Set thread priorities to time critical.

dlls/winmm/wineoss/audio.c

@@ -1972,6 +1972,8 @@ DWORD wodOpen(WORD wDevID, LPWAVEOPENDESC lpDesc, DWORD dwFlags)
 
     wwo->hStartUpEvent = CreateEventW(NULL, FALSE, FALSE, NULL);
     wwo->hThread = CreateThread(NULL, 0, wodPlayer, (LPVOID)(DWORD)wDevID, 0, &(wwo->dwThreadID));
+    if (wwo->hThread)
+        SetThreadPriority(wwo->hThread, THREAD_PRIORITY_TIME_CRITICAL);
     WaitForSingleObject(wwo->hStartUpEvent, INFINITE);
     CloseHandle(wwo->hStartUpEvent);
     wwo->hStartUpEvent = INVALID_HANDLE_VALUE;
@@ -2819,6 +2821,8 @@ DWORD widOpen(WORD wDevID, LPWAVEOPENDESC lpDesc, DWORD dwFlags)
 
     wwi->hStartUpEvent = CreateEventW(NULL, FALSE, FALSE, NULL);
     wwi->hThread = CreateThread(NULL, 0, widRecorder, (LPVOID)(DWORD)wDevID, 0, &(wwi->dwThreadID));
+    if (wwi->hThread)
+        SetThreadPriority(wwi->hThread, THREAD_PRIORITY_TIME_CRITICAL);
     WaitForSingleObject(wwi->hStartUpEvent, INFINITE);
     CloseHandle(wwi->hStartUpEvent);
     wwi->hStartUpEvent = INVALID_HANDLE_VALUE;

dlls/winmm/wineoss/midi.c

@@ -739,6 +739,7 @@ static DWORD midOpen(WORD wDevID, LPMIDIOPENDESC lpDesc, DWORD dwFlags)
 	    midiCloseSeq();
 	    return MMSYSERR_ERROR;
 	}
+        SetThreadPriority(hThread, THREAD_PRIORITY_TIME_CRITICAL);
 	TRACE("Created thread for midi-in\n");
     }