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1 // Copyright 2017 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_PUBLIC_CPP_SYSTEM_HANDLE_SIGNALS_STATE_H_ | |
6 #define MOJO_PUBLIC_CPP_SYSTEM_HANDLE_SIGNALS_STATE_H_ | |
7 | |
8 #include "mojo/public/c/system/types.h" | |
9 #include "mojo/public/cpp/system/system_export.h" | |
10 | |
11 namespace mojo { | |
12 | |
13 // A convenience wrapper around the MojoHandleSignalsState struct. | |
14 struct MOJO_CPP_SYSTEM_EXPORT HandleSignalsState final | |
15 : public MojoHandleSignalsState { | |
16 HandleSignalsState() { | |
17 satisfied_signals = MOJO_HANDLE_SIGNAL_NONE; | |
18 satisfiable_signals = MOJO_HANDLE_SIGNAL_NONE; | |
19 } | |
20 | |
21 HandleSignalsState(MojoHandleSignals satisfied, | |
22 MojoHandleSignals satisfiable) { | |
23 satisfied_signals = satisfied; | |
24 satisfiable_signals = satisfiable; | |
25 } | |
26 | |
27 bool operator==(const HandleSignalsState& other) const { | |
28 return satisfied_signals == other.satisfied_signals && | |
29 satisfiable_signals == other.satisfiable_signals; | |
30 } | |
31 | |
32 // TODO(rockot): Remove this in favor of operator==. | |
33 bool equals(const HandleSignalsState& other) const { | |
34 return satisfied_signals == other.satisfied_signals && | |
35 satisfiable_signals == other.satisfiable_signals; | |
36 } | |
37 | |
38 bool satisfies(MojoHandleSignals signals) const { | |
39 return !!(satisfied_signals & signals); | |
40 } | |
41 | |
42 bool can_satisfy(MojoHandleSignals signals) const { | |
43 return !!(satisfiable_signals & signals); | |
44 } | |
45 | |
46 // The handle is currently readable. May apply to a message pipe handle or | |
47 // data pipe consumer handle. | |
48 bool readable() const { return satisfies(MOJO_HANDLE_SIGNAL_READABLE); } | |
49 | |
50 // The handle is currently writable. May apply to a message pipe handle or | |
51 // data pipe producer handle. | |
52 bool writable() const { return satisfies(MOJO_HANDLE_SIGNAL_WRITABLE); } | |
53 | |
54 // The handle's peer is closed. May apply to any message pipe or data pipe | |
55 // handle. | |
56 bool peer_closed() const { return satisfies(MOJO_HANDLE_SIGNAL_PEER_CLOSED); } | |
57 | |
58 // The handle will never be |readable()| again. | |
59 bool never_readable() const { | |
60 return !can_satisfy(MOJO_HANDLE_SIGNAL_READABLE); | |
61 } | |
62 | |
63 // The handle will never be |writable()| again. | |
64 bool never_writable() const { | |
65 return !can_satisfy(MOJO_HANDLE_SIGNAL_WRITABLE); | |
66 } | |
67 | |
68 // The handle can never indicate |peer_closed()|. Never true for message pipe | |
69 // or data pipe handles (they can always signal peer closure), but always true | |
70 // for other types of handles (they have no peer.) | |
71 bool never_peer_closed() const { | |
72 return !can_satisfy(MOJO_HANDLE_SIGNAL_PEER_CLOSED); | |
73 } | |
74 | |
75 // (Copy and assignment allowed.) | |
76 }; | |
77 | |
78 static_assert(sizeof(HandleSignalsState) == sizeof(MojoHandleSignalsState), | |
79 "HandleSignalsState should add no overhead"); | |
80 | |
81 } // namespace mojo | |
82 | |
83 #endif // MOJO_PUBLIC_CPP_SYSTEM_HANDLE_SIGNALS_STATE_H_ | |
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