| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT LIBRARY COMPONENTS -- |
| -- -- |
| -- G N A T . S E M A P H O R E S -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 2003-2022, 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 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. -- |
| -- -- |
| -- 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 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; |
