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769cabbadf
0xFFFFFFFF milliseconds is 4,294,967,295 ms so about 50 days. A little bit too close for comfort. Use int64_t instead of uint64_t to avoid C's implicit conversion footguns in computations.
33 lines
763 B
C
33 lines
763 B
C
#define _POSIX_C_SOURCE 200809L
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#include <stdint.h>
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#include <time.h>
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#include "util/time.h"
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static const long NSEC_PER_SEC = 1000000000;
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int64_t timespec_to_msec(const struct timespec *a) {
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return (int64_t)a->tv_sec * 1000 + a->tv_nsec / 1000000;
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}
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void timespec_from_nsec(struct timespec *r, int64_t nsec) {
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r->tv_sec = nsec / NSEC_PER_SEC;
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r->tv_nsec = nsec % NSEC_PER_SEC;
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}
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int64_t get_current_time_msec(void) {
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struct timespec now;
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clock_gettime(CLOCK_MONOTONIC, &now);
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return timespec_to_msec(&now);
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}
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void timespec_sub(struct timespec *r, const struct timespec *a,
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const struct timespec *b) {
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r->tv_sec = a->tv_sec - b->tv_sec;
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r->tv_nsec = a->tv_nsec - b->tv_nsec;
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if (r->tv_nsec < 0) {
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r->tv_sec--;
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r->tv_nsec += NSEC_PER_SEC;
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}
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}
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