+static void process_evlist(struct evlist *evlist, unsigned int interval)
+{
+ enum evlist_ctl_cmd cmd = EVLIST_CTL_CMD_UNSUPPORTED;
+
+ if (evlist__ctlfd_process(evlist, &cmd) > 0) {
+ switch (cmd) {
+ case EVLIST_CTL_CMD_ENABLE:
+ pr_info(EVLIST_ENABLED_MSG);
+ if (interval)
+ process_interval();
+ break;
+ case EVLIST_CTL_CMD_DISABLE:
+ if (interval)
+ process_interval();
+ pr_info(EVLIST_DISABLED_MSG);
+ break;
+ case EVLIST_CTL_CMD_ACK:
+ case EVLIST_CTL_CMD_UNSUPPORTED:
+ default:
+ break;
+ }
+ }
+}
+
+static void compute_tts(struct timespec *time_start, struct timespec *time_stop,
+ int *time_to_sleep)
+{
+ int tts = *time_to_sleep;
+ struct timespec time_diff;
+
+ diff_timespec(&time_diff, time_stop, time_start);
+
+ tts -= time_diff.tv_sec * MSEC_PER_SEC +
+ time_diff.tv_nsec / NSEC_PER_MSEC;
+
+ if (tts < 0)
+ tts = 0;
+
+ *time_to_sleep = tts;
+}
+
+static int dispatch_events(bool forks, int timeout, int interval, int *times)
+{
+ int child_exited = 0, status = 0;
+ int time_to_sleep, sleep_time;
+ struct timespec time_start, time_stop;
+
+ if (interval)
+ sleep_time = interval;
+ else if (timeout)
+ sleep_time = timeout;
+ else
+ sleep_time = 1000;
+
+ time_to_sleep = sleep_time;
+
+ while (!done) {
+ if (forks)
+ child_exited = waitpid(child_pid, &status, WNOHANG);
+ else
+ child_exited = !is_target_alive(&target, evsel_list->core.threads) ? 1 : 0;
+
+ if (child_exited)
+ break;
+
+ clock_gettime(CLOCK_MONOTONIC, &time_start);
+ if (!(evlist__poll(evsel_list, time_to_sleep) > 0)) { /* poll timeout or EINTR */
+ if (timeout || handle_interval(interval, times))
+ break;
+ time_to_sleep = sleep_time;
+ } else { /* fd revent */
+ process_evlist(evsel_list, interval);
+ clock_gettime(CLOCK_MONOTONIC, &time_stop);
+ compute_tts(&time_start, &time_stop, &time_to_sleep);
+ }
+ }
+
+ return status;
+}
+