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1 // Copyright 2013 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_EDK_SYSTEM_AWAKABLE_H_ | |
6 #define MOJO_EDK_SYSTEM_AWAKABLE_H_ | |
7 | |
8 #include <stdint.h> | |
9 | |
10 #include "mojo/edk/system/system_impl_export.h" | |
11 #include "mojo/public/c/system/types.h" | |
12 | |
13 namespace mojo { | |
14 namespace system { | |
15 | |
16 // An interface that may be waited on |AwakableList|. | |
17 class MOJO_SYSTEM_IMPL_EXPORT Awakable { | |
18 public: | |
19 // |Awake()| must satisfy the following contract: | |
20 // * As this is called from any thread, this must be thread-safe. | |
21 // * As this is called inside a lock, this must not call anything that takes | |
22 // "non-terminal" locks, i.e., those which are always safe to take. | |
23 // This should return false if this must not be called again for the same | |
24 // reason (e.g., for the same call to |AwakableList::Add()|). | |
25 virtual bool Awake(MojoResult result, uintptr_t context) = 0; | |
26 | |
27 protected: | |
28 Awakable() {} | |
29 }; | |
30 | |
31 } // namespace system | |
32 } // namespace mojo | |
33 | |
34 #endif // MOJO_EDK_SYSTEM_AWAKABLE_H_ | |
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