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// boost cpu_timer.cpp ---------------------------------------------------------------//

// Copyright Beman Dawes 1994-2006, 2011

// Distributed under the Boost Software License, Version 1.0. (See accompanying

// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

// See http://www.boost.org/libs/timer for documentation.

//--------------------------------------------------------------------------------------//

// define BOOST_TIMER_SOURCE so that <boost/timer/config.hpp> knows

// the library is being built (possibly exporting rather than importing code)

#ifndef BOOST_TIMER_SOURCE

# define BOOST_TIMER_SOURCE

#endif

#include <boost/timer/timer.hpp>

#include <boost/io/ios_state.hpp>

#include <boost/predef.h>

#include <boost/config.hpp>

#include <cstring>

#include <sstream>

#include <cassert>

#if defined(_WIN32)

# include <windows.h>

#else

# include <unistd.h>

# include <sys/times.h>

#endif

using boost::timer::nanosecond_type;

using boost::timer::cpu_times;

namespace

{

void show_time(const cpu_times& times,

std::ostream& os, const std::string& fmt, short places)

// NOTE WELL: Will truncate least-significant digits to LDBL_DIG, which may

// be as low as 10, although will be 15 for many common platforms.

{

if (places > 9)

places = 9;

else if (places < 0)

places = boost::timer::default_places;

boost::io::ios_flags_saver ifs(os);

boost::io::ios_precision_saver ips(os);

os.setf(std::ios_base::fixed, std::ios_base::floatfield);

os.precision(places);

const double sec = 1000000000.0L;

nanosecond_type total = times.system + times.user;

double wall_sec = static_cast<double>(times.wall) / sec;

double total_sec = static_cast<double>(total) / sec;

for (const char* format = fmt.c_str(); *format; ++format)

{

if (*format != '%' || !*(format+1) || !std::strchr("wustp", *(format+1)))

os << *format; // anything except % followed by a valid format character

// gets sent to the output stream

else

{

++format;

switch (*format)

{

case 'w':

os << wall_sec;

break;

case 'u':

os << static_cast<double>(times.user) / sec;

break;

case 's':

os << static_cast<double>(times.system) / sec;

break;

case 't':

os << total_sec;

break;

case 'p':

os.precision(1);

if (wall_sec > 0.001L && total_sec > 0.001L)

os << (total_sec/wall_sec) * 100.0;

else

os << "n/a";

os.precision(places);

break;

}

#if defined(_WIN32)

boost::long_long_type query_performance_frequency()

{

LARGE_INTEGER li;

::QueryPerformanceFrequency( &li ); // never fails

return li.QuadPart;

}

void get_cpu_times( boost::timer::cpu_times& current )

{

static const boost::long_long_type freq = query_performance_frequency();

LARGE_INTEGER li;

::QueryPerformanceCounter( &li ); // never fails

boost::long_long_type ctr = li.QuadPart;

boost::long_long_type const nano = INT64_C( 1000000000 ); // ns

// ctr * nano / freq, but with less overflow

boost::long_long_type whole = (ctr / freq) * nano;

boost::long_long_type part = (ctr % freq) * nano / freq;

current.wall = whole + part;

current.user = boost::timer::nanosecond_type( -1 );

current.system = boost::timer::nanosecond_type( -1 );

#if BOOST_PLAT_WINDOWS_DESKTOP

FILETIME creation, exit, kernel, user;

if( !::GetProcessTimes( ::GetCurrentProcess(), &creation, &exit, &kernel, &user ) )

{

return;

}

// Windows uses 100 nanosecond ticks

current.system = ( ( boost::timer::nanosecond_type( kernel.dwHighDateTime ) << 32 ) + kernel.dwLowDateTime ) * 100;

current.user = ( ( boost::timer::nanosecond_type( user.dwHighDateTime ) << 32 ) + user.dwLowDateTime ) * 100;

#endif

}

#else

// multiplier to convert ticks to nanoseconds; -1 if unknown

boost::int_least64_t tick_factor()

{

boost::int_least64_t tf = ::sysconf( _SC_CLK_TCK );

if( tf <= 0 ) return -1;

tf = INT64_C( 1000000000 ) / tf; // compute factor

if( tf == 0 ) tf = -1;

return tf;

}

void get_cpu_times( boost::timer::cpu_times& current )

{

current.wall = boost::timer::nanosecond_type( -1 );

current.user = boost::timer::nanosecond_type( -1 );

current.system = boost::timer::nanosecond_type( -1 );

static boost::int_least64_t tf = tick_factor();

if( tf == -1 ) return;

tms tm;

clock_t c = ::times( &tm );

if( c == static_cast<clock_t>( -1 ) ) return;

current.wall = boost::timer::nanosecond_type( c ) * tf;

current.system = boost::timer::nanosecond_type( tm.tms_stime + tm.tms_cstime ) * tf;

current.user = boost::timer::nanosecond_type( tm.tms_utime + tm.tms_cutime ) * tf;

}

#endif

// CAUTION: must be identical to same constant in auto_timers_construction.cpp

const std::string default_fmt(" %ws wall, %us user + %ss system = %ts CPU (%p%)\n");

} // unnamed namespace

namespace boost

{

namespace timer

{

// format ------------------------------------------------------------------------//

BOOST_TIMER_DECL

std::string format(const cpu_times& times, short places, const std::string& fmt)

{

std::stringstream ss;

ss.exceptions(std::ios_base::badbit | std::ios_base::failbit);

show_time(times, ss, fmt, places);

return ss.str();

}

BOOST_TIMER_DECL

std::string format(const cpu_times& times, short places)

{

return format(times, places, default_fmt);

}

// cpu_timer ---------------------------------------------------------------------//

void cpu_timer::start() BOOST_NOEXCEPT

{

m_is_stopped = false;

get_cpu_times(m_times);

}

void cpu_timer::stop() BOOST_NOEXCEPT

{

if (is_stopped())

return;

m_is_stopped = true;

cpu_times current;

get_cpu_times(current);

m_times.wall = (current.wall - m_times.wall);

m_times.user = (current.user - m_times.user);

m_times.system = (current.system - m_times.system);

}

cpu_times cpu_timer::elapsed() const BOOST_NOEXCEPT

{

if (is_stopped())

return m_times;

cpu_times current;

get_cpu_times(current);

current.wall -= m_times.wall;

current.user -= m_times.user;

current.system -= m_times.system;

return current;

}

void cpu_timer::resume() BOOST_NOEXCEPT

{

if (is_stopped())

{

cpu_times current (m_times);

start();

m_times.wall -= current.wall;

m_times.user -= current.user;

m_times.system -= current.system;

}

// auto_cpu_timer ----------------------------------------------------------------//

auto_cpu_timer::auto_cpu_timer(std::ostream& os, short places) // #5

: m_places(places), m_os(&os), m_format(default_fmt)

{

start();

}

void auto_cpu_timer::report()

{

show_time(elapsed(), ostream(), format_string(), places());

}

auto_cpu_timer::~auto_cpu_timer()

{

if (!is_stopped())

{

stop(); // the sooner we stop(), the better

#ifndef BOOST_NO_EXCEPTIONS

try

{

#endif

report();

#ifndef BOOST_NO_EXCEPTIONS

}

catch (...) // eat any exceptions

{

}

#endif

}

} // namespace timer

} // namespace boost

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