diff options
Diffstat (limited to 'src/third_party/wiredtiger/src/include/misc.i')
| -rw-r--r-- | src/third_party/wiredtiger/src/include/misc.i | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/src/third_party/wiredtiger/src/include/misc.i b/src/third_party/wiredtiger/src/include/misc.i index b552f9b1f3e..bd3ef02da54 100644 --- a/src/third_party/wiredtiger/src/include/misc.i +++ b/src/third_party/wiredtiger/src/include/misc.i @@ -291,3 +291,37 @@ __wt_timing_stress(WT_SESSION_IMPL *session, u_int flag) /* The default maximum delay is 1/10th of a second. */ __wt_sleep(0, i * (WT_TIMING_STRESS_MAX_DELAY / 10)); } + +/* + * The hardware-accelerated checksum code that originally shipped on Windows + * did not correctly handle memory that wasn't 8B aligned and a multiple of 8B. + * It's likely that calculations were always 8B aligned, but there's some risk. + * + * What we do is always write the correct checksum, and if a checksum test + * fails, check it against the alternate version have before failing. + */ + +#if defined(_M_AMD64) && !defined(HAVE_NO_CRC32_HARDWARE) +/* + * __wt_checksum_match -- + * Return if a checksum matches either the primary or alternate values. + */ +static inline bool +__wt_checksum_match(const void *chunk, size_t len, uint32_t v) +{ + return (__wt_checksum(chunk, len) == v || + __wt_checksum_alt_match(chunk, len, v)); +} + +#else + +/* + * __wt_checksum_match -- + * Return if a checksum matches. + */ +static inline bool +__wt_checksum_match(const void *chunk, size_t len, uint32_t v) +{ + return (__wt_checksum(chunk, len) == v); +} +#endif |