1 | /* |
2 | * Copyright (C) 2018 Apple Inc. All rights reserved. |
3 | * |
4 | * Redistribution and use in source and binary forms, with or without |
5 | * modification, are permitted provided that the following conditions |
6 | * are met: |
7 | * 1. Redistributions of source code must retain the above copyright |
8 | * notice, this list of conditions and the following disclaimer. |
9 | * 2. Redistributions in binary form must reproduce the above copyright |
10 | * notice, this list of conditions and the following disclaimer in the |
11 | * documentation and/or other materials provided with the distribution. |
12 | * |
13 | * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' |
14 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
15 | * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
16 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS |
17 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
18 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
19 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
20 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
21 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
22 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
23 | * THE POSSIBILITY OF SUCH DAMAGE. |
24 | */ |
25 | |
26 | #include "config.h" |
27 | #include "MessagePortChannelProvider.h" |
28 | |
29 | #include "MessagePortChannelProviderImpl.h" |
30 | #include <wtf/MainThread.h> |
31 | |
32 | namespace WebCore { |
33 | |
34 | static MessagePortChannelProvider* globalProvider; |
35 | |
36 | MessagePortChannelProvider& MessagePortChannelProvider::singleton() |
37 | { |
38 | static std::once_flag onceFlag; |
39 | std::call_once(onceFlag, [] { |
40 | if (!globalProvider) |
41 | globalProvider = new MessagePortChannelProviderImpl; |
42 | }); |
43 | |
44 | return *globalProvider; |
45 | } |
46 | |
47 | void MessagePortChannelProvider::setSharedProvider(MessagePortChannelProvider& provider) |
48 | { |
49 | RELEASE_ASSERT(isMainThread()); |
50 | RELEASE_ASSERT(!globalProvider); |
51 | globalProvider = &provider; |
52 | } |
53 | |
54 | } // namespace WebCore |
55 | |