diff options
Diffstat (limited to 'lib/isc/include/isc/symtab.h')
| -rw-r--r-- | lib/isc/include/isc/symtab.h | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/lib/isc/include/isc/symtab.h b/lib/isc/include/isc/symtab.h index 396d64539607..9d0e5e2f23f0 100644 --- a/lib/isc/include/isc/symtab.h +++ b/lib/isc/include/isc/symtab.h @@ -1,5 +1,5 @@ /* - * Copyright (C) 2004-2007, 2009 Internet Systems Consortium, Inc. ("ISC") + * Copyright (C) 2004-2007, 2009, 2011, 2012 Internet Systems Consortium, Inc. ("ISC") * Copyright (C) 1996-2001 Internet Software Consortium. * * Permission to use, copy, modify, and/or distribute this software for any @@ -15,7 +15,7 @@ * PERFORMANCE OF THIS SOFTWARE. */ -/* $Id: symtab.h,v 1.24.332.2 2009/01/18 23:47:41 tbox Exp $ */ +/* $Id$ */ #ifndef ISC_SYMTAB_H #define ISC_SYMTAB_H 1 @@ -57,6 +57,14 @@ * undefined. It can be used to free memory associated with keys and/or * values. * + * A symbol table is implemented as a hash table of lists; the size of the + * hash table is set by the 'size' parameter to isc_symtbl_create(). When + * the number of entries in the symbol table reaches three quarters of this + * value, the hash table is reallocated with size doubled, in order to + * optimize lookup performance. This has a negative effect on insertion + * performance, which can be mitigated by sizing the table appropriately + * when creating it. + * * \li MP: * The callers of this module must ensure any required synchronization. * |