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verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
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1 files changed, 213 insertions, 0 deletions

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+------------------------------------------------------------------------------
+--                                                                          --
+--                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
+--                                                                          --
+--               SYSTEM.TASKING.PROTECTED_OBJECTS.OPERATIONS                --
+--                                                                          --
+--                                  S p e c                                 --
+--                                                                          --
+--          Copyright (C) 1992-2009, 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 3,  or (at your option) any later ver- --
+-- sion.  GNAT 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.                                     --
+--                                                                          --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception,   --
+-- version 3.1, as published by the Free Software Foundation.               --
+--                                                                          --
+-- You should have received a copy of the GNU General Public License and    --
+-- a copy of the GCC Runtime Library Exception along with this program;     --
+-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
+-- <http://www.gnu.org/licenses/>.                                          --
+--                                                                          --
+-- 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 extended primitives related to protected
+--  objects with entries.
+
+--  The handling of protected objects with no entries is done in
+--  System.Tasking.Protected_Objects, the simple routines for protected
+--  objects with entries in System.Tasking.Protected_Objects.Entries. 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.
+--  Any changes to this interface may require corresponding compiler changes.
+
+with Ada.Exceptions;
+
+with System.Tasking.Protected_Objects.Entries;
+
+package System.Tasking.Protected_Objects.Operations is
+   pragma Elaborate_Body;
+
+   type Communication_Block is private;
+   --  Objects of this type are passed between GNARL calls to allow RTS
+   --  information to be preserved.
+
+   procedure Protected_Entry_Call
+     (Object             : Entries.Protection_Entries_Access;
+      E                  : Protected_Entry_Index;
+      Uninterpreted_Data : System.Address;
+      Mode               : Call_Modes;
+      Block              : out Communication_Block);
+   --  Make a protected entry call to the specified object.
+   --  Pend a protected entry call on the protected object represented
+   --  by Object. A pended call is not queued; it may be executed immediately
+   --  or queued, depending on the state of the entry barrier.
+   --
+   --    E
+   --      The index representing the entry to be called.
+   --
+   --    Uninterpreted_Data
+   --      This will be returned by Next_Entry_Call when this call is serviced.
+   --      It can be used by the compiler to pass information between the
+   --      caller and the server, in particular entry parameters.
+   --
+   --    Mode
+   --      The kind of call to be pended
+   --
+   --    Block
+   --      Information passed between runtime calls by the compiler
+
+   procedure Timed_Protected_Entry_Call
+     (Object                : Entries.Protection_Entries_Access;
+      E                     : Protected_Entry_Index;
+      Uninterpreted_Data    : System.Address;
+      Timeout               : Duration;
+      Mode                  : Delay_Modes;
+      Entry_Call_Successful : out Boolean);
+   --  Same as the Protected_Entry_Call but with time-out specified.
+   --  This routines is used when we do not use ATC mechanism to implement
+   --  timed entry calls.
+
+   procedure Service_Entries (Object : Entries.Protection_Entries_Access);
+   pragma Inline (Service_Entries);
+
+   procedure PO_Service_Entries
+     (Self_ID       : Task_Id;
+      Object        : Entries.Protection_Entries_Access;
+      Unlock_Object : Boolean := True);
+   --  Service all entry queues of the specified object, executing the
+   --  corresponding bodies of any queued entry calls that are waiting
+   --  on True barriers. This is used when the state of a protected
+   --  object may have changed, in particular after the execution of
+   --  the statement sequence of a protected procedure.
+   --
+   --  Note that servicing an entry may change the value of one or more
+   --  barriers, so this routine keeps checking barriers until all of
+   --  them are closed.
+   --
+   --  This must be called with abort deferred and with the corresponding
+   --  object locked.
+   --
+   --  If Unlock_Object is set True, then Object is unlocked on return,
+   --  otherwise Object remains locked and the caller is responsible for
+   --  the required unlock.
+
+   procedure Complete_Entry_Body (Object : Entries.Protection_Entries_Access);
+   --  Called from within an entry body procedure, indicates that the
+   --  corresponding entry call has been serviced.
+
+   procedure Exceptional_Complete_Entry_Body
+     (Object : Entries.Protection_Entries_Access;
+      Ex     : Ada.Exceptions.Exception_Id);
+   --  Perform all of the functions of Complete_Entry_Body. In addition,
+   --  report in Ex the exception whose propagation terminated the entry
+   --  body to the runtime system.
+
+   procedure Cancel_Protected_Entry_Call (Block : in out Communication_Block);
+   --  Attempt to cancel the most recent protected entry call. If the call is
+   --  not queued abortably, wait until it is or until it has completed.
+   --  If the call is actually cancelled, the called object will be
+   --  locked on return from this call. Get_Cancelled (Block) can be
+   --  used to determine if the cancellation took place; there
+   --  may be entries needing service in this case.
+   --
+   --  Block passes information between this and other runtime calls.
+
+   function Enqueued (Block : Communication_Block) return Boolean;
+   --  Returns True if the Protected_Entry_Call which returned the
+   --  specified Block object was queued; False otherwise.
+
+   function Cancelled (Block : Communication_Block) return Boolean;
+   --  Returns True if the Protected_Entry_Call which returned the
+   --  specified Block object was cancelled, False otherwise.
+
+   procedure Requeue_Protected_Entry
+     (Object     : Entries.Protection_Entries_Access;
+      New_Object : Entries.Protection_Entries_Access;
+      E          : Protected_Entry_Index;
+      With_Abort : Boolean);
+   --  If Object = New_Object, queue the protected entry call on Object
+   --   currently being serviced on the queue corresponding to the entry
+   --   represented by E.
+   --
+   --  If Object /= New_Object, transfer the call to New_Object.E,
+   --   executing or queuing it as appropriate.
+   --
+   --  With_Abort---True if the call is to be queued abortably, false
+   --   otherwise.
+
+   procedure Requeue_Task_To_Protected_Entry
+     (New_Object : Entries.Protection_Entries_Access;
+      E          : Protected_Entry_Index;
+      With_Abort : Boolean);
+   --  Transfer task entry call currently being serviced to entry E
+   --   on New_Object.
+   --
+   --  With_Abort---True if the call is to be queued abortably, false
+   --   otherwise.
+
+   function Protected_Count
+     (Object : Entries.Protection_Entries'Class;
+      E      : Protected_Entry_Index)
+      return   Natural;
+   --  Return the number of entry calls to E on Object
+
+   function Protected_Entry_Caller
+     (Object : Entries.Protection_Entries'Class) return Task_Id;
+   --  Return value of E'Caller, where E is the protected entry currently
+   --  being handled. This will only work if called from within an entry
+   --  body, as required by the LRM (C.7.1(14)).
+
+   --  For internal use only
+
+   procedure PO_Do_Or_Queue
+     (Self_ID    : Task_Id;
+      Object     : Entries.Protection_Entries_Access;
+      Entry_Call : Entry_Call_Link);
+   --  This procedure either executes or queues an entry call, depending
+   --  on the status of the corresponding barrier. It assumes that abort
+   --  is deferred and that the specified object is locked.
+
+private
+   type Communication_Block is record
+      Self      : Task_Id;
+      Enqueued  : Boolean := True;
+      Cancelled : Boolean := False;
+   end record;
+   pragma Volatile (Communication_Block);
+
+   --  When a program contains limited interfaces, the compiler generates the
+   --  predefined primitives associated with dispatching selects. One of the
+   --  parameters of these routines is of type Communication_Block. Even if
+   --  the program lacks implementing concurrent types, the tasking runtime is
+   --  dragged in unconditionally because of Communication_Block. To avoid this
+   --  case, the compiler uses type Dummy_Communication_Block which defined in
+   --  System.Soft_Links. If the structure of Communication_Block is changed,
+   --  the corresponding dummy type must be changed as well.
+
+   --  The Communication_Block seems to be a relic. At the moment, the
+   --  compiler seems to be generating unnecessary conditional code based on
+   --  this block. See the code generated for async. select with task entry
+   --  call for another way of solving this ???
+
+end System.Tasking.Protected_Objects.Operations;