Commit ece21ea0 authored by Duncan Coutts's avatar Duncan Coutts
Browse files

Add rts time util getUnixEpochTime

The other existing time utilities give us time elapsed since process
or thread start. This is for wall clock time, using the common Unix
epoch interpretation.
parent 17c16623
......@@ -22,6 +22,11 @@ Ticks getThreadCPUTime (void);
Ticks getProcessElapsedTime (void);
void getProcessTimes (Ticks *user, Ticks *elapsed);
/* Get the current date and time.
Uses seconds since the Unix epoch, plus nanoseconds
void getUnixEpochTime (StgWord64 *sec, StgWord32 *nsec);
// Not strictly timing, but related
nat getPageFaults (void);
......@@ -181,6 +181,22 @@ Ticks getThreadCPUTime(void)
return getProcessCPUTime();
void getUnixEpochTime(StgWord64 *sec, StgWord32 *nsec)
struct timeval tv;
gettimeofday(&tv, (struct timezone *) NULL);
*sec = tv.tv_sec;
*nsec = tv.tv_usec * 1000;
/* Sigh, fall back to second resolution. */
time_t t;
*sec = t;
*nsec = 0;
......@@ -92,6 +92,46 @@ getThreadCPUTime(void)
return fileTimeToTicks(userTime);
getUnixEpochTime(StgWord64 *sec, StgWord32 *nsec)
/* Windows has a bunch of time APIs but none that directly give
us unix epoch time, so we have to do a little dance. */
FILETIME filetime;
/* Windows SYSTEMTIME is a big struct with fields for
year, month, day, hour, minute, second, millisecond. */
/* Windows FILETIME timestamps use an epoch-based time,
using a 64bit unsigned word. The time is measured in
units of 100 nanoseconds since an epoch of 1601. */
SystemTimeToFileTime(&systime, &filetime);
/* FILETIME isn't directly a 64bit word, but a struct with
a pair of 32bit words, so we have to convert via a
ULARGE_INTEGER struct which is a handy union type */
unixtime.LowPart = filetime.dwLowDateTime;
unixtime.HighPart = filetime.dwHighDateTime;
/* We have to do an epoch conversion, since FILETIME uses 1601
while we want unix epoch of 1970. In case you were wondering,
there were 11,644,473,600 seconds between 1601 and 1970, then
multiply by 10^7 for units of 100 nanoseconds. */
unixtime.QuadPart = unixtime.QuadPart - 116444736000000000ull;
/* For the seconds part we use integer division by 10^7 */
*sec = unixtime.QuadPart / 10000000ull;
/* The remainder from integer division by 10^7 gives us
the sub-second component in units of 100 nanoseconds.
So for nanoseconds we just multiply by 100.
Note that nanoseconds always fits in a 32bit word */
*nsec = ((unsigned long)(unixtime.QuadPart % 10000000ull)) * 100ul;
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