Mojo: AsyncWaiter and mojo/public/environment

Summary of changes:

 o BindingsSupport is gone:
   - mojo/public/bindings/lib depends on mojo/public/environment/,
     which is also a static library.
   - mojo/public/environment provides a default implementation of
     MojoAsyncWaiter (replacing the AsyncWait functionality of
     BindingsSupport).
   - mojo/public/environment provides TLS support for storing the
     current Buffer* (replacing the Set/GetCurrentBuffer functionality
     of BindingsSupport).
   - mojo/public/environment provides the Environment class, formerly
     part of mojo/public/utility/
   - The standalone implementation of mojo/public/environment/ depends
     on mojo/public/utility/ and assumes clients will be instantiating
     RunLoops on their threads.
   - The chromium-specific implementation of mojo/public/environment/
     depends on mojo/common/ and assumes clients will be instantiating
     MessageLoops on their threads.
   - The chromium-specific implementation of mojo/public/environment/
     is divided into two targets: mojo_environment_chromium and
     mojo_environment_chromium_impl. The former is a static library and
     the latter is a component. (This way all of the state--TLS keys--
     associated with the environment is kept in a DSO when using a
     component build.)

 o RemotePtr and Connector may optionally be parameterized with a
   MojoAsyncWaiter*, allowing users to customize how AsyncWait is
   implemented for a particular usage of bindings. This is needed by
   the GL library so that it can schedule work on an application
   defined run loop.

 o RunLoop gains a RunUntilIdle method to support tests. This allows us
   to delete SimpleBindingsSupport instead of converting it over to an
   implementation of MojoAsyncWaiter.

Review URL: https://codereview.chromium.org/134253004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244739 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 51 insertions, 0 deletions

diff --git a/mojo/environment/async_waiter_impl.cc b/mojo/environment/async_waiter_impl.cc
new file mode 100644
index 0000000..ab0599a
--- /dev/null
+++ b/mojo/environment/async_waiter_impl.cc
@@ -0,0 +1,51 @@
+// Copyright 2014 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 "mojo/environment/async_waiter_impl.h"
+
+#include "base/bind.h"
+#include "mojo/common/handle_watcher.h"
+
+namespace mojo {
+namespace internal {
+namespace {
+
+void OnHandleReady(common::HandleWatcher* watcher,
+                   MojoAsyncWaitCallback callback,
+                   uintptr_t user_data,
+                   MojoResult result) {
+  delete watcher;
+  callback(user_data, result);
+}
+
+MojoAsyncWaitID AsyncWait(MojoAsyncWaiter* waiter,
+                          MojoHandle handle,
+                          MojoWaitFlags flags,
+                          MojoDeadline deadline,
+                          MojoAsyncWaitCallback callback,
+                          uintptr_t user_data) {
+  // This instance will be deleted when done or cancelled.
+  common::HandleWatcher* watcher = new common::HandleWatcher();
+  watcher->Start(Handle(handle), flags, deadline,
+                 base::Bind(&OnHandleReady, watcher, callback, user_data));
+  return reinterpret_cast<MojoAsyncWaitID>(watcher);
+}
+
+void CancelWait(MojoAsyncWaiter* waiter, MojoAsyncWaitID wait_id) {
+  delete reinterpret_cast<common::HandleWatcher*>(wait_id);
+}
+
+MojoAsyncWaiter s_default_async_waiter = {
+  AsyncWait,
+  CancelWait
+};
+
+}  // namespace
+
+MojoAsyncWaiter* GetDefaultAsyncWaiterImpl() {
+  return &s_default_async_waiter;
+}
+
+}  // namespace internal
+}  // namespace mojo