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Side by Side Diff: base/mac/scoped_mach_port.h

Issue 1647803004: Move base to DEPS (Closed) Base URL: git@github.com:domokit/mojo.git@master
Patch Set: Created 4 years, 10 months ago
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1 // Copyright (c) 2012 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 BASE_MAC_SCOPED_MACH_PORT_H_
6 #define BASE_MAC_SCOPED_MACH_PORT_H_
7
8 #include <mach/mach.h>
9
10 #include "base/base_export.h"
11 #include "base/scoped_generic.h"
12
13 namespace base {
14 namespace mac {
15
16 namespace internal {
17
18 struct BASE_EXPORT SendRightTraits {
19 static mach_port_t InvalidValue() {
20 return MACH_PORT_NULL;
21 }
22
23 BASE_EXPORT static void Free(mach_port_t port);
24 };
25
26 struct BASE_EXPORT ReceiveRightTraits {
27 static mach_port_t InvalidValue() {
28 return MACH_PORT_NULL;
29 }
30
31 BASE_EXPORT static void Free(mach_port_t port);
32 };
33
34 struct PortSetTraits {
35 static mach_port_t InvalidValue() {
36 return MACH_PORT_NULL;
37 }
38
39 BASE_EXPORT static void Free(mach_port_t port);
40 };
41
42 } // namespace internal
43
44 // A scoper for handling a Mach port that names a send right. Send rights are
45 // reference counted, and this takes ownership of the right on construction
46 // and then removes a reference to the right on destruction. If the reference
47 // is the last one on the right, the right is deallocated.
48 class BASE_EXPORT ScopedMachSendRight :
49 public base::ScopedGeneric<mach_port_t, internal::SendRightTraits> {
50 public:
51 explicit ScopedMachSendRight(mach_port_t port = traits_type::InvalidValue())
52 : ScopedGeneric(port) {}
53
54 operator mach_port_t() const { return get(); }
55 };
56
57 // A scoper for handling a Mach port's receive right. There is only one
58 // receive right per port. This takes ownership of the receive right on
59 // construction and then destroys the right on destruction, turning all
60 // outstanding send rights into dead names.
61 class BASE_EXPORT ScopedMachReceiveRight :
62 public base::ScopedGeneric<mach_port_t, internal::ReceiveRightTraits> {
63 public:
64 explicit ScopedMachReceiveRight(
65 mach_port_t port = traits_type::InvalidValue()) : ScopedGeneric(port) {}
66
67 operator mach_port_t() const { return get(); }
68 };
69
70 // A scoper for handling a Mach port set. A port set can have only one
71 // reference. This takes ownership of that single reference on construction and
72 // destroys the port set on destruction. Destroying a port set does not destroy
73 // the receive rights that are members of the port set.
74 class BASE_EXPORT ScopedMachPortSet :
75 public ScopedGeneric<mach_port_t, internal::PortSetTraits> {
76 public:
77 explicit ScopedMachPortSet(mach_port_t port = traits_type::InvalidValue())
78 : ScopedGeneric(port) {}
79
80 operator mach_port_t() const { return get(); }
81 };
82
83 } // namespace mac
84 } // namespace base
85
86 #endif // BASE_MAC_SCOPED_MACH_PORT_H_
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