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) 2003-2010, AdaCore -- 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 3, 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. -- 17-- -- 18-- As a special exception under Section 7 of GPL version 3, you are granted -- 19-- additional permissions described in the GCC Runtime Library Exception, -- 20-- version 3.1, as published by the Free Software Foundation. -- 21-- -- 22-- You should have received a copy of the GNU General Public License and -- 23-- a copy of the GCC Runtime Library Exception along with this program; -- 24-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- 25-- <http://www.gnu.org/licenses/>. -- 26-- -- 27-- GNAT was originally developed by the GNAT team at New York University. -- 28-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). -- 29-- -- 30------------------------------------------------------------------------------ 31 32package body GNAT.Semaphores is 33 34 ------------------------ 35 -- Counting_Semaphore -- 36 ------------------------ 37 38 protected body Counting_Semaphore is 39 40 ----------- 41 -- Seize -- 42 ----------- 43 44 entry Seize when Count > 0 is 45 begin 46 Count := Count - 1; 47 end Seize; 48 49 ------------- 50 -- Release -- 51 ------------- 52 53 procedure Release is 54 begin 55 Count := Count + 1; 56 end Release; 57 end Counting_Semaphore; 58 59 ---------------------- 60 -- Binary_Semaphore -- 61 ---------------------- 62 63 protected body Binary_Semaphore is 64 65 ----------- 66 -- Seize -- 67 ----------- 68 69 entry Seize when Available is 70 begin 71 Available := False; 72 end Seize; 73 74 ------------- 75 -- Release -- 76 ------------- 77 78 procedure Release is 79 begin 80 Available := True; 81 end Release; 82 end Binary_Semaphore; 83 84end GNAT.Semaphores; 85