1------------------------------------------------------------------------------ 2-- -- 3-- GNAT LIBRARY COMPONENTS -- 4-- -- 5-- G N A T . S E M A P H O R E S -- 6-- -- 7-- B o d y -- 8-- -- 9-- Copyright (C) 2003 Ada Core Technologies, Inc. -- 10-- -- 11-- GNAT is free software; you can redistribute it and/or modify it under -- 12-- terms of the GNU General Public License as published by the Free Soft- -- 13-- ware Foundation; either version 2, or (at your option) any later ver- -- 14-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- 15-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- 16-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- 17-- for more details. You should have received a copy of the GNU General -- 18-- Public License distributed with GNAT; see file COPYING. If not, write -- 19-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- 20-- MA 02111-1307, USA. -- 21-- -- 22-- As a special exception, if other files instantiate generics from this -- 23-- unit, or you link this unit with other files to produce an executable, -- 24-- this unit does not by itself cause the resulting executable to be -- 25-- covered by the GNU General Public License. This exception does not -- 26-- however invalidate any other reasons why the executable file might be -- 27-- covered by the GNU Public License. -- 28-- -- 29-- GNAT was originally developed by the GNAT team at New York University. -- 30-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). -- 31-- -- 32------------------------------------------------------------------------------ 33 34package body GNAT.Semaphores is 35 36 ------------------------ 37 -- Counting_Semaphore -- 38 ------------------------ 39 40 protected body Counting_Semaphore is 41 42 ----------- 43 -- Seize -- 44 ----------- 45 46 entry Seize when Count > 0 is 47 begin 48 Count := Count - 1; 49 end Seize; 50 51 ------------- 52 -- Release -- 53 ------------- 54 55 procedure Release is 56 begin 57 Count := Count + 1; 58 end Release; 59 end Counting_Semaphore; 60 61 ---------------------- 62 -- Binary_Semaphore -- 63 ---------------------- 64 65 protected body Binary_Semaphore is 66 67 ----------- 68 -- Seize -- 69 ----------- 70 71 entry Seize when Available is 72 begin 73 Available := False; 74 end Seize; 75 76 ------------- 77 -- Release -- 78 ------------- 79 80 procedure Release is 81 begin 82 Available := True; 83 end Release; 84 end Binary_Semaphore; 85 86end GNAT.Semaphores; 87