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epicsThreadPerform: time epicsThreadOnce()

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This commit is contained in:
Michael Davidsaver
2023-01-09 13:14:47 -08:00
parent bdaca51d96
commit 625c2ef159
1 changed files with 37 additions and 0 deletions
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37
modules/libcom/test/epicsThreadPerform.cpp
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@@ -216,6 +216,42 @@ static void timeEpicsThreadPrivateGet ()
printf("epicsThreadPrivateGet() takes %f microseconds\n", delay);
}
static void onceAction(void*) {}
static void timeOnce ()
{
#define NITER 100
epicsThreadOnceId once[NITER];
double tSlow = 0.0, tFast = 0.0,
tSlow2= 0.0, tFast2= 0.0;
unsigned i;
for(i=0; i<NITER; i++) {
epicsUInt64 t0, t1, t2;
once[i] = EPICS_THREAD_ONCE_INIT;
t0 = epicsMonotonicGet();
epicsThreadOnce(&once[i], &onceAction, NULL);
t1 = epicsMonotonicGet();
epicsThreadOnce(&once[i], &onceAction, NULL);
t2 = epicsMonotonicGet();
tSlow += t1 - t0;
tSlow2 += (t1 - t0)*(t1 - t0);
tFast += t2 - t1;
tFast2 += (t2 - t1)*(t2 - t1);
}
tSlow /= NITER;
tSlow2 /= NITER;
tFast /= NITER;
tFast2 /= NITER;
printf("epicsThreadOnce(), slow path %.0f +- %.0f ns, fast path %.0f +- %.0f ns\n",
tSlow, sqrt(tSlow2 - tSlow*tSlow),
tFast, sqrt(tFast2 - tFast*tFast));
#undef NITER
}
MAIN(epicsThreadPerform)
{
@@ -224,5 +260,6 @@ MAIN(epicsThreadPerform)
threadSleepTest ();
epicsThreadGetIdSelfPerfTest ();
timeEpicsThreadPrivateGet ();
timeOnce ();
return 0;
}