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Refactor Darwin platform unit conversion helpers

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This commit is contained in:
Alexander Momchilov
2021-08-22 10:47:11 -04:00
parent fa48c484cc
commit 59d0c5b26a
4 changed files with 33 additions and 28 deletions
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29
darwin/Platform.c
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@ -120,9 +120,9 @@ const MeterClass* const Platform_meterTypes[] = {
NULL
};
double Platform_timebaseToNS = 1.0;
static double Platform_nanosecondsPerMachTick = 1.0;
long Platform_clockTicksPerSec = -1;
static double Platform_schedulerTicksPerNS = -1;
void Platform_init(void) {
// Check if we can determine the timebase used on this system.
@ -130,18 +130,33 @@ void Platform_init(void) {
#ifdef HAVE_MACH_TIMEBASE_INFO
mach_timebase_info_data_t info;
mach_timebase_info(&info);
Platform_timebaseToNS = (double)info.numer / (double)info.denom;
Platform_nanosecondsPerMachTick = (double)info.numer / (double)info.denom;
#else
Platform_timebaseToNS = 1.0;
Platform_nanosecondsPerMachTick = 1.0;
#endif
// Determine the number of clock ticks per second
// Determine the number of scheduler clock ticks per second
errno = 0;
Platform_clockTicksPerSec = sysconf(_SC_CLK_TCK);
long scheduler_ticks_per_sec = sysconf(_SC_CLK_TCK);
if (errno || Platform_clockTicksPerSec < 1) {
if (errno || scheduler_ticks_per_sec < 1) {
CRT_fatalError("Unable to retrieve clock tick rate");
}
const double nanos_per_sec = 1e9;
Platform_schedulerTicksPerNS = nanos_per_sec / scheduler_ticks_per_sec;
}
// Converts ticks in the Mach "timebase" to nanoseconds.
// See `mach_timebase_info`, as used to define the `Platform_nanosecondsPerMachTick` constant.
uint64_t Platform_machTicksToNanoseconds(uint64_t mach_ticks) {
return (uint64_t) ((double) mach_ticks * Platform_nanosecondsPerMachTick);
}
// Converts "scheduler ticks" to nanoseconds.
// See `sysconf(_SC_CLK_TCK)`, as used to define the `Platform_schedulerTicksPerNS` constant.
double Platform_schedulerTicksToNanoseconds(const double scheduler_ticks) {
return scheduler_ticks * Platform_schedulerTicksPerNS;
}
void Platform_done(void) {