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#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <stdint.h>
#include <inttypes.h>
#include "../../src/util/error.h"
#include "../../src/util/memory.h"
#include "../../src/util/timer.h"
static int err;
// Quite short delay corresponding to 20 Hz.
#define DELAY_MS 50
/**
* Test timer against the sleep() function on a short delay. Measured delay
* should be close to the issued delay time.
*/
static void testSleep()
{
timer_Type *t = timer_new();
timer_start(t);
timer_sleepMilliseconds(DELAY_MS);
timer_stop(t);
int ms = timer_getElapsedMilliseconds(t);
int64_t us = timer_getElapsedMicroseconds(t);
int64_t ns = timer_getElapsedNanoseconds(t);
// The time module should round ns to get ms and us -- check:
if( !(ms == (ns + 500000)/1000000 && us == (ns + 500)/1000) ){
err++;
printf("ERROR: timings units mismatch, bad rounding:"
" %d ms, %" PRId64 " us, %" PRId64 " ns\n",
ms, us, ns);
}
int delta = ms - DELAY_MS;
if( !(-5 <= delta && delta <= 10) ){
err++;
printf("ERROR timing the 'sleep' function: expected %d ms, got %d ms (%+d ms)\n",
DELAY_MS, ms, delta);
printf("This may happen if the system is busy -- check for running processes and try again.\n");
}
memory_dispose(t);
};
#define granularity_N 100
/**
* Check timer granularity better than 1 ms.
*/
static void testGranularity()
{
timer_Type *t = timer_new();
int i, min, max, sum = 0;
for(i = 0; i < granularity_N; i++){
// Get a sample of the smaller detectable time interval:
timer_reset(t);
timer_start(t);
int64_t dt_ns = 0;
do {
dt_ns = timer_getElapsedNanoseconds(t);
} while(dt_ns <= 0);
// Update the statistics:
sum += dt_ns;
if( i == 0 ){
min = max = dt_ns;
} else if( dt_ns < min ){
min = dt_ns;
} else if( dt_ns > max ){
max = dt_ns;
}
}
if( max >= 1000000 ){
err++;
printf("ERROR: coarse timer granularity detected on %d samples: min=%d ns, max=%d ns, avg=%g ns\n",
granularity_N, min, max, (double)sum/granularity_N);
}
memory_dispose(t);
}
int main(int argc, char** argv)
{
testSleep();
testGranularity();
err += memory_report();
return err == 0? 0 : 1;
};
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