------------------------------------------------------------------------------
-- --
--- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
+-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
-- --
--- SYSTEM.TASKING.PROTECTED_OBJECTS.SINGLE_ENTRY --
+-- SYSTEM.TASKING.PROTECTED_OBJECTS.SINGLE_ENTRY --
-- --
-- S p e c --
-- --
--- Copyright (C) 1992-2004 Free Software Foundation, Inc. --
+-- 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 2, or (at your option) any later ver- --
--- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
+-- 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. 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. --
+-- or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
--- 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. --
+-- 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 provides an optimized version of Protected_Objects.Operations
-- and Protected_Objects.Entries making the following assumptions:
--
--- PO have only one entry
--- There is only one caller at a time (No_Entry_Queue)
--- There is no dynamic priority support (No_Dynamic_Priorities)
--- No Abort Statements
--- (No_Abort_Statements, Max_Asynchronous_Select_Nesting => 0)
--- PO are at library level
--- None of the tasks will terminate (no need for finalization)
+-- PO have only one entry
+-- There is only one caller at a time (No_Entry_Queue)
+-- There is no dynamic priority support (No_Dynamic_Priorities)
+-- No Abort Statements
+-- (No_Abort_Statements, Max_Asynchronous_Select_Nesting => 0)
+-- PO are at library level
+-- None of the tasks will terminate (no need for finalization)
--
-- This interface is intended to be used in the ravenscar profile, the
-- compiler is responsible for ensuring that the conditions mentioned above
-- 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 cals to Lock_Read_Only
+ -- 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.
function Protected_Count_Entry (Object : Protection_Entry)
return Natural;
- -- Return the number of entry calls on Object (0 or 1).
+ -- Return the number of entry calls on Object (0 or 1)
function Protected_Single_Entry_Caller (Object : Protection_Entry)
return Task_Id;
private
type Protection_Entry is record
- L : aliased Task_Primitives.Lock;
- Compiler_Info : System.Address;
- Call_In_Progress : Entry_Call_Link;
- Ceiling : System.Any_Priority;
- Entry_Body : Entry_Body_Access;
- Entry_Queue : Entry_Call_Link;
+ Common : aliased Protection;
+ -- State of the protected object. This part is common to any protected
+ -- object, including those without 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)
+
+ Entry_Body : Entry_Body_Access;
+ -- Pointer to executable code for the entry body of the protected type
+
+ Entry_Queue : Entry_Call_Link;
+ -- Place to store the waiting entry call (if any)
end record;
end System.Tasking.Protected_Objects.Single_Entry;
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