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Diffstat (limited to 'gcc/ada/g-semaph.adb')
| -rw-r--r-- | gcc/ada/g-semaph.adb | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/gcc/ada/g-semaph.adb b/gcc/ada/g-semaph.adb new file mode 100644 index 00000000000..812cf192f93 --- /dev/null +++ b/gcc/ada/g-semaph.adb @@ -0,0 +1,86 @@ +------------------------------------------------------------------------------ +-- -- +-- 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; |