Allow the scheduler to unblock the current process.

It's a bit confusing that the "current" process is not actually running
while we're inside the scheduler. Perhaps the scheduler should redirect
"current" to its own dummy Process. I'm not sure.

Regardless, this patch improves responsiveness by allowing the scheduler
to unblock a process right after it calls select() in case it already has
a pending wakeup request.

1 files changed, 12 insertions, 2 deletions

diff --git a/WindowServer/WSWindowManager.cpp b/WindowServer/WSWindowManager.cpp
index 710eefea55..1f0162e20b 100644
--- a/WindowServer/WSWindowManager.cpp
+++ b/WindowServer/WSWindowManager.cpp
@@ -10,6 +10,7 @@
 #include <AK/StdLibExtras.h>
 
 //#define DEBUG_FLUSH_YELLOW
+//#define DEBUG_COUNTERS
 
 static const int windowTitleBarHeight = 16;
 
@@ -109,6 +110,10 @@ WSWindowManager::WSWindowManager()
     : m_framebuffer(WSFrameBuffer::the())
     , m_screen_rect(m_framebuffer.rect())
 {
+#ifndef DEBUG_COUNTERS
+    (void)m_recompose_count;
+    (void)m_flush_count;
+#endif
     auto size = m_screen_rect.size();
     m_front_bitmap = GraphicsBitmap::create_wrapper(size, m_framebuffer.scanline(0));
     auto* region = current->allocate_region(LinearAddress(), size.width() * size.height() * sizeof(RGBA32), "BackBitmap", true, true, true);
@@ -266,9 +271,10 @@ void WSWindowManager::processMouseEvent(MouseEvent& event)
 void WSWindowManager::compose()
 {
     auto invalidated_rects = move(m_invalidated_rects);
-    printf("[WM] compose #%u (%u rects)\n", ++m_recompose_count, invalidated_rects.size());
-
+#ifdef DEBUG_COUNTERS
+    dbgprintf("[WM] compose #%u (%u rects)\n", ++m_recompose_count, invalidated_rects.size());
     dbgprintf("kmalloc stats: alloc:%u free:%u eternal:%u\n", sum_alloc, sum_free, kmalloc_sum_eternal);
+#endif
 
     auto any_window_contains_rect = [this] (const Rect& r) {
         for (auto* window = m_windows_in_order.head(); window; window = window->next()) {
@@ -387,6 +393,10 @@ void WSWindowManager::flush(const Rect& a_rect)
 {
     auto rect = Rect::intersection(a_rect, m_screen_rect);
 
+#ifdef DEBUG_COUNTERS
+    dbgprintf("[WM] flush #%u (%d,%d %dx%d)\n", ++m_flush_count, rect.x(), rect.y(), rect.width(), rect.height());
+#endif
+
     RGBA32* front_ptr = m_front_bitmap->scanline(rect.y()) + rect.x();
     const RGBA32* back_ptr = m_back_bitmap->scanline(rect.y()) + rect.x();
     size_t pitch = m_back_bitmap->pitch();