| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT LIBRARY COMPONENTS -- |
| -- -- |
| -- G N A T . S E M A P H O R E S -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 2003 Ada Core Technologies, Inc. -- |
| -- -- |
| -- 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- -- |
| -- 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. -- |
| -- -- |
| -- 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. -- |
| -- -- |
| -- 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 body GNAT.Semaphores is |
| |
| ------------------------ |
| -- Counting_Semaphore -- |
| ------------------------ |
| |
| protected body Counting_Semaphore is |
| |
| ----------- |
| -- Seize -- |
| ----------- |
| |
| entry Seize when Count > 0 is |
| begin |
| Count := Count - 1; |
| end Seize; |
| |
| ------------- |
| -- Release -- |
| ------------- |
| |
| procedure Release is |
| begin |
| Count := Count + 1; |
| end Release; |
| end Counting_Semaphore; |
| |
| ---------------------- |
| -- Binary_Semaphore -- |
| ---------------------- |
| |
| protected body Binary_Semaphore is |
| |
| ----------- |
| -- Seize -- |
| ----------- |
| |
| entry Seize when Available is |
| begin |
| Available := False; |
| end Seize; |
| |
| ------------- |
| -- Release -- |
| ------------- |
| |
| procedure Release is |
| begin |
| Available := True; |
| end Release; |
| end Binary_Semaphore; |
| |
| end GNAT.Semaphores; |
