diff options
| author | Yang Tse <yangsita@gmail.com> | 2011-11-25 13:51:55 +0100 |
|---|---|---|
| committer | Yang Tse <yangsita@gmail.com> | 2011-11-25 13:51:55 +0100 |
| commit | 97d7a9260e4f2f335b3632180877c25e0efdc8e3 (patch) | |
| tree | 41e91cd18bb9bb781a209a7a7edefde116a09528 /src | |
| parent | 4a4d04446da7b11c7c360d18bfd115a573001cde (diff) | |
tvdiff_secs(): sub-zero time difference adjustment
Skip a floating point addition operation when integral part of time difference
is zero. This avoids potential floating point addition rounding problems while
preserving decimal part value.
Diffstat (limited to 'src')
| -rw-r--r-- | src/tool_util.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/src/tool_util.c b/src/tool_util.c index 79c998295..93ab17fd4 100644 --- a/src/tool_util.c +++ b/src/tool_util.c @@ -123,8 +123,11 @@ long tool_tvdiff(struct timeval newer, struct timeval older) */ double tool_tvdiff_secs(struct timeval newer, struct timeval older) { - return (double)(newer.tv_sec-older.tv_sec)+ - (double)(newer.tv_usec-older.tv_usec)/1000000.0; + if(newer.tv_sec != older.tv_sec) + return (double)(newer.tv_sec-older.tv_sec)+ + (double)(newer.tv_usec-older.tv_usec)/1000000.0; + else + return (double)(newer.tv_usec-older.tv_usec)/1000000.0; } /* return the number of seconds in the given input timeval struct */ |