From 3950ffe2a485479f6561c27364d3d7df5a21d124 Mon Sep 17 00:00:00 2001 From: Igor Pashev Date: Sun, 24 Jun 2012 22:28:35 +0000 Subject: Imported Upstream version 93u+ --- src/lib/libast/astsa/aso.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) create mode 100644 src/lib/libast/astsa/aso.c (limited to 'src/lib/libast/astsa/aso.c') diff --git a/src/lib/libast/astsa/aso.c b/src/lib/libast/astsa/aso.c new file mode 100644 index 0000000..3b2226d --- /dev/null +++ b/src/lib/libast/astsa/aso.c @@ -0,0 +1,56 @@ +/*********************************************************************** +* * +* This software is part of the ast package * +* Copyright (c) 1985-2012 AT&T Intellectual Property * +* and is licensed under the * +* Eclipse Public License, Version 1.0 * +* by AT&T Intellectual Property * +* * +* A copy of the License is available at * +* http://www.eclipse.org/org/documents/epl-v10.html * +* (with md5 checksum b35adb5213ca9657e911e9befb180842) * +* * +* Information and Software Systems Research * +* AT&T Research * +* Florham Park NJ * +* * +* Glenn Fowler * +* David Korn * +* Phong Vo * +* * +***********************************************************************/ +#pragma prototyped + +#include + +int +asolock(unsigned int volatile* lock, unsigned int key, int type) +{ + unsigned int k; + + if (key) + switch (type) + { + case ASO_UNLOCK: + if (*lock != 0) + { + if (*lock != key) + return -1; + *lock = 0; + } + return 0; + case ASO_TRYLOCK: + if (*lock != key) + { + if (*lock != 0) + return -1; + *lock = key; + } + return 0; + case ASO_LOCK: + case ASO_SPINLOCK: + *lock = key; + return 0; + } + return -1; +} -- cgit v1.2.3