49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
#include <time.h>
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#include <stdio.h>
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#include <assert.h>
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#include <stdint.h>
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struct timespec timespec_sub(const struct timespec * a,
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const struct timespec * b)
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{
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struct timespec c = {
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.tv_sec = a->tv_sec - b->tv_sec,
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.tv_nsec = a->tv_nsec - b->tv_nsec
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};
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if (c.tv_nsec < 0) {
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c.tv_nsec += 1000000000;
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c.tv_sec -= 1;
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}
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return c;
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}
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struct timespec timespec_add(const struct timespec * a,
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const struct timespec * b)
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{
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struct timespec c = {
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.tv_sec = a->tv_sec + b->tv_sec,
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.tv_nsec = a->tv_nsec + b->tv_nsec
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};
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int64_t rem = c.tv_nsec / 1000000000;
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c.tv_nsec = c.tv_nsec % 1000000000;
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c.tv_sec += rem;
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return c;
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}
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struct timespec timespec_average(const struct timespec * ts,
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int length)
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{
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struct timespec c = {0};
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for (int i = 0; i < length; i++) {
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c = timespec_add(&c, &ts[i]);
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//printf("rtt[%d]: %ld.%09ld\n", i, ts[i].tv_sec, ts[i].tv_nsec);
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}
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int64_t rem = c.tv_sec % length;
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c.tv_sec /= length;
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c.tv_nsec = (c.tv_nsec / length) + (rem * 1000000000 / length);
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assert(c.tv_nsec < 1000000000);
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//printf("average: %ld.%09ld\n", c.tv_sec, c.tv_nsec);
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return c;
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}
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