[Bug 52474] New: ws2_32:sock fails intermittently - 'Test failed: expected timeout'

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=52474

Bug ID: 52474
           Summary: ws2_32:sock fails intermittently - 'Test failed:
                    expected timeout'
           Product: Wine
           Version: 7.0
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: winsock
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

The test_connect_events() function contains the following checks, where the
check (2) fails intermittently:

1. check_events(ctx, FD_CONNECT, FD_WRITE, 200);
2. check_events(ctx, 0, 0, 0);

A hypothesis for the cause of the test failure is that the
WSAEnumNetworkEvents() call inside the check (1) races with the server setting
the event.

Note that WSAEnumNetworkEvents performs the following steps:

a. It calls ResetEvent on the given event.
b. It issues IOCTL_AFD_GET_EVENTS command on the socket to retrieve the events
so far.

It's possible that the event may be set by the server between (a) and (b),
which lingers until the next call to WSAEnumNetworkEvents().  This explains why
the event wait in check (2) is satisfied immediately but subsequent tests
report no events.