[PATCH v3 1/1] win32u: Check for driver events more often.

[William Horvath]

From: William Horvath

Use a QPC wrapper to avoid NtGetTickCount, which is coupled to
the 16 millisecond user_shared_data_timeout in server/fd.c. This
lowers the throttling period to 0.25ms (8khz), which is quick
enough to consume driver events from high polling rate devices.

Fixes: 54ca1ab6
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=57442
---
 dlls/win32u/message.c        | 14 +++++++++++---
 dlls/win32u/ntuser_private.h |  2 +-
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/dlls/win32u/message.c b/dlls/win32u/message.c
index ef8b6f86431..d8da5a0f48f 100644
--- a/dlls/win32u/message.c
+++ b/dlls/win32u/message.c
@@ -3059,14 +3059,22 @@ static HANDLE get_server_queue_handle(void)
     return ret;
 }

+/* monotonic timer tick for throttling driver event checks */
+static inline LONGLONG get_driver_check_time(void)
+{
+    LARGE_INTEGER counter, freq;
+    NtQueryPerformanceCounter( &counter, &freq );
+    return counter.QuadPart * 8000 / freq.QuadPart; /* 8kHz */
+}
+
 /* check for driver events if we detect that the app is not properly consuming messages */
 static inline void check_for_driver_events(void)
 {
-    if (get_user_thread_info()->last_driver_time != NtGetTickCount())
+    if (get_user_thread_info()->last_driver_time != get_driver_check_time())
     {
         flush_window_surfaces( FALSE );
         user_driver->pProcessEvents( QS_ALLINPUT );
-        get_user_thread_info()->last_driver_time = NtGetTickCount();
+        get_user_thread_info()->last_driver_time = get_driver_check_time();
     }
 }

@@ -3108,7 +3116,7 @@ static DWORD wait_message( DWORD count, const HANDLE *handles, DWORD timeout, DW
     }

if (ret == WAIT_TIMEOUT && !count && !timeout) NtYieldExecution();
-    if (ret == count - 1) get_user_thread_info()->last_driver_time = NtGetTickCount();
+    if (ret == count - 1) get_user_thread_info()->last_driver_time = get_driver_check_time();

KeUserDispatchCallback( &params.dispatch, sizeof(params), &ret_ptr, &ret_len );

diff --git a/dlls/win32u/ntuser_private.h b/dlls/win32u/ntuser_private.h
index f7a3460a0a6..2f3bbdf91c0 100644
--- a/dlls/win32u/ntuser_private.h
+++ b/dlls/win32u/ntuser_private.h
@@ -109,7 +109,7 @@ struct user_thread_info
     struct ntuser_thread_info     client_info;            /* Data shared with client */
     HANDLE                        server_queue;           /* Handle to server-side queue */
     DWORD                         last_getmsg_time;       /* Get/PeekMessage last request time */
-    DWORD                         last_driver_time;       /* Get/PeekMessage driver event time */
+    LONGLONG                      last_driver_time;       /* Get/PeekMessage driver event time */
     WORD                          hook_call_depth;        /* Number of recursively called hook procs */
     WORD                          hook_unicode;           /* Is current hook unicode? */
     HHOOK                         hook;                   /* Current hook */