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| author | Igor Pashev <pashev.igor@gmail.com> | 2012-06-24 22:28:35 +0000 |
|---|---|---|
| committer | Igor Pashev <pashev.igor@gmail.com> | 2012-06-24 22:28:35 +0000 |
| commit | 3950ffe2a485479f6561c27364d3d7df5a21d124 (patch) | |
| tree | 468c6e14449d1b1e279222ec32f676b0311917d2 /src/lib/libast/astsa/aso.c | |
| download | ksh-upstream.tar.gz | |
Imported Upstream version 93u+upstream
Diffstat (limited to 'src/lib/libast/astsa/aso.c')
| -rw-r--r-- | src/lib/libast/astsa/aso.c | 56 |
1 files changed, 56 insertions, 0 deletions
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 <gsf@research.att.com> * +* David Korn <dgk@research.att.com> * +* Phong Vo <kpv@research.att.com> * +* * +***********************************************************************/ +#pragma prototyped + +#include <aso.h> + +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; +} |