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Unhardcode tick-to-ms conversion

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Division by 100000.0 worked because `sysconf(_SC_CLK_TCK)` happened to be 100.

By unhardcoding:

1) It becomes more clear what this 100000.0 figure comes from.
2) It protects against bugs in the case `sysconf(_SC_CLK_TCK)` ever changes.
This commit is contained in:
Alexander Momchilov
2020-12-08 23:12:44 -05:00
committed by cgzones
parent f614b8a19f
commit 67ccd6b909
5 changed files with 35 additions and 15 deletions
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16
darwin/Platform.c
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@ -10,16 +10,18 @@ in the source distribution for its full text.
#include "Platform.h"
#include <errno.h>
#include <math.h>
#include <stdlib.h>
#include <CoreFoundation/CoreFoundation.h>
#include <unistd.h>
#include <CoreFoundation/CFString.h>
#include <CoreFoundation/CoreFoundation.h>
#include <IOKit/ps/IOPowerSources.h>
#include <IOKit/ps/IOPSKeys.h>
#include "ClockMeter.h"
#include "CPUMeter.h"
#include "CRT.h"
#include "DarwinProcessList.h"
#include "DateMeter.h"
#include "DateTimeMeter.h"
@ -112,6 +114,8 @@ const MeterClass* const Platform_meterTypes[] = {
double Platform_timebaseToNS = 1.0;
long Platform_clockTicksPerSec = -1;
void Platform_init(void) {
// Check if we can determine the timebase used on this system.
// If the API is unavailable assume we get our timebase in nanoseconds.
@ -122,6 +126,14 @@ void Platform_init(void) {
#else
Platform_timebaseToNS = 1.0;
#endif
// Determine the number of clock ticks per second
errno = 0;
Platform_clockTicksPerSec = sysconf(_SC_CLK_TCK);
if (errno || Platform_clockTicksPerSec < 1) {
CRT_fatalError("Unable to retrieve clock tick rate");
}
}
void Platform_done(void) {