forked from boostorg/endian
133 lines
3.2 KiB
C++
133 lines
3.2 KiB
C++
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// boost run_timer.cpp -----------------------------------------------------//
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// Copyright Beman Dawes 1994-2006
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// Distributed under the Boost Software License, Version 1.0.
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// See http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org/libs/system for documentation.
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//----------------------------------------------------------------------------//
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// define BOOST_ENDIAN_SOURCE so that <boost/endian/detail/config.hpp> knows
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// the library is being built (possibly exporting rather than importing code)
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#define BOOST_ENDIAN_SOURCE
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#include <boost/endian/support/timer.hpp>
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#include <boost/system/system_error.hpp>
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#include <boost/io/ios_state.hpp>
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#include <boost/throw_exception.hpp>
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#include <boost/cerrno.hpp>
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#include <cstring>
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#include <cassert>
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using boost::endian::microsecond_t;
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using boost::endian::times_t;
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using boost::system::error_code;
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# if defined(BOOST_WINDOWS_API)
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# include <windows.h>
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# elif defined(BOOST_POSIX_API)
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# include <sys/times.h>
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# else
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# error unknown API
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# endif
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namespace
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{
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const char * default_format =
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" %ws wall, %us user + %ss system = %ts cpu (%p%)\n";
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void show_time(const char * format, int places, std::ostream& os,
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const times_t& times)
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// NOTE WELL: Will truncate least-significant digits to LDBL_DIG, which may
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// be as low as 10, although will be 15 for many common platforms.
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{
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if (times.wall < microsecond_t(0))
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return;
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if (places > 6)
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places = 6;
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else if (places < 0)
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places = 0;
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boost::io::ios_flags_saver ifs(os);
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boost::io::ios_precision_saver ips(os);
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os.setf(std::ios_base::fixed, std::ios_base::floatfield);
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os.precision(places);
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const long double sec = 1000000.0L;
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microsecond_t total = times.system + times.user;
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long double wall_sec = times.wall / sec;
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long double total_sec = total / sec;
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for (; *format; ++format)
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{
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if (*format != '%' || !*(format+1) || !std::strchr("wustp", *(format+1)))
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os << *format;
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else
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{
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++format;
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switch (*format)
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{
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case 'w':
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os << times.wall / sec;
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break;
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case 'u':
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os << times.user / sec;
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break;
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case 's':
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os << times.system / sec;
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break;
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case 't':
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os << total / sec;
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break;
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case 'p':
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os.precision(1);
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if (wall_sec > 0.001L && total_sec > 0.001L)
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os << (total_sec/wall_sec) * 100.0;
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else
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os << "n/a";
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os.precision(places);
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break;
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default:
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assert(0);
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}
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}
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}
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}
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} // unnamed namespace
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namespace boost
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{
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namespace endian
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{
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// run_timer:: report --------------------------------------//
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void run_timer::report()
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{
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show_time(!m_format
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? default_format
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: m_format,
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m_places, m_os, this->stop());
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}
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error_code run_timer::report(error_code& ec)
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{
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try
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{
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report();
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ec = error_code();
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}
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catch (...) // eat any exceptions
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{
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ec = error_code(EIO, system::generic_category());
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}
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return ec;
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}
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} // namespace endian
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} // namespace boost
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