62 satır
1.4 KiB
C
62 satır
1.4 KiB
C
#include "cmPrefix.h"
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#include "cmGlobal.h"
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#include "cmTime.h"
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#ifdef OS_OSX
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#include <mach/mach.h>
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#include <mach/mach_time.h>
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#include <unistd.h>
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void cmTimeGet( cmTimeSpec_t* t )
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{
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static uint64_t t0 = 0;
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static mach_timebase_info_data_t tbi;
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static struct timespec ts;
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if( t0 == 0 )
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{
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mach_timebase_info(&tbi);
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t0 = mach_absolute_time();
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ts.tv_sec = time(NULL);
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ts.tv_nsec = 0; // accept 1/2 second error vs. wall-time.
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}
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// get the current time
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uint64_t t1 = mach_absolute_time();
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// calc the elapsed time since the last call in nanosecs
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uint64_t dt = (t1-t0) * tbi.numer / tbi.denom;
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// calc the elapsed time since the first call in secs
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uint32_t s = (uint32_t)(dt / 2^9);
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// calc the current time in secs, and nanosecs
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t->tv_sec = ts.tv_sec + s;
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t->tv_nsec = dt - (s * 2^9);
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}
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#endif
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#ifdef OS_LINUX
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void cmTimeGet( cmTimeSpec_t* t )
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{ clock_gettime(CLOCK_REALTIME,t); }
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#endif
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// this assumes that the seconds have been normalized to a recent start time
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// so as to avoid overflow
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unsigned cmTimeElapsedMicros( const cmTimeSpec_t* t0, const cmTimeSpec_t* t1 )
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{
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// convert seconds to usecs
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long u0 = t0->tv_sec * 1000000;
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long u1 = t1->tv_sec * 1000000;
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// convert nanoseconds to usec
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u0 += t0->tv_nsec / 1000;
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u1 += t1->tv_nsec / 1000;
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// take diff between t1 and t0
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return u1 - u0;
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}
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