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author | emellor@leeni.uk.xensource.com <emellor@leeni.uk.xensource.com> | 2006-03-02 21:44:49 +0100 |
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committer | emellor@leeni.uk.xensource.com <emellor@leeni.uk.xensource.com> | 2006-03-02 21:44:49 +0100 |
commit | 186f0e02a1c616a7727b0b2628fd3c443d145f72 (patch) | |
tree | 3fec115a674bf3fc9e3260700d2ba50124b7b45a /tools/xenstore/hashtable_private.h | |
parent | b7c853b0bac7ea75657223d8782473a7e105d47c (diff) | |
download | xen-186f0e02a1c616a7727b0b2628fd3c443d145f72.tar.gz xen-186f0e02a1c616a7727b0b2628fd3c443d145f72.tar.bz2 xen-186f0e02a1c616a7727b0b2628fd3c443d145f72.zip |
Added hashtable implementation, to support the reachability check against the
store. This code is by Christopher Clark.
Signed-off-by: Ewan Mellor <ewan@xensource.com>
Diffstat (limited to 'tools/xenstore/hashtable_private.h')
-rw-r--r-- | tools/xenstore/hashtable_private.h | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/tools/xenstore/hashtable_private.h b/tools/xenstore/hashtable_private.h new file mode 100644 index 0000000000..3e95f60057 --- /dev/null +++ b/tools/xenstore/hashtable_private.h @@ -0,0 +1,85 @@ +/* Copyright (C) 2002, 2004 Christopher Clark <firstname.lastname@cl.cam.ac.uk> */ + +#ifndef __HASHTABLE_PRIVATE_CWC22_H__ +#define __HASHTABLE_PRIVATE_CWC22_H__ + +#include "hashtable.h" + +/*****************************************************************************/ +struct entry +{ + void *k, *v; + unsigned int h; + struct entry *next; +}; + +struct hashtable { + unsigned int tablelength; + struct entry **table; + unsigned int entrycount; + unsigned int loadlimit; + unsigned int primeindex; + unsigned int (*hashfn) (void *k); + int (*eqfn) (void *k1, void *k2); +}; + +/*****************************************************************************/ +unsigned int +hash(struct hashtable *h, void *k); + +/*****************************************************************************/ +/* indexFor */ +static inline unsigned int +indexFor(unsigned int tablelength, unsigned int hashvalue) { + return (hashvalue % tablelength); +}; + +/* Only works if tablelength == 2^N */ +/*static inline unsigned int +indexFor(unsigned int tablelength, unsigned int hashvalue) +{ + return (hashvalue & (tablelength - 1u)); +} +*/ + +/*****************************************************************************/ +#define freekey(X) free(X) +/*define freekey(X) ; */ + + +/*****************************************************************************/ + +#endif /* __HASHTABLE_PRIVATE_CWC22_H__*/ + +/* + * Copyright (c) 2002, Christopher Clark + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * * Neither the name of the original author; nor the names of any contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER + * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +*/ |