libevent ioevent benchmark exits with persistent events still registered

[OneBucket126]

Summary

Events are deleted before being reinitialized on the next run, so iterations 1-24 are balanced. After the final run, however, all persistent events remain registered and the process calls exit(0) without event_del() or base cleanup.

Affected code

• Repository commit: 477033f938fd47dfecde43c82257cd286d9fa38e
• File: benchmark/ioevent/libevent/libevent_ioevent_bench.c
• Original scanner location: line 105

Evidence

Source: benchmark/ioevent/libevent/libevent_ioevent_bench.c lines 94-106

  94: static struct timeval *
  95: run_once(void)
  96: {
  97: 	evutil_socket_t *cp, space;
  98: 	long i;
  99: 	static struct timeval ts, te;
 100: 
 101: 	for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
 102: 		if (event_initialized(&events[i]))
 103: 			event_del(&events[i]);
 104: 		event_set(&events[i], cp[0], EV_READ | EV_PERSIST, read_cb, (void *)(ev_intptr_t) i);
 105: 		event_add(&events[i], NULL);
 106: 	}

Source: benchmark/ioevent/libevent/libevent_ioevent_bench.c lines 196-208

 196:     long sum = 0;
 197: 	for (i = 0; i < 25; i++) {
 198: 		tv = run_once();
 199: 		if (tv == NULL)
 200: 			exit(1);
 201: 		fprintf(stdout, "%ld\n",
 202: 			tv->tv_sec * 1000000L + tv->tv_usec);
 203:         sum += tv->tv_sec * 1000000L + tv->tv_usec;
 204: 	}
 205:     fprintf(stdout, "%s Average : %ld\n", argv[0], sum/25);
 206: 
 207: 	exit(0);
 208: }

Impact

Pending event registrations and their base survive until process termination; this is real but has little runtime impact for this benchmark.