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
|
/*
Copyright (C) 2014 Carl Hetherington <cth@carlh.net>
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef DCPOMATIC_SAFE_STRINGSTREAM_H
#define DCPOMATIC_SAFE_STRINGSTREAM_H
#include <boost/thread/mutex.hpp>
/* I've not been able to reproduce it, but there have been reports that DCP-o-matic crashes
* on OS X with two simultaneous backtraces that look like this:
*
* 0 libSystem.B.dylib 0x00007fff84ebe264 __numeric_load_locale + 125
* 1 libSystem.B.dylib 0x00007fff84e2aac4 loadlocale + 323
* 2 libstdc++.6.dylib 0x00007fff8976ba69 std::__convert_from_v(int* const&, char*, int, char const*, ...) + 199
* 3 libstdc++.6.dylib 0x00007fff8974e99b std::ostreambuf_iterator<char, std::char_traits<char> > std::num_put<char, std::ostreambuf_iterator<char,
std::char_traits<char> > >::_M_insert_float<double>(std::ostreambuf_iterator<char, std::char_traits<char> >, std::ios_base&, char, char, double) const + 199
* 4 libstdc++.6.dylib 0x00007fff8974ebc0 std::num_put<char, std::ostreambuf_iterator<char, std::char_traits<char> >
>::do_put(std::ostreambuf_iterator<char, std::char_traits<char> >, std::ios_base&, char, double) const + 28
* 5 libstdc++.6.dylib 0x00007fff897566a2 std::ostream& std::ostream::_M_insert<double>(double) + 178
* 6 libdcpomatic.dylib 0x0000000100331e21 StringPrivate::Composition& StringPrivate::Composition::arg<float>(float const&) + 33
*
* in two different threads. I'm assuming that for some bizarre reason it is unsafe to use two separate stringstream
* objects in different threads on OS X. This is a hack to work around it.
*/
class SafeStringStream
{
public:
SafeStringStream ()
{}
SafeStringStream (std::string s)
: _stream (s)
{}
template <class T>
std::ostream& operator<< (T val)
{
boost::mutex::scoped_lock lm (_mutex);
_stream << val;
return _stream;
}
template <class T>
std::istream& operator>> (T& val)
{
boost::mutex::scoped_lock lm (_mutex);
_stream >> val;
return _stream;
}
std::string str () const {
return _stream.str ();
}
void str (std::string const & s) {
_stream.str (s);
}
void imbue (std::locale const & loc)
{
boost::mutex::scoped_lock lm (_mutex);
_stream.imbue (loc);
}
void width (int w)
{
_stream.width (w);
}
void fill (int f)
{
_stream.fill (f);
}
void precision (int p)
{
_stream.precision (p);
}
bool good () const
{
return _stream.good ();
}
std::string getline ()
{
boost::mutex::scoped_lock lm (_mutex);
std::string s;
std::getline (_stream, s);
return s;
}
void setf (std::ios_base::fmtflags flags, std::ios_base::fmtflags mask)
{
_stream.setf (flags, mask);
}
private:
static boost::mutex _mutex;
std::stringstream _stream;
};
#endif
|
