[PATCH v5 1/2] user32/tests: Wait for parent thread before checking child window.
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(a)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
On thread destroy, a WM_WINE_DESTROYWINDOW is sent to the child windows living in other threads. However there's then a race condition between these threads peeking for messages and the current thread detaching its child windows from their threads and clearing their message queues. Signed-off-by: Rémi Bernon <rbernon(a)codeweavers.com> --- Notes: v5: Instead of conditionally detaching child windows from the owning thread, which left some dangling references, this checks the child window's thread and state before destroying it. If the owning thread is still running, it will reap its own windows on exit. Otherwise it should be safe to destroy the windows on its behalf. dlls/user32/tests/msg.c | 3 +-- server/window.c | 16 ++++++++++++++-- 2 files changed, 15 insertions(+), 4 deletions(-) diff --git a/dlls/user32/tests/msg.c b/dlls/user32/tests/msg.c index 1dd1b5978e7..030fdfaf23b 100644 --- a/dlls/user32/tests/msg.c +++ b/dlls/user32/tests/msg.c @@ -8593,7 +8593,6 @@ static DWORD CALLBACK create_grand_child_thread( void *param ) 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; @@ -8788,7 +8787,7 @@ static void test_interthread_messages(void) CloseHandle( wnd_event.start_event ); CloseHandle( wnd_event.stop_event ); flush_events(); - ok_sequence(WmExitThreadSeq, "destroy child on thread exit", TRUE); + ok_sequence(WmExitThreadSeq, "destroy child on thread exit", FALSE); log_all_parent_messages--; DestroyWindow( wnd_event.hwnd ); diff --git a/server/window.c b/server/window.c index c9b131cba5d..cd413ba1023 100644 --- a/server/window.c +++ b/server/window.c @@ -1888,9 +1888,21 @@ void destroy_window( struct window *win ) /* destroy all children */ while (!list_empty(&win->children)) - destroy_window( LIST_ENTRY( list_head(&win->children), struct window, entry )); + { + struct window *child = LIST_ENTRY( list_head(&win->children), struct window, entry ); + if (!child->thread || child->thread == win->thread || child->thread->state != RUNNING) + destroy_window( child ); + else + list_remove(&child->entry); + } while (!list_empty(&win->unlinked)) - destroy_window( LIST_ENTRY( list_head(&win->unlinked), struct window, entry )); + { + struct window *child = LIST_ENTRY( list_head(&win->unlinked), struct window, entry ); + if (!child->thread || child->thread == win->thread || child->thread->state != RUNNING) + destroy_window( child ); + else + list_remove(&child->entry); + } /* reset global window pointers, if the corresponding window is destroyed */ if (win == shell_window) shell_window = NULL; -- 2.25.0.rc2
Hi, While running your changed tests, I think I found new failures. Being a bot and all I'm not very good at pattern recognition, so I might be wrong, but could you please double-check? Full results can be found at: https://testbot.winehq.org/JobDetails.pl?Key=63159 Your paranoid android. === w8adm (32 bit report) === user32: msg.c:17582: Test failed: wrong status 00080000 === w1064v1809_ar (32 bit report) === user32: msg.c:5130: Test failed: ShowWindow(SW_HIDE):overlapped: 0: the msg sequence is not complete: expected 0000 - actual 0024
participants (2)
-
Marvin -
Rémi Bernon