = Self then - raise Program_Error; - end if; - - Read_Lock (Object.L'Access, Ceiling_Violation); - - if Ceiling_Violation then - Raise_Exception (Program_Error'Identity, "Ceiling Violation"); - end if; - - -- We are entering in a protected action, so that we increase the - -- protected object nesting level (if pragma Detect_Blocking is - -- active), and update the protected object's owner. - - if Detect_Blocking then - declare - Self_Id : constant Task_Id := Self; - - begin - -- Update the protected object's owner - - Object.Owner := Self_Id; - - -- Increase protected object nesting level - - Self_Id.Common.Protected_Action_Nesting := - Self_Id.Common.Protected_Action_Nesting + 1; - end; - end if; - end Lock_Read_Only_Entries; - - -------------------- - -- Unlock_Entries -- - -------------------- - - procedure Unlock_Entries (Object : Protection_Entries_Access) is - begin - -- We are exiting from a protected action, so that we decrease the - -- protected object nesting level (if pragma Detect_Blocking is - -- active), and remove ownership of the protected object. - - if Detect_Blocking then - declare - Self_Id : constant Task_Id := Self; - - begin - -- Calls to this procedure can only take place when being within - -- a protected action and when the caller is the protected - -- object's owner. - - pragma Assert (Self_Id.Common.Protected_Action_Nesting > 0 - and then Object.Owner = Self_Id); - - -- Remove ownership of the protected object - - Object.Owner := Null_Task; - - Self_Id.Common.Protected_Action_Nesting := - Self_Id.Common.Protected_Action_Nesting - 1; - end; - end if; - - Unlock (Object.L'Access); - end Unlock_Entries; - -end System.Tasking.Protected_Objects.Entries; |