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
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
// Copyright 2014 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.
// This file provides a C++ wrapping around the Mojo C API for data pipes,
// replacing the prefix of "Mojo" with a "mojo" namespace, and using more
// strongly-typed representations of |MojoHandle|s.
//
// Please see "mojo/public/c/system/data_pipe.h" for complete documentation of
// the API.
#ifndef MOJO_PUBLIC_CPP_SYSTEM_DATA_PIPE_H_
#define MOJO_PUBLIC_CPP_SYSTEM_DATA_PIPE_H_
#include <assert.h>
#include <stdint.h>
#include "mojo/public/c/system/data_pipe.h"
#include "mojo/public/cpp/system/handle.h"
#include "mojo/public/cpp/system/macros.h"
namespace mojo {
// A strongly-typed representation of a |MojoHandle| to the producer end of a
// data pipe.
class DataPipeProducerHandle : public Handle {
public:
DataPipeProducerHandle() {}
explicit DataPipeProducerHandle(MojoHandle value) : Handle(value) {}
// Copying and assignment allowed.
};
static_assert(sizeof(DataPipeProducerHandle) == sizeof(Handle),
"Bad size for C++ DataPipeProducerHandle");
typedef ScopedHandleBase<DataPipeProducerHandle> ScopedDataPipeProducerHandle;
static_assert(sizeof(ScopedDataPipeProducerHandle) ==
sizeof(DataPipeProducerHandle),
"Bad size for C++ ScopedDataPipeProducerHandle");
// A strongly-typed representation of a |MojoHandle| to the consumer end of a
// data pipe.
class DataPipeConsumerHandle : public Handle {
public:
DataPipeConsumerHandle() {}
explicit DataPipeConsumerHandle(MojoHandle value) : Handle(value) {}
// Copying and assignment allowed.
};
static_assert(sizeof(DataPipeConsumerHandle) == sizeof(Handle),
"Bad size for C++ DataPipeConsumerHandle");
typedef ScopedHandleBase<DataPipeConsumerHandle> ScopedDataPipeConsumerHandle;
static_assert(sizeof(ScopedDataPipeConsumerHandle) ==
sizeof(DataPipeConsumerHandle),
"Bad size for C++ ScopedDataPipeConsumerHandle");
// Creates a new data pipe. See |MojoCreateDataPipe()| for complete
// documentation.
inline MojoResult CreateDataPipe(
const MojoCreateDataPipeOptions* options,
ScopedDataPipeProducerHandle* data_pipe_producer,
ScopedDataPipeConsumerHandle* data_pipe_consumer) {
assert(data_pipe_producer);
assert(data_pipe_consumer);
DataPipeProducerHandle producer_handle;
DataPipeConsumerHandle consumer_handle;
MojoResult rv = MojoCreateDataPipe(options,
producer_handle.mutable_value(),
consumer_handle.mutable_value());
// Reset even on failure (reduces the chances that a "stale"/incorrect handle
// will be used).
data_pipe_producer->reset(producer_handle);
data_pipe_consumer->reset(consumer_handle);
return rv;
}
// Writes to a data pipe. See |MojoWriteData| for complete documentation.
inline MojoResult WriteDataRaw(DataPipeProducerHandle data_pipe_producer,
const void* elements,
uint32_t* num_bytes,
MojoWriteDataFlags flags) {
return MojoWriteData(data_pipe_producer.value(), elements, num_bytes, flags);
}
// Begins a two-phase write to a data pipe. See |MojoBeginWriteData()| for
// complete documentation.
inline MojoResult BeginWriteDataRaw(DataPipeProducerHandle data_pipe_producer,
void** buffer,
uint32_t* buffer_num_bytes,
MojoWriteDataFlags flags) {
return MojoBeginWriteData(
data_pipe_producer.value(), buffer, buffer_num_bytes, flags);
}
// Completes a two-phase write to a data pipe. See |MojoEndWriteData()| for
// complete documentation.
inline MojoResult EndWriteDataRaw(DataPipeProducerHandle data_pipe_producer,
uint32_t num_bytes_written) {
return MojoEndWriteData(data_pipe_producer.value(), num_bytes_written);
}
// Reads from a data pipe. See |MojoReadData()| for complete documentation.
inline MojoResult ReadDataRaw(DataPipeConsumerHandle data_pipe_consumer,
void* elements,
uint32_t* num_bytes,
MojoReadDataFlags flags) {
return MojoReadData(data_pipe_consumer.value(), elements, num_bytes, flags);
}
// Begins a two-phase read from a data pipe. See |MojoBeginReadData()| for
// complete documentation.
inline MojoResult BeginReadDataRaw(DataPipeConsumerHandle data_pipe_consumer,
const void** buffer,
uint32_t* buffer_num_bytes,
MojoReadDataFlags flags) {
return MojoBeginReadData(
data_pipe_consumer.value(), buffer, buffer_num_bytes, flags);
}
// Completes a two-phase read from a data pipe. See |MojoEndReadData()| for
// complete documentation.
inline MojoResult EndReadDataRaw(DataPipeConsumerHandle data_pipe_consumer,
uint32_t num_bytes_read) {
return MojoEndReadData(data_pipe_consumer.value(), num_bytes_read);
}
// A wrapper class that automatically creates a data pipe and owns both handles.
// TODO(vtl): Make an even more friendly version? (Maybe templatized for a
// particular type instead of some "element"? Maybe functions that take
// vectors?)
class DataPipe {
public:
DataPipe();
explicit DataPipe(const MojoCreateDataPipeOptions& options);
~DataPipe();
ScopedDataPipeProducerHandle producer_handle;
ScopedDataPipeConsumerHandle consumer_handle;
};
inline DataPipe::DataPipe() {
MojoResult result =
CreateDataPipe(nullptr, &producer_handle, &consumer_handle);
MOJO_ALLOW_UNUSED_LOCAL(result);
assert(result == MOJO_RESULT_OK);
}
inline DataPipe::DataPipe(const MojoCreateDataPipeOptions& options) {
MojoResult result =
CreateDataPipe(&options, &producer_handle, &consumer_handle);
MOJO_ALLOW_UNUSED_LOCAL(result);
assert(result == MOJO_RESULT_OK);
}
inline DataPipe::~DataPipe() {
}
} // namespace mojo
#endif // MOJO_PUBLIC_CPP_SYSTEM_DATA_PIPE_H_
|
