Limit renderer saved frames to avoid running out of fds.

content/browser/renderer_host/render_widget_host_view_aura_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_widget_host_view_aura.h"
 
 #include "base/basictypes.h"
 #include "base/memory/shared_memory.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/output/compositor_frame_metadata.h"
 #include "cc/output/copy_output_request.h"
 #include "content/browser/browser_thread_impl.h"
 #include "content/browser/compositor/resize_lock.h"
 #include "content/browser/renderer_host/render_widget_host_delegate.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/common/gpu/gpu_messages.h"
+#include "content/common/host_shared_bitmap_manager.h"
 #include "content/common/input_messages.h"
 #include "content/common/view_messages.h"
 #include "content/port/browser/render_widget_host_view_frame_subscriber.h"
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/test/mock_render_process_host.h"
 #include "content/public/test/test_browser_context.h"
 #include "ipc/ipc_test_sink.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/aura/client/aura_constants.h"
@@ skipping 1034 matching lines @@
   view_->window_->RemoveObserver(&observer);
 }
 
 TEST_F(RenderWidgetHostViewAuraTest, DiscardDelegatedFrames) {
   size_t max_renderer_frames =
       RendererFrameManager::GetInstance()->max_number_of_saved_frames();
   ASSERT_LE(2u, max_renderer_frames);
   size_t renderer_count = max_renderer_frames + 1;
   gfx::Rect view_rect(100, 100);
   gfx::Size frame_size = view_rect.size();
+  DCHECK_EQ(0u, HostSharedBitmapManager::current()->AllocatedBitmapCount());
 
   scoped_ptr<RenderWidgetHostImpl * []> hosts(
       new RenderWidgetHostImpl* [renderer_count]);
   scoped_ptr<FakeRenderWidgetHostViewAura * []> views(
       new FakeRenderWidgetHostViewAura* [renderer_count]);
 
   // Create a bunch of renderers.
   for (size_t i = 0; i < renderer_count; ++i) {
     hosts[i] = new RenderWidgetHostImpl(
         &delegate_, process_host_, MSG_ROUTING_NONE, false);
@@ skipping 66 matching lines @@
   views[0]->WasShown();
   views[0]->OnSwapCompositorFrame(
       1, MakeDelegatedFrame(1.f, frame_size, view_rect));
   for (size_t i = 0; i < renderer_count; ++i)
     EXPECT_TRUE(views[i]->frame_provider_);
 
   // Make [0] hidden, it should evict its frame.
   views[0]->WasHidden();
   EXPECT_FALSE(views[0]->frame_provider_);
 
+  for (size_t i = 0; i < renderer_count - 1; ++i)
+    views[i]->WasHidden();
+
+  // Allocate enough bitmaps so that two frames (proportionally) would be
+  // enough hit the handle limit.
+  int handles_per_frame = 5;
+  RendererFrameManager::GetInstance()->set_max_handles(handles_per_frame * 2);
+
+  for (size_t i = 0; i < (renderer_count - 1) * handles_per_frame; i++) {
+    HostSharedBitmapManager::current()->ChildAllocatedSharedBitmap(
+        1,
+        base::SharedMemory::NULLHandle(),
+        base::GetCurrentProcessHandle(),
+        cc::SharedBitmap::GenerateId());
+  }
+
+  // Hiding this last bitmap should evict all but two frames.
+  views[renderer_count - 1]->WasHidden();
+  for (size_t i = 0; i < renderer_count; ++i) {
+    if (i + 2 < renderer_count)
+      EXPECT_FALSE(views[i]->frame_provider_);
+    else
+      EXPECT_TRUE(views[i]->frame_provider_);
+  }
+  HostSharedBitmapManager::current()->ProcessRemoved(
+      base::GetCurrentProcessHandle());
+  RendererFrameManager::GetInstance()->set_max_handles(
+      base::SharedMemory::GetHandleLimit());
+
   for (size_t i = 0; i < renderer_count; ++i) {
     views[i]->Destroy();
     delete hosts[i];
   }
 }
 
 TEST_F(RenderWidgetHostViewAuraTest, DiscardDelegatedFramesWithLocking) {
   size_t max_renderer_frames =
       RendererFrameManager::GetInstance()->max_number_of_saved_frames();
   ASSERT_LE(2u, max_renderer_frames);
   size_t renderer_count = max_renderer_frames + 1;
   gfx::Rect view_rect(100, 100);
   gfx::Size frame_size = view_rect.size();
+  DCHECK_EQ(0u, HostSharedBitmapManager::current()->AllocatedBitmapCount());
 
   scoped_ptr<RenderWidgetHostImpl * []> hosts(
       new RenderWidgetHostImpl* [renderer_count]);
   scoped_ptr<FakeRenderWidgetHostViewAura * []> views(
       new FakeRenderWidgetHostViewAura* [renderer_count]);
 
   // Create a bunch of renderers.
   for (size_t i = 0; i < renderer_count; ++i) {
     hosts[i] = new RenderWidgetHostImpl(
         &delegate_, process_host_, MSG_ROUTING_NONE, false);
@@ skipping 161 matching lines @@
 
   // Because the copy request callback may be holding state within it, that
   // state must handle the RWHVA and ImageTransportFactory going away before the
   // callback is called. This test passes if it does not crash as a result of
   // these things being destroyed.
   EXPECT_EQ(2, callback_count_);
   EXPECT_FALSE(result_);
 }
 
 }  // namespace content