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// boost process_cpu_clocks.cpp -----------------------------------------------------------//
// Copyright Beman Dawes 1994, 2006, 2008
// Copyright Vicente J. Botet Escriba 2009
// Distributed under the Boost Software License, Version 1.0.
// See http://www.boost.org/LICENSE_1_0.txt
// See http://www.boost.org/libs/chrono for documentation.
//--------------------------------------------------------------------------------------//
#include <boost/chrono/config.hpp>
#include <boost/chrono/process_cpu_clocks.hpp>
#include <boost/assert.hpp>
#include <sys/times.h>
#include <unistd.h>
#include <time.h> // for clock_gettime
namespace boost { namespace chrono {
namespace chrono_detail
{
inline nanoseconds::rep tick_factor() // multiplier to convert ticks
// to nanoseconds; -1 if unknown
{
static long factor = 0;
if ( !factor )
{
if ( (factor = ::sysconf( _SC_CLK_TCK )) <= 0 )
factor = -1;
else
{
BOOST_ASSERT( factor <= 1000000000l ); // doesn't handle large ticks
factor = 1000000000l / factor; // compute factor
if ( !factor ) factor = -1;
}
}
return factor;
}
}
process_real_cpu_clock::time_point process_real_cpu_clock::now() BOOST_NOEXCEPT
{
tms tm;
clock_t c = ::times( &tm );
if ( c == clock_t(-1) ) // error
{
BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
}
else
{
if ( chrono_detail::tick_factor() != -1 )
{
return time_point(
nanoseconds(c*chrono_detail::tick_factor()));
}
else
{
BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
}
}
return time_point();
}
#if !defined BOOST_CHRONO_DONT_PROVIDE_HYBRID_ERROR_HANDLING
process_real_cpu_clock::time_point process_real_cpu_clock::now(
system::error_code & ec)
{
tms tm;
clock_t c = ::times( &tm );
if ( c == clock_t(-1) ) // error
{
if (BOOST_CHRONO_IS_THROWS(ec))
{
boost::throw_exception(
system::system_error(
errno,
BOOST_CHRONO_SYSTEM_CATEGORY,
"chrono::process_real_cpu_clock" ));
}
else
{
ec.assign( errno, BOOST_CHRONO_SYSTEM_CATEGORY );
return time_point();
}
}
else
{
if ( chrono_detail::tick_factor() != -1 )
{
if (!BOOST_CHRONO_IS_THROWS(ec))
{
ec.clear();
}
return time_point(
nanoseconds(c*chrono_detail::tick_factor()));
}
else
{
if (BOOST_CHRONO_IS_THROWS(ec))
{
boost::throw_exception(
system::system_error(
errno,
BOOST_CHRONO_SYSTEM_CATEGORY,
"chrono::process_real_cpu_clock" ));
}
else
{
ec.assign( errno, BOOST_CHRONO_SYSTEM_CATEGORY );
return time_point();
}
}
}
}
#endif
process_user_cpu_clock::time_point process_user_cpu_clock::now() BOOST_NOEXCEPT
{
tms tm;
clock_t c = ::times( &tm );
if ( c == clock_t(-1) ) // error
{
BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
}
else
{
if ( chrono_detail::tick_factor() != -1 )
{
return time_point(
nanoseconds((tm.tms_utime + tm.tms_cutime)*chrono_detail::tick_factor()));
}
else
{
BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
}
}
return time_point();
}
#if !defined BOOST_CHRONO_DONT_PROVIDE_HYBRID_ERROR_HANDLING
process_user_cpu_clock::time_point process_user_cpu_clock::now(
system::error_code & ec)
{
tms tm;
clock_t c = ::times( &tm );
if ( c == clock_t(-1) ) // error
{
if (BOOST_CHRONO_IS_THROWS(ec))
{
boost::throw_exception(
system::system_error(
errno,
BOOST_CHRONO_SYSTEM_CATEGORY,
"chrono::process_user_cpu_clock" ));
}
else
{
ec.assign( errno, BOOST_CHRONO_SYSTEM_CATEGORY );
return time_point();
}
}
else
{
if ( chrono_detail::tick_factor() != -1 )
{
if (!BOOST_CHRONO_IS_THROWS(ec))
{
ec.clear();
}
return time_point(
nanoseconds((tm.tms_utime + tm.tms_cutime)*chrono_detail::tick_factor()));
}
else
{
if (BOOST_CHRONO_IS_THROWS(ec))
{
boost::throw_exception(
system::system_error(
errno,
BOOST_CHRONO_SYSTEM_CATEGORY,
"chrono::process_user_cpu_clock" ));
}
else
{
ec.assign( errno, BOOST_CHRONO_SYSTEM_CATEGORY );
return time_point();
}
}
}
}
#endif
process_system_cpu_clock::time_point process_system_cpu_clock::now() BOOST_NOEXCEPT
{
tms tm;
clock_t c = ::times( &tm );
if ( c == clock_t(-1) ) // error
{
BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
return time_point();
}
else
{
if ( chrono_detail::tick_factor() != -1 )
{
return time_point(
nanoseconds((tm.tms_stime + tm.tms_cstime)*chrono_detail::tick_factor()));
}
else
{
BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
return time_point();
}
}
}
#if !defined BOOST_CHRONO_DONT_PROVIDE_HYBRID_ERROR_HANDLING
process_system_cpu_clock::time_point process_system_cpu_clock::now(
system::error_code & ec)
{
tms tm;
clock_t c = ::times( &tm );
if ( c == clock_t(-1) ) // error
{
if (BOOST_CHRONO_IS_THROWS(ec))
{
boost::throw_exception(
system::system_error(
errno,
BOOST_CHRONO_SYSTEM_CATEGORY,
"chrono::process_system_cpu_clock" ));
}
else
{
ec.assign( errno, BOOST_CHRONO_SYSTEM_CATEGORY );
return time_point();
}
}
else
{
if ( chrono_detail::tick_factor() != -1 )
{
if (!BOOST_CHRONO_IS_THROWS(ec))
{
ec.clear();
}
return time_point(
nanoseconds((tm.tms_stime + tm.tms_cstime)*chrono_detail::tick_factor()));
}
else
{
if (BOOST_CHRONO_IS_THROWS(ec))
{
boost::throw_exception(
system::system_error(
errno,
BOOST_CHRONO_SYSTEM_CATEGORY,
"chrono::process_system_cpu_clock" ));
}
else
{
ec.assign( errno, BOOST_CHRONO_SYSTEM_CATEGORY );
return time_point();
}
}
}
}
#endif
process_cpu_clock::time_point process_cpu_clock::now() BOOST_NOEXCEPT
{
tms tm;
clock_t c = ::times( &tm );
if ( c == clock_t(-1) ) // error
{
BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
}
else
{
nanoseconds::rep factor = chrono_detail::tick_factor();
if ( factor != -1 )
{
time_point::rep r(
c*factor,
(tm.tms_utime + tm.tms_cutime)*factor,
(tm.tms_stime + tm.tms_cstime)*factor);
return time_point(duration(r));
}
else
{
BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
}
}
return time_point();
}
#if !defined BOOST_CHRONO_DONT_PROVIDE_HYBRID_ERROR_HANDLING
process_cpu_clock::time_point process_cpu_clock::now(
system::error_code & ec )
{
tms tm;
clock_t c = ::times( &tm );
if ( c == clock_t(-1) ) // error
{
if (BOOST_CHRONO_IS_THROWS(ec))
{
boost::throw_exception(
system::system_error(
errno,
BOOST_CHRONO_SYSTEM_CATEGORY,
"chrono::process_clock" ));
}
else
{
ec.assign( errno, BOOST_CHRONO_SYSTEM_CATEGORY );
return time_point();
}
}
else
{
if ( chrono_detail::tick_factor() != -1 )
{
time_point::rep r(
c*chrono_detail::tick_factor(),
(tm.tms_utime + tm.tms_cutime)*chrono_detail::tick_factor(),
(tm.tms_stime + tm.tms_cstime)*chrono_detail::tick_factor());
return time_point(duration(r));
}
else
{
if (BOOST_CHRONO_IS_THROWS(ec))
{
boost::throw_exception(
system::system_error(
errno,
BOOST_CHRONO_SYSTEM_CATEGORY,
"chrono::process_clock" ));
}
else
{
ec.assign( errno, BOOST_CHRONO_SYSTEM_CATEGORY );
return time_point();
}
}
}
}
#endif
} }
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