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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/time.h> //for gettimeofday and timeval
#include <sys/times.h> //for times
# include <unistd.h>
namespace boost
{
namespace chrono
{
namespace chrono_detail
{
inline long 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
{
#if 0
tms tm;
clock_t c = ::times(&tm);
if (c == clock_t(-1)) // error
{
BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
} else
{
long factor = chrono_detail::tick_factor();
if (factor != -1)
{
return time_point(nanoseconds(c * factor));
} else
{
BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
}
}
return time_point();
#else
clock_t c = ::clock();
if (c == clock_t(-1)) // error
{
BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
}
return time_point(
duration(c*(1000000000l/CLOCKS_PER_SEC))
);
#endif
}
#if !defined BOOST_CHRONO_DONT_PROVIDE_HYBRID_ERROR_HANDLING
process_real_cpu_clock::time_point process_real_cpu_clock::now(system::error_code & ec)
{
#if 0
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
{
long factor = chrono_detail::tick_factor();
if (factor != -1)
{
if (!BOOST_CHRONO_IS_THROWS(ec))
{
ec.clear();
}
return time_point(nanoseconds(c * 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();
}
}
}
#else
clock_t c = ::clock();
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();
}
}
return time_point(
duration(c*(1000000000l/CLOCKS_PER_SEC))
);
#endif
}
#endif
#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
{
long factor = chrono_detail::tick_factor();
if (factor != -1)
{
if (!BOOST_CHRONO_IS_THROWS(ec))
{
ec.clear();
}
return time_point(nanoseconds((tm.tms_utime + tm.tms_cutime) * 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_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
{
long factor = chrono_detail::tick_factor();
if (factor != -1)
{
return time_point(nanoseconds((tm.tms_utime + tm.tms_cutime)
* factor));
} else
{
BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
}
}
return time_point();
}
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");
} else
{
long factor = chrono_detail::tick_factor();
if (factor != -1)
{
return time_point(nanoseconds((tm.tms_stime + tm.tms_cstime)
* 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
{
long factor = chrono_detail::tick_factor();
if (factor != -1)
{
if (!BOOST_CHRONO_IS_THROWS(ec))
{
ec.clear();
}
return time_point(nanoseconds((tm.tms_stime + tm.tms_cstime) * 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
{
long 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
{
long 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
{
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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