File: timing.h

package info (click to toggle)
llvm-toolchain-19 1%3A19.1.7-10.1
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid
  • size: 1,999,140 kB
  • sloc: cpp: 6,951,711; ansic: 1,486,157; asm: 913,598; python: 232,024; f90: 80,126; objc: 75,281; lisp: 37,276; pascal: 16,990; sh: 10,033; ml: 5,058; perl: 4,724; awk: 3,523; makefile: 3,252; javascript: 2,504; xml: 892; fortran: 664; cs: 573
file content (28 lines) | stat: -rw-r--r-- 654 bytes parent folder | download | duplicates (48) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
 
#include <mach/mach_time.h>
#include <stdint.h>
#include <stdlib.h>

double intervalInCycles( uint64_t startTime, uint64_t endTime )
{
	uint64_t rawTime = endTime - startTime;
	static double conversion = 0.0;
	
	if( 0.0 == conversion )
	{
		mach_timebase_info_data_t	info;
		kern_return_t err = mach_timebase_info( &info );
		if( 0 != err )
			return 0;
		
		uint64_t freq = 0;
		size_t freqSize = sizeof( freq );
		int err2 = sysctlbyname( "hw.cpufrequency", &freq, &freqSize, NULL, 0L );
		if( 0 != err2 )
			return 0;
		
		conversion = (double) freq * (1e-9 * (double) info.numer / (double) info.denom);
	}
	
	return (double) rawTime * conversion;
}