diff options
Diffstat (limited to 'src/port/gettimeofday.c')
| -rw-r--r-- | src/port/gettimeofday.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/src/port/gettimeofday.c b/src/port/gettimeofday.c index 75a91993b74..ecc0b4dd704 100644 --- a/src/port/gettimeofday.c +++ b/src/port/gettimeofday.c @@ -31,10 +31,17 @@ #include <sys/time.h> -/* FILETIME of Jan 1 1970 00:00:00. */ +/* FILETIME of Jan 1 1970 00:00:00, the PostgreSQL epoch */ static const unsigned __int64 epoch = UINT64CONST(116444736000000000); /* + * FILETIME represents the number of 100-nanosecond intervals since + * January 1, 1601 (UTC). + */ +#define FILETIME_UNITS_PER_SEC 10000000L +#define FILETIME_UNITS_PER_USEC 10 + +/* * timezone information is stored outside the kernel so tzp isn't used anymore. * * Note: this function is not for Win32 high precision timing purpose. See @@ -44,16 +51,15 @@ int gettimeofday(struct timeval * tp, struct timezone * tzp) { FILETIME file_time; - SYSTEMTIME system_time; ULARGE_INTEGER ularge; - GetSystemTime(&system_time); - SystemTimeToFileTime(&system_time, &file_time); + GetSystemTimeAsFileTime(&file_time); ularge.LowPart = file_time.dwLowDateTime; ularge.HighPart = file_time.dwHighDateTime; - tp->tv_sec = (long) ((ularge.QuadPart - epoch) / 10000000L); - tp->tv_usec = (long) (system_time.wMilliseconds * 1000); + tp->tv_sec = (long) ((ularge.QuadPart - epoch) / FILETIME_UNITS_PER_SEC); + tp->tv_usec = (long) (((ularge.QuadPart - epoch) % FILETIME_UNITS_PER_SEC) + / FILETIME_UNITS_PER_USEC); return 0; } |