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Side by Side Diff: mojo/system/embedder.h

Issue 139823003: Mojo: Move system embedder API files to mojo/system/embedder. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: Created 6 years, 11 months ago
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1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef MOJO_SYSTEM_EMBEDDER_H_
6 #define MOJO_SYSTEM_EMBEDDER_H_
7
8 #include "base/callback.h"
9 #include "base/memory/ref_counted.h"
10 #include "base/task_runner.h"
11 #include "mojo/public/system/core.h"
12 #include "mojo/system/scoped_platform_handle.h"
13 #include "mojo/system/system_impl_export.h"
14
15 namespace mojo {
16 namespace embedder {
17
18 // Must be called first to initialize the (global, singleton) system.
19 MOJO_SYSTEM_IMPL_EXPORT void Init();
20
21 // Creates a new "channel", returning a handle to the bootstrap message pipe on
22 // that channel. |platform_handle| should be an OS-dependent handle to one side
23 // of a suitable bidirectional OS "pipe" (e.g., a file descriptor to a socket on
24 // POSIX, a handle to a named pipe on Windows); this "pipe" should be connected
25 // and ready for operation (e.g., to be written to or read from).
26 // |io_thread_task_runner| should be a |TaskRunner| for the thread on which the
27 // "channel" will run (read data and demultiplex).
28 //
29 // Returns |MOJO_HANDLE_INVALID| on error. Note that this will happen only if,
30 // e.g., the handle table is full (operation of the channel begins
31 // asynchronously and if, e.g., the other end of the "pipe" is closed, this will
32 // report an error to the returned handle in the usual way).
33 //
34 // Notes: The handle returned is ready for use immediately, with messages
35 // written to it queued. E.g., it would be perfectly valid for a message to be
36 // immediately written to the returned handle and the handle closed, all before
37 // the channel has begun operation on the IO thread. In this case, the channel
38 // is expected to connect as usual, send the queued message, and report that the
39 // handle was closed to the other side. (This message may well contain another
40 // handle, so there may well still be message pipes "on" this channel.)
41 //
42 // TODO(vtl): Figure out channel teardown.
43 struct ChannelInfo;
44 typedef base::Callback<void(ChannelInfo*)> DidCreateChannelOnIOThreadCallback;
45 MOJO_SYSTEM_IMPL_EXPORT MojoHandle CreateChannel(
46 ScopedPlatformHandle platform_handle,
47 scoped_refptr<base::TaskRunner> io_thread_task_runner,
48 DidCreateChannelOnIOThreadCallback callback);
49
50 MOJO_SYSTEM_IMPL_EXPORT void DestroyChannelOnIOThread(
51 ChannelInfo* channel_info);
52
53 } // namespace embedder
54 } // namespace mojo
55
56 #endif // MOJO_SYSTEM_EMBEDDER_H_
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