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c8eff5e44f
This updates to mojo commit d259eb58aa59 and limits the roll script to only pull in the parts of //mojo that are currently being used. More stuff will be dropped in the future.
64 lines
1.9 KiB
C++
64 lines
1.9 KiB
C++
// Copyright 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef MOJO_MESSAGE_PUMP_HANDLE_WATCHER_H_
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#define MOJO_MESSAGE_PUMP_HANDLE_WATCHER_H_
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#include "base/basictypes.h"
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#include "base/callback_forward.h"
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#include "base/memory/scoped_ptr.h"
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#include "base/run_loop.h"
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#include "mojo/public/cpp/system/core.h"
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namespace base {
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class Thread;
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}
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namespace mojo {
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namespace common {
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namespace test {
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class HandleWatcherTest;
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}
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// HandleWatcher is used to asynchronously wait on a handle and notify a Closure
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// when the handle is ready, or the deadline has expired.
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class HandleWatcher {
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public:
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HandleWatcher();
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// The destructor implicitly stops listening. See Stop() for details.
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~HandleWatcher();
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// Starts listening for |handle|. This implicitly invokes Stop(). In other
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// words, Start() performs one asynchronous watch at a time. It is ok to call
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// Start() multiple times, but it cancels any existing watches. |callback| is
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// notified when the handle is ready, invalid or deadline has passed and is
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// notified on the thread Start() was invoked on. If the current thread exits
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// before the handle is ready, then |callback| is invoked with a result of
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// MOJO_RESULT_ABORTED.
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void Start(const Handle& handle,
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MojoHandleSignals handle_signals,
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MojoDeadline deadline,
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const base::Callback<void(MojoResult)>& callback);
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// Stops listening. Does nothing if not in the process of listening. Blocks
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// until no longer listening on the handle.
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void Stop();
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private:
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class StateBase;
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class SameThreadWatchingState;
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class SecondaryThreadWatchingState;
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// If non-NULL Start() has been invoked.
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scoped_ptr<StateBase> state_;
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DISALLOW_COPY_AND_ASSIGN(HandleWatcher);
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};
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} // namespace common
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} // namespace mojo
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#endif // MOJO_MESSAGE_PUMP_HANDLE_WATCHER_H_
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