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
164
|
/*
* Copyright 2003-2017 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "ThreadInputStream.hxx"
#include "thread/Name.hxx"
#include "util/CircularBuffer.hxx"
#include "util/HugeAllocator.hxx"
#include <assert.h>
#include <string.h>
void
ThreadInputStream::Stop() noexcept
{
if (!thread.IsDefined())
return;
{
const std::lock_guard<Mutex> lock(mutex);
close = true;
wake_cond.signal();
}
Cancel();
thread.Join();
if (buffer != nullptr) {
buffer->Clear();
HugeFree(buffer->Write().data, buffer_size);
delete buffer;
buffer = nullptr;
}
}
void
ThreadInputStream::Start()
{
assert(buffer == nullptr);
void *p = HugeAllocate(buffer_size);
assert(p != nullptr);
buffer = new CircularBuffer<uint8_t>((uint8_t *)p, buffer_size);
thread.Start();
}
void
ThreadInputStream::ThreadFunc()
{
FormatThreadName("input:%s", plugin);
const std::lock_guard<Mutex> lock(mutex);
try {
Open();
} catch (...) {
postponed_exception = std::current_exception();
SetReady();
return;
}
/* we're ready, tell it to our client */
SetReady();
while (!close) {
assert(!postponed_exception);
auto w = buffer->Write();
if (w.IsEmpty()) {
wake_cond.wait(mutex);
} else {
size_t nbytes;
try {
const ScopeUnlock unlock(mutex);
nbytes = ThreadRead(w.data, w.size);
} catch (...) {
postponed_exception = std::current_exception();
cond.broadcast();
break;
}
cond.broadcast();
if (nbytes == 0) {
eof = true;
break;
}
buffer->Append(nbytes);
}
}
Close();
}
void
ThreadInputStream::Check()
{
assert(!thread.IsInside());
if (postponed_exception)
std::rethrow_exception(postponed_exception);
}
bool
ThreadInputStream::IsAvailable() noexcept
{
assert(!thread.IsInside());
return !buffer->IsEmpty() || eof || postponed_exception;
}
inline size_t
ThreadInputStream::Read(void *ptr, size_t read_size)
{
assert(!thread.IsInside());
while (true) {
if (postponed_exception)
std::rethrow_exception(postponed_exception);
auto r = buffer->Read();
if (!r.IsEmpty()) {
size_t nbytes = std::min(read_size, r.size);
memcpy(ptr, r.data, nbytes);
buffer->Consume(nbytes);
wake_cond.broadcast();
offset += nbytes;
return nbytes;
}
if (eof)
return 0;
cond.wait(mutex);
}
}
bool
ThreadInputStream::IsEOF() noexcept
{
assert(!thread.IsInside());
return eof;
}
|
