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+------------------------------------------------------------------------------
+--                                                                          --
+--                GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                  --
+--                                                                          --
+--                SYSTEM.TASKING.PROTECTED_OBJECTS.ENTRIES                  --
+--                                                                          --
+--                                  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 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.
+--  Any changes to this interface may require corresponding compiler changes.
+
+with Ada.Finalization;
+with Ada.Unchecked_Conversion;
+
+package System.Tasking.Protected_Objects.Entries is
+   pragma Elaborate_Body;
+
+   subtype Positive_Protected_Entry_Index is
+     Protected_Entry_Index range  1 .. Protected_Entry_Index'Last;
+
+   type Find_Body_Index_Access is access
+     function
+       (O : System.Address;
+        E : Protected_Entry_Index)
+        return Protected_Entry_Index;
+
+   type Protected_Entry_Body_Array is
+     array (Positive_Protected_Entry_Index range <>) of Entry_Body;
+   --  This is an array of the executable code for all entry bodies of
+   --  a protected type.
+
+   type Protected_Entry_Body_Access is access all Protected_Entry_Body_Array;
+
+   type Protected_Entry_Queue_Array is
+     array (Protected_Entry_Index range <>) of Entry_Queue;
+
+   --  This type contains the GNARL state of a protected object. The
+   --  application-defined portion of the state (i.e. private objects)
+   --  is maintained by the compiler-generated code.
+   --  note that there is a simplified version of this type declared in
+   --  System.Tasking.PO_Simple that handle the simple case (no entries).
+
+   type Protection_Entries (Num_Entries : Protected_Entry_Index) is new
+     Ada.Finalization.Limited_Controlled
+   with record
+      L                 : aliased Task_Primitives.Lock;
+      --  The underlying lock associated with a Protection_Entries.
+      --  Note that you should never (un)lock Object.L directly, but instead
+      --  use Lock_Entries/Unlock_Entries.
+
+      Compiler_Info : System.Address;
+      --  Pointer to compiler-generated record representing protected object
+
+      Call_In_Progress : Entry_Call_Link;
+      --  Pointer to the entry call being executed (if any)
+
+      Ceiling : System.Any_Priority;
+      --  Ceiling priority associated with the protected object
+
+      New_Ceiling : System.Any_Priority;
+      --  New ceiling priority associated to the protected object. In case
+      --  of assignment of a new ceiling priority to the protected object the
+      --  frontend generates a call to set_ceiling to save the new value in
+      --  this field. After such assignment this value can be read by means
+      --  of the 'Priority attribute, which generates a call to get_ceiling.
+      --  However, the ceiling of the protected object will not be changed
+      --  until completion of the protected action in which the assignment
+      --  has been executed (AARM D.5.2 (10/2)).
+
+      Owner : Task_Id;
+      --  This field contains the protected object's owner. Null_Task
+      --  indicates that the protected object is not currently being used.
+      --  This information is used for detecting the type of potentially
+      --  blocking operations described in the ARM 9.5.1, par. 15 (external
+      --  calls on a protected subprogram with the same target object as that
+      --  of the protected action).
+
+      Old_Base_Priority : System.Any_Priority;
+      --  Task's base priority when the protected operation was called
+
+      Pending_Action : Boolean;
+      --  Flag indicating that priority has been dipped temporarily in order
+      --  to avoid violating the priority ceiling of the lock associated with
+      --  this protected object, in Lock_Server. The flag tells Unlock_Server
+      --  or Unlock_And_Update_Server to restore the old priority to
+      --  Old_Base_Priority. This is needed because of situations (bad
+      --  language design?) where one needs to lock a PO but to do so would
+      --  violate the priority ceiling. For example, this can happen when an
+      --  entry call has been requeued to a lower-priority object, and the
+      --  caller then tries to cancel the call while its own priority is
+      --  higher than the ceiling of the new PO.
+
+      Finalized : Boolean := False;
+      --  Set to True by Finalize to make this routine idempotent
+
+      Entry_Bodies : Protected_Entry_Body_Access;
+      --  Pointer to an array containing the executable code for all entry
+      --  bodies of a protected type.
+
+      Find_Body_Index : Find_Body_Index_Access;
+      --  A function which maps the entry index in a call (which denotes the
+      --  queue of the proper entry) into the body of the entry.
+
+      Entry_Queues : Protected_Entry_Queue_Array (1 .. Num_Entries);
+
+      Entry_Names : Entry_Names_Array_Access := null;
+      --  An array of string names which denotes entry [family member] names.
+      --  The structure is indexed by protected entry index and contains Num_
+      --  Entries components.
+   end record;
+
+   --  No default initial values for this type, since call records
+   --  will need to be re-initialized before every use.
+
+   type Protection_Entries_Access is access all Protection_Entries'Class;
+   --  See comments in s-tassta.adb about the implicit call to Current_Master
+   --  generated by this declaration.
+
+   function To_Address is
+     new Ada.Unchecked_Conversion (Protection_Entries_Access, System.Address);
+   function To_Protection is
+     new Ada.Unchecked_Conversion (System.Address, Protection_Entries_Access);
+
+   function Get_Ceiling
+     (Object : Protection_Entries_Access) return System.Any_Priority;
+   --  Returns the new ceiling priority of the protected object
+
+   function Has_Interrupt_Or_Attach_Handler
+     (Object : Protection_Entries_Access) return Boolean;
+   --  Returns True if an Interrupt_Handler or Attach_Handler pragma applies
+   --  to the protected object. That is to say this primitive returns False for
+   --  Protection, but is overridden to return True when interrupt handlers are
+   --  declared so the check required by C.3.1(11) can be implemented in
+   --  System.Tasking.Protected_Objects.Initialize_Protection.
+
+   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;
+      Build_Entry_Names : Boolean);
+   --  Initialize the Object parameter so that it can be used by the runtime
+   --  to keep track of the runtime state of a protected object.
+
+   procedure Lock_Entries (Object : Protection_Entries_Access);
+   --  Lock a protected object for write access. Upon return, the caller owns
+   --  the lock to this object, and no other call to Lock or Lock_Read_Only
+   --  with the same argument will return until the corresponding call to
+   --  Unlock has been made by the caller. Program_Error is raised in case of
+   --  ceiling violation.
+
+   procedure Lock_Entries
+     (Object            : Protection_Entries_Access;
+      Ceiling_Violation : out Boolean);
+   --  Same as above, but return the ceiling violation status instead of
+   --  raising Program_Error.
+
+   procedure Lock_Read_Only_Entries (Object : Protection_Entries_Access);
+   --  Lock a protected object for read access. Upon return, the caller owns
+   --  the lock for read access, and no other calls to Lock with the same
+   --  argument will return until the corresponding call to Unlock has been
+   --  made by the caller. Other calls to Lock_Read_Only may (but need not)
+   --  return before the call to Unlock, and the corresponding callers will
+   --  also own the lock for read access.
+   --
+   --  Note: we are not currently using this interface, it is provided for
+   --  possible future use. At the current time, everyone uses Lock for both
+   --  read and write locks.
+
+   procedure Set_Ceiling
+     (Object : Protection_Entries_Access;
+      Prio   : System.Any_Priority);
+   --  Sets the new ceiling priority of the protected object
+
+   procedure Set_Entry_Name
+     (Object : Protection_Entries'Class;
+      Pos    : Protected_Entry_Index;
+      Val    : String_Access);
+   --  This is called by the compiler to map a string which denotes an entry
+   --  name to a protected entry index.
+
+   procedure Unlock_Entries (Object : Protection_Entries_Access);
+   --  Relinquish ownership of the lock for the object represented by the
+   --  Object parameter. If this ownership was for write access, or if it was
+   --  for read access where there are no other read access locks outstanding,
+   --  one (or more, in the case of Lock_Read_Only) of the tasks waiting on
+   --  this lock (if any) will be given the lock and allowed to return from
+   --  the Lock or Lock_Read_Only call.
+
+private
+
+   overriding procedure Finalize (Object : in out Protection_Entries);
+   --  Clean up a Protection object; in particular, finalize the associated
+   --  Lock object.
+
+end System.Tasking.Protected_Objects.Entries;