[PATCH v5 1/2] user32/tests: Wait for parent thread before checking child window.
Rémi Bernon
rbernon at codeweavers.com
Mon Jan 13 10:11:42 CST 2020
This test is failing from time to time. Making sure the parent thread
has terminated before continuing triggers the underlying race condition,
and makes the test to always fail.
Signed-off-by: Rémi Bernon <rbernon at codeweavers.com>
---
I'm not sure if the fix in next patch is fine for inclusion in 5.0, but
this first patch should at least make the test to consistently fail.
Notes:
* Directly check the window in grand child thread instead of
waiting, it should have been destroyed already as we waited
for thread completion.
* Start the threads before flushing events and cleaning up
sequences, it should be the same at the end but it gives more time
for children to create their own windows.
* Make all the handles live on the main stack, directly wait on the
child thread handle from the grand child, instead of an additional
event.
* Increase some of the remaining timeouts, it still sometimes times
out on Windows otherwise.
The failure was hard to reproduce. The most reliable way without the
sleep added here is to start multiple runs on the testbot, changing
locale for each run. The locale change seems to have an impact on
the timing and triggers the race condition.
dlls/user32/tests/msg.c | 61 +++++++++++++++++++++++++----------------
1 file changed, 37 insertions(+), 24 deletions(-)
diff --git a/dlls/user32/tests/msg.c b/dlls/user32/tests/msg.c
index 413f25ccc3a..1dd1b5978e7 100644
--- a/dlls/user32/tests/msg.c
+++ b/dlls/user32/tests/msg.c
@@ -8546,6 +8546,8 @@ static void test_paint_messages(void)
struct wnd_event
{
HWND hwnd;
+ HWND child_hwnd;
+ HANDLE child;
HANDLE grand_child;
HANDLE start_event;
HANDLE stop_event;
@@ -8578,44 +8580,50 @@ static DWORD CALLBACK create_grand_child_thread( void *param )
struct wnd_event *wnd_event = param;
HWND hchild;
MSG msg;
+ DWORD ret;
hchild = CreateWindowExA(0, "TestWindowClass", "Test child",
- WS_CHILD | WS_VISIBLE, 0, 0, 10, 10, wnd_event->hwnd, 0, 0, NULL);
+ WS_CHILD | WS_VISIBLE, 0, 0, 10, 10, wnd_event->child_hwnd, 0, 0, NULL);
ok (hchild != 0, "Failed to create child window\n");
flush_events();
flush_sequence();
SetEvent( wnd_event->start_event );
- for (;;)
- {
- MsgWaitForMultipleObjects(0, NULL, FALSE, 1000, QS_ALLINPUT);
- if (!IsWindow( hchild )) break; /* will be destroyed when parent thread exits */
- while (PeekMessageA(&msg, 0, 0, 0, PM_REMOVE)) DispatchMessageA(&msg);
- }
+ ret = WaitForSingleObject( wnd_event->child, 5000 );
+ ok( !ret, "WaitForSingleObject returned %x, error: %u\n", ret, GetLastError() );
+
+ while (PeekMessageA(&msg, 0, 0, 0, PM_REMOVE)) DispatchMessageA(&msg);
+ todo_wine
+ ok( !IsWindow( hchild ), "Child window not destroyed\n" );
+
return 0;
}
static DWORD CALLBACK create_child_thread( void *param )
{
struct wnd_event *wnd_event = param;
- struct wnd_event child_event;
DWORD ret, tid;
MSG msg;
- child_event.hwnd = CreateWindowExA(0, "TestWindowClass", "Test child",
- WS_CHILD | WS_VISIBLE, 0, 0, 10, 10, wnd_event->hwnd, 0, 0, NULL);
- ok (child_event.hwnd != 0, "Failed to create child window\n");
- SetFocus( child_event.hwnd );
+ wnd_event->child_hwnd = CreateWindowExA( 0, "TestWindowClass", "Test child",
+ WS_CHILD | WS_VISIBLE, 0, 0, 10, 10,
+ wnd_event->hwnd, 0, 0, NULL );
+ ok (wnd_event->child_hwnd != 0, "Failed to create child windows\n");
+ SetFocus( wnd_event->child_hwnd );
+
+ wnd_event->grand_child = CreateThread( NULL, 0, create_grand_child_thread, wnd_event, 0, &tid );
+ ok( wnd_event->grand_child != 0, "CreateThread failed, error %u\n", GetLastError() );
+
flush_events();
flush_sequence();
- child_event.start_event = wnd_event->start_event;
- wnd_event->grand_child = CreateThread(NULL, 0, create_grand_child_thread, &child_event, 0, &tid);
for (;;)
{
- DWORD ret = MsgWaitForMultipleObjects(1, &child_event.start_event, FALSE, 1000, QS_SENDMESSAGE);
+ ret = MsgWaitForMultipleObjects(1, &wnd_event->start_event, FALSE, 5000, QS_SENDMESSAGE);
if (ret != 1) break;
while (PeekMessageA(&msg, 0, 0, 0, PM_REMOVE)) DispatchMessageA(&msg);
}
+ ok( !ret, "MsgWaitForMultipleObjects failed %x, error: %u\n", ret, GetLastError() );
+
ret = WaitForSingleObject( wnd_event->stop_event, 5000 );
ok( !ret, "WaitForSingleObject failed %x\n", ret );
return 0;
@@ -8749,33 +8757,38 @@ static void test_interthread_messages(void)
wnd_event.hwnd = CreateWindowExA(0, "TestParentClass", "Test parent", WS_OVERLAPPEDWINDOW | WS_VISIBLE,
100, 100, 200, 200, 0, 0, 0, NULL);
ok (wnd_event.hwnd != 0, "Failed to create parent window\n");
+
+ wnd_event.start_event = CreateEventA( NULL, TRUE, FALSE, NULL );
+ wnd_event.stop_event = CreateEventA( NULL, TRUE, FALSE, NULL );
+
+ wnd_event.child = CreateThread( NULL, 0, create_child_thread, &wnd_event, 0, &tid );
+ ok( wnd_event.child != 0, "CreateThread failed, error %u\n", GetLastError() );
+
flush_events();
flush_sequence();
log_all_parent_messages++;
- wnd_event.start_event = CreateEventA( NULL, TRUE, FALSE, NULL );
- wnd_event.stop_event = CreateEventA( NULL, TRUE, FALSE, NULL );
- hThread = CreateThread( NULL, 0, create_child_thread, &wnd_event, 0, &tid );
for (;;)
{
- ret = MsgWaitForMultipleObjects(1, &wnd_event.start_event, FALSE, 1000, QS_SENDMESSAGE);
+ ret = MsgWaitForMultipleObjects(1, &wnd_event.start_event, FALSE, 5000, QS_SENDMESSAGE);
if (ret != 1) break;
while (PeekMessageA(&msg, 0, 0, 0, PM_REMOVE)) DispatchMessageA(&msg);
}
ok( !ret, "MsgWaitForMultipleObjects failed %x\n", ret );
/* now wait for the thread without processing messages; this shouldn't deadlock */
SetEvent( wnd_event.stop_event );
- ret = WaitForSingleObject( hThread, 5000 );
+
+ ret = WaitForSingleObject( wnd_event.child, 5000 );
ok( !ret, "WaitForSingleObject failed %x\n", ret );
- CloseHandle( hThread );
ret = WaitForSingleObject( wnd_event.grand_child, 5000 );
- ok( !ret, "WaitForSingleObject failed %x\n", ret );
- CloseHandle( wnd_event.grand_child );
+ ok( !ret, "WaitForSingleObject failed %x, error: %u\n", ret, GetLastError() );
+ CloseHandle( wnd_event.child );
+ CloseHandle( wnd_event.grand_child );
CloseHandle( wnd_event.start_event );
CloseHandle( wnd_event.stop_event );
flush_events();
- ok_sequence(WmExitThreadSeq, "destroy child on thread exit", FALSE);
+ ok_sequence(WmExitThreadSeq, "destroy child on thread exit", TRUE);
log_all_parent_messages--;
DestroyWindow( wnd_event.hwnd );
--
2.25.0.rc2
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