1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
|
// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MOJO_CORE_MESSAGE_PIPE_DISPATCHER_H_
#define MOJO_CORE_MESSAGE_PIPE_DISPATCHER_H_
#include <stdint.h>
#include <memory>
#include <queue>
#include "base/macros.h"
#include "base/optional.h"
#include "mojo/core/atomic_flag.h"
#include "mojo/core/dispatcher.h"
#include "mojo/core/ports/port_ref.h"
#include "mojo/core/watcher_set.h"
namespace mojo {
namespace core {
class NodeController;
class MessagePipeDispatcher : public Dispatcher {
public:
// Constructs a MessagePipeDispatcher permanently tied to a specific port.
// |connected| must indicate the state of the port at construction time; if
// the port is initialized with a peer, |connected| must be true. Otherwise it
// must be false.
//
// A MessagePipeDispatcher may not be transferred while in a disconnected
// state, and one can never return to a disconnected once connected.
//
// |pipe_id| is a unique identifier which can be used to track pipe endpoints
// as they're passed around. |endpoint| is either 0 or 1 and again is only
// used for tracking pipes (one side is always 0, the other is always 1.)
MessagePipeDispatcher(NodeController* node_controller,
const ports::PortRef& port,
uint64_t pipe_id,
int endpoint);
// Fuses this pipe with |other|. Returns |true| on success or |false| on
// failure. Regardless of the return value, both dispatchers are closed by
// this call.
bool Fuse(MessagePipeDispatcher* other);
// Dispatcher:
Type GetType() const override;
MojoResult Close() override;
MojoResult WriteMessage(
std::unique_ptr<ports::UserMessageEvent> message) override;
MojoResult ReadMessage(
std::unique_ptr<ports::UserMessageEvent>* message) override;
MojoResult SetQuota(MojoQuotaType type, uint64_t limit) override;
MojoResult QueryQuota(MojoQuotaType type,
uint64_t* limit,
uint64_t* usage) override;
HandleSignalsState GetHandleSignalsState() const override;
MojoResult AddWatcherRef(const scoped_refptr<WatcherDispatcher>& watcher,
uintptr_t context) override;
MojoResult RemoveWatcherRef(WatcherDispatcher* watcher,
uintptr_t context) override;
void StartSerialize(uint32_t* num_bytes,
uint32_t* num_ports,
uint32_t* num_handles) override;
bool EndSerialize(void* destination,
ports::PortName* ports,
PlatformHandle* handles) override;
bool BeginTransit() override;
void CompleteTransitAndClose() override;
void CancelTransit() override;
static scoped_refptr<Dispatcher> Deserialize(const void* data,
size_t num_bytes,
const ports::PortName* ports,
size_t num_ports,
PlatformHandle* handles,
size_t num_handles);
private:
class PortObserverThunk;
friend class PortObserverThunk;
~MessagePipeDispatcher() override;
MojoResult CloseNoLock();
HandleSignalsState GetHandleSignalsStateNoLock() const;
void OnPortStatusChanged();
// These are safe to access from any thread without locking.
NodeController* const node_controller_;
const ports::PortRef port_;
const uint64_t pipe_id_;
const int endpoint_;
// Guards access to all the fields below.
mutable base::Lock signal_lock_;
// This is not the same is |port_transferred_|. It's only held true between
// BeginTransit() and Complete/CancelTransit().
AtomicFlag in_transit_;
bool port_transferred_ = false;
AtomicFlag port_closed_;
WatcherSet watchers_;
base::Optional<uint64_t> receive_queue_length_limit_;
base::Optional<uint64_t> receive_queue_memory_size_limit_;
DISALLOW_COPY_AND_ASSIGN(MessagePipeDispatcher);
};
} // namespace core
} // namespace mojo
#endif // MOJO_CORE_MESSAGE_PIPE_DISPATCHER_H_
|
