refactor: rename the atom directory to shell

shell/common/node_bindings_win.cc

@@ -0,0 +1,53 @@
+// Copyright (c) 2013 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#include "atom/common/node_bindings_win.h"
+
+#include <windows.h>
+
+#include "base/logging.h"
+#include "base/system/sys_info.h"
+
+namespace atom {
+
+NodeBindingsWin::NodeBindingsWin(BrowserEnvironment browser_env)
+    : NodeBindings(browser_env) {
+  // on single-core the io comp port NumberOfConcurrentThreads needs to be 2
+  // to avoid cpu pegging likely caused by a busy loop in PollEvents
+  if (base::SysInfo::NumberOfProcessors() == 1) {
+    // the expectation is the uv_loop_ has just been initialized
+    // which makes iocp replacement safe
+    CHECK_EQ(0u, uv_loop_->active_handles);
+    CHECK_EQ(0u, uv_loop_->active_reqs.count);
+
+    if (uv_loop_->iocp && uv_loop_->iocp != INVALID_HANDLE_VALUE)
+      CloseHandle(uv_loop_->iocp);
+    uv_loop_->iocp = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, 0, 2);
+  }
+}
+
+NodeBindingsWin::~NodeBindingsWin() {}
+
+void NodeBindingsWin::PollEvents() {
+  // If there are other kinds of events pending, uv_backend_timeout will
+  // instruct us not to wait.
+  DWORD bytes, timeout;
+  ULONG_PTR key;
+  OVERLAPPED* overlapped;
+
+  timeout = uv_backend_timeout(uv_loop_);
+
+  GetQueuedCompletionStatus(uv_loop_->iocp, &bytes, &key, &overlapped, timeout);
+
+  // Give the event back so libuv can deal with it.
+  if (overlapped != NULL)
+    PostQueuedCompletionStatus(uv_loop_->iocp, bytes, key, overlapped);
+}
+
+// static
+NodeBindings* NodeBindings::Create(BrowserEnvironment browser_env) {
+  return new NodeBindingsWin(browser_env);
+}
+
+}  // namespace atom