Function debugDelay

app/redis-6.2.6/src/debug.c:1983–1988

Positive input is sleep time in microseconds. Negative input is fractions * of microseconds, i.e. -10 means 100 nanoseconds. */

/* Positive input is sleep time in microseconds. Negative input is fractions
 * of microseconds, i.e. -10 means 100 nanoseconds. */
void debugDelay(int usec) {
    /* Since even the shortest sleep results in context switch and system call,
     * the way we achive short sleeps is by statistically sleeping less often. */
    if (usec < 0) usec = (rand() % -usec) == 0 ? 1: 0;
    if (usec) usleep(usec);
}