Function updateCachedTime

app/redis-6.2.6/src/server.c:1922–1939

We take a cached value of the unix time in the global state because with * virtual memory and aging there is to store the current time in objects at * every object access, and accuracy is not needed. To access a global var is * a lot faster than calling time(NULL). * * This function should be fast because it is called at every command execution * in call(), so it is possible to decide if to

 * such info only when calling this function from serverCron() but not when
 * calling it from call(). */
void updateCachedTime(int update_daylight_info) {
    server.ustime = ustime();
    server.mstime = server.ustime / 1000;
    time_t unixtime = server.mstime / 1000;
    atomicSet(server.unixtime, unixtime);

    /* To get information about daylight saving time, we need to call
     * localtime_r and cache the result. However calling localtime_r in this
     * context is safe since we will never fork() while here, in the main
     * thread. The logging function will call a thread safe version of
     * localtime that has no locks. */
    if (update_daylight_info) {
        struct tm tm;
        time_t ut = server.unixtime;
        localtime_r(&ut,&tm);
        server.daylight_active = tm.tm_isdst;
    }
}

void checkChildrenDone(void) {
    int statloc = 0;