[PATCH 1/6] win32u: Check queue signaled state after processing events.

[Rémi Bernon]

From: Rémi Bernon

Instead of relying on ProcessEvents return value.
---
 dlls/win32u/message.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/dlls/win32u/message.c b/dlls/win32u/message.c
index dc316922581..87efad6202c 100644
--- a/dlls/win32u/message.c
+++ b/dlls/win32u/message.c
@@ -3164,9 +3164,25 @@ static HANDLE get_server_queue_handle(void)
     return ret;
 }

+static BOOL is_queue_signaled(void)
+{
+    struct object_lock lock = OBJECT_LOCK_INIT;
+    const queue_shm_t *queue_shm;
+    BOOL signaled = FALSE;
+    UINT status;
+
+    while ((status = get_shared_queue( &lock, &queue_shm )) == STATUS_PENDING)
+        signaled = (queue_shm->wake_bits & queue_shm->wake_mask) ||
+                   (queue_shm->changed_bits & queue_shm->changed_mask);
+    if (status) return FALSE;
+
+    return signaled;
+}
+
 BOOL process_driver_events( UINT mask )
 {
-    return user_driver->pProcessEvents( mask );
+    user_driver->pProcessEvents( mask );
+    return is_queue_signaled();
 }

void check_for_events( UINT flags )