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express: Use monotonic clock on POSIX (has nanosecond precision)

This commit is contained in:
rdb 2025-01-22 22:14:24 +01:00
parent 674fa4480b
commit da4e2cad9f
1 changed files with 17 additions and 18 deletions
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35
panda/src/express/trueClock.cxx
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@ -521,6 +521,7 @@ TrueClock() {
#include <stdio.h> // for perror
static long _init_sec;
static time_t _init_sec_monotonic = 0;
/**
*
@ -553,25 +554,13 @@ get_long_time() {
*/
double TrueClock::
get_short_raw_time() {
struct timeval tv;
int result;
#ifdef GETTIMEOFDAY_ONE_PARAM
result = gettimeofday(&tv);
#else
result = gettimeofday(&tv, nullptr);
#endif
if (result < 0) {
// Error in gettimeofday().
return 0.0;
#if defined(CLOCK_MONOTONIC) && !defined(__APPLE__)
struct timespec spec;
if (clock_gettime(CLOCK_MONOTONIC, &spec) == 0) {
return (double)(spec.tv_sec - _init_sec_monotonic) + (double)spec.tv_nsec / 1000000000.0;
}
// We subtract out the time at which the clock was initialized, because we
// don't care about the number of seconds all the way back to 1970, and we
// want to leave the double with as much precision as it can get.
return (double)(tv.tv_sec - _init_sec) + (double)tv.tv_usec / 1000000.0;
#endif
return get_long_time();
}
/**
@ -603,6 +592,16 @@ TrueClock() {
} else {
_init_sec = tv.tv_sec;
}
#if defined(CLOCK_MONOTONIC) && !defined(__APPLE__)
struct timespec spec;
if (clock_gettime(CLOCK_MONOTONIC, &spec) == 0) {
_init_sec_monotonic = spec.tv_sec;
} else {
perror("clock_gettime(CLOCK_MONOTONIC)");
_init_sec_monotonic = 0;
}
#endif
}
#endif