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uasync: fix stall detection — record timestamp after poll wait, not before

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Evgeny committed 2026-07-27 19:42:35 +03:00
1 parent 48bfe644c4
commit a47ef86810
2 files changed
+10 -6
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lib/u_async.c
+9 -5
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@@ -985,11 +985,10 @@ void uasync_poll(struct UASYNC* ua, int timeout_tb) {
if (!ua->sockets || !ua->timeout_heap) return;
uint64_t now_us_poll_entry = get_time_us();
if (ua->last_poll_entry_us && now_us_poll_entry - ua->last_poll_entry_us > 10000) {
DEBUG_WARN(DEBUG_CATEGORY_UASYNC, "Event loop stall: %lluus since last poll entry",
(unsigned long long)(now_us_poll_entry - ua->last_poll_entry_us));
if (ua->last_poll_exit_us && now_us_poll_entry - ua->last_poll_exit_us > 10000) {
DEBUG_WARN(DEBUG_CATEGORY_UASYNC, "Event loop stall: %lluus since end of last poll processing",
(unsigned long long)(now_us_poll_entry - ua->last_poll_exit_us));
}
ua->last_poll_entry_us = now_us_poll_entry;
DEBUG_DEBUG(DEBUG_CATEGORY_UASYNC, "poll(%d sockets, %zu timers, timeout=%d.%dms)",
ua->sockets->count, ua->timeout_heap->size, timeout_tb >= 0 ? timeout_tb / 10000 : -1,
@@ -1040,6 +1039,7 @@ void uasync_poll(struct UASYNC* ua, int timeout_tb) {
timeout_ms = (poll_timeout.tv_sec * 1000) + (poll_timeout.tv_usec / 1000);
} else {
// Nothing to do - return immediately
ua->last_poll_exit_us = get_time_us();
return;
}
}
@@ -1051,6 +1051,7 @@ void uasync_poll(struct UASYNC* ua, int timeout_tb) {
int max_events = 64;
int ret = epoll_wait(ua->epoll_fd, events, max_events, timeout_ms);
ua->last_poll_exit_us = get_time_us();
if (ret < 0) {
if (errno == EINTR) {
return;
@@ -1086,6 +1087,7 @@ void uasync_poll(struct UASYNC* ua, int timeout_tb) {
nanosleep(&ts, NULL);
#endif
}
ua->last_poll_exit_us = get_time_us();
process_timeouts(ua);
return;
}
@@ -1129,6 +1131,7 @@ void uasync_poll(struct UASYNC* ua, int timeout_tb) {
tv.tv_usec = (timeout_ms % 1000) * 1000;
int ret = select((int)max_fd + 1, &read_fds, &write_fds, &except_fds, &tv);
ua->last_poll_exit_us = get_time_us();
if (ret < 0) {
int err = WSAGetLastError();
@@ -1203,6 +1206,7 @@ void uasync_poll(struct UASYNC* ua, int timeout_tb) {
}
int ret = poll(ua->poll_fds, ua->poll_fds_count, timeout_ms);
ua->last_poll_exit_us = get_time_us();
if (ret < 0) {
if (errno == EINTR) {
return;
@@ -1327,7 +1331,7 @@ struct UASYNC* uasync_create(void) {
ua->posted_tasks_head = NULL;
ua->immediate_queue_head = NULL;
ua->immediate_queue_tail = NULL;
ua->last_poll_entry_us = 0;
ua->last_poll_exit_us = 0;
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "Creating SA...");
ua->sockets = socket_array_create(16);