/usr/include/mia-2.4/mia/core/threadedmsg.hh is in libmia-2.4-dev 2.4.3-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | /* -*- mia-c++ -*-
*
* This file is part of MIA - a toolbox for medical image analysis
* Copyright (c) Leipzig, Madrid 1999-2016 Gert Wollny
*
* MIA 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 3 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 MIA; if not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef mia_core_threadedmsg_hh
#define mia_core_threadedmsg_hh
#include <ostream>
#include <mia/core/defines.hh>
NS_MIA_BEGIN
/**
\ingroup logging
\brief This class is used to handle syncronizized output of logging output in a multi-threaded environment
This class is used to syncronize the output of the logging stream cverb and its
helper functions cvmsg(), cvdebug(), cverror(), cvwarning() ...
To use it, just declare a variable of type CThreadMsgStream at the beginning of the
threaded function.
Output is only written to the master output stream if a newline is sent or explicit
syncronization via flush() is requested.
Note, that a CThreadMsgStream itself can not serve as master stream since it would deadlock.
*/
class EXPORT_CORE CThreadMsgStream : public std::ostream {
public:
/**
Constructor. This constructor sets the thread-local output of the vstream backend to itself
and saves to old output.
*/
CThreadMsgStream();
/**
Destructor. This destructor flushes the output and then resets the thread-local vstream backend to the
original output.
*/
~CThreadMsgStream();
/**
Set the master output stream. The default is std::cerr.
\param master the new master output stream;
\remark if the new master is of type CThreadMsgStream a deadlock is certain.
*/
template <typename OS>
static void set_master_stream(OS& master);
private:
template <typename OS, typename placeholder> friend struct __dispatch_set_master_stream;
static void do_set_master_stream(std::ostream& master);
std::ostream& m_old;
};
/**
@cond INTERNAL
\ingroup traits
\brief Structure to ensure the sane initialization of CThreadMsgStream
This structure is used to capture and report an error when a developer tries
to use a CThreadMsgStream as master stream.
\tparam OS the output stream type to be used as master stream
\tparam placeholder additional type to make sure the static_assert is only triggered if
OS==CThreadMsgStream
*/
template <typename OS, typename placeholder>
struct __dispatch_set_master_stream {
static void apply(OS &master){
CThreadMsgStream::do_set_master_stream(master);
}
};
template <typename placeholder>
struct __dispatch_set_master_stream<CThreadMsgStream, placeholder> {
static void apply(CThreadMsgStream& /*master*/){
static_assert(sizeof(placeholder) == 0,
"CThreadMsgStream can't be used as master stream because it would deadlock.");
}
};
/// @endcond
template <typename OS>
void CThreadMsgStream::set_master_stream(OS& master)
{
__dispatch_set_master_stream<OS, int>::apply(master);
}
NS_MIA_END
#endif
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