[PATCH 4/5] user32: Only recheck monitor cache once per second.

[Matteo Bruni]

Signed-off-by: Matteo Bruni 
---
 dlls/user32/sysparams.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/dlls/user32/sysparams.c b/dlls/user32/sysparams.c
index d4462e589e8a..52a32d5e1c59 100644
--- a/dlls/user32/sysparams.c
+++ b/dlls/user32/sysparams.c
@@ -313,6 +313,7 @@ static const WCHAR GUID_DEVINTERFACE_MONITOR[] = {'#','{','e','6','f','0','7','b
 /* Cached monitor information */
 static MONITORINFOEXW *monitors;
 static UINT monitor_count;
+static DWORD last_cache_check_time;
 static FILETIME last_query_monitors_time;
 static CRITICAL_SECTION monitors_section;
 static CRITICAL_SECTION_DEBUG monitors_critsect_debug =
@@ -3952,13 +3953,19 @@ static BOOL update_monitor_cache(void)
     DWORD i = 0, j;
     DWORD type;

+    if (monitor_count && GetTickCount() - last_cache_check_time < 1000)
+        return TRUE;
+
     /* Update monitor cache from SetupAPI if it's outdated */
     if (!video_key && RegOpenKeyW( HKEY_LOCAL_MACHINE, VIDEO_KEY, &video_key ))
         return FALSE;
     if (RegQueryInfoKeyW( video_key, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, &filetime ))
         return FALSE;
     if (CompareFileTime( &filetime, &last_query_monitors_time ) < 1)
+    {
+        last_cache_check_time = GetTickCount();
         return TRUE;
+    }

mutex = get_display_device_init_mutex();
     EnterCriticalSection( &monitors_section );
@@ -4020,6 +4027,7 @@ static BOOL update_monitor_cache(void)
     }

last_query_monitors_time = filetime;
+    last_cache_check_time = GetTickCount();
     ret = TRUE;
 fail:
     SetupDiDestroyDeviceInfoList( devinfo );