-- --
-- S p e c --
-- --
--- Copyright (C) 2003 Ada Core Technologies, Inc. --
+-- Copyright (C) 2003-2010, AdaCore --
-- --
-- GNAT 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- --
+-- 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 GNAT; 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/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
package GNAT.Semaphores is
Default_Ceiling : constant System.Priority := System.Default_Priority;
- -- A convenient value for the priority discriminants that follow.
+ -- A convenient value for the priority discriminants that follow
------------------------
-- Counting_Semaphore --
-- value of this counter is set by clients via the discriminant.
Ceiling : System.Priority)
- -- Users must specify the ceiling priority for the object.
- -- If the Real-Time Systems Annex is not in use this value
- -- is not important.
+ -- Users must specify the ceiling priority for the object. If the
+ -- Real-Time Systems Annex is not in use this value is not important.
is
pragma Priority (Ceiling);
entry Seize;
- -- Blocks caller until/unless the semaphore's internal counter
- -- is greater than zero.
- -- Decrements the semaphore's internal counter when executed.
+ -- Blocks caller until/unless the semaphore's internal counter is
+ -- greater than zero. Decrements the semaphore's internal counter when
+ -- executed.
procedure Release;
- -- Increments the semaphore's internal counter.
+ -- Increments the semaphore's internal counter
private
Count : Natural := Initial_Value;
----------------------
protected type Binary_Semaphore
- (Initially_Available : Boolean;
- -- Binary semaphores are either available or not; there is no
- -- internal count involved. The discriminant value determines
- -- whether the individual object is initially available.
+ (Initially_Available : Boolean;
+ -- Binary semaphores are either available or not; there is no internal
+ -- count involved. The discriminant value determines whether the
+ -- individual object is initially available.
+
Ceiling : System.Priority)
- -- Users must specify the ceiling priority for the object.
- -- If the Real-Time Systems Annex is not in use
- -- this value is not important.
+ -- Users must specify the ceiling priority for the object. If the
+ -- Real-Time Systems Annex is not in use this value is not important.
is
pragma Priority (Ceiling);
entry Seize;
- -- Blocks the caller unless/until semaphore is available.
- -- After execution the semaphore is no longer available.
+ -- Blocks the caller unless/until semaphore is available. After
+ -- execution the semaphore is no longer available.
procedure Release;
- -- Makes the semaphore available.
+ -- Makes the semaphore available
private
Available : Boolean := Initially_Available;
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