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/*-
* Copyright (c) 2014-2016 MongoDB, Inc.
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
static inline int __wt_log_cmp(WT_LSN *lsn1, WT_LSN *lsn2);
/*
* __wt_log_cmp --
* Compare 2 LSNs, return -1 if lsn1 < lsn2, 0if lsn1 == lsn2
* and 1 if lsn1 > lsn2.
*/
static inline int
__wt_log_cmp(WT_LSN *lsn1, WT_LSN *lsn2)
{
WT_LSN l1, l2;
/*
* Read LSNs into local variables so that we only read each field
* once and all comparisons are on the same values.
*/
l1 = *(volatile WT_LSN *)lsn1;
l2 = *(volatile WT_LSN *)lsn2;
/*
* If the file numbers are different we don't need to compare the
* offset.
*/
if (l1.file != l2.file)
return (l1.file < l2.file ? -1 : 1);
/*
* If the file numbers are the same, compare the offset.
*/
if (l1.offset != l2.offset)
return (l1.offset < l2.offset ? -1 : 1);
return (0);
}
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