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static const char rcsid[] = "$Id: clock.cpp 16153 2011-03-21 08:57:31Z taurel $";
//
// Copyright (C) : 2004,2005,2006,2007,2008,2009,2010
// Synchrotron SOLEIL
// L'Orme des Merisiers
// Saint-Aubin - BP 48 - France
//
// This file is part of log4tango.
//
// Log4ango is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Log4tango 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with Log4Tango. If not, see <http://www.gnu.org/licenses/>.
#include <cstdlib>
#include <sys/time.h> // for struct timeval
#ifdef __osf__
# include <machine/builtins.h> // for __RPCC()
#elif __linux__ && __i386__
# define rdtscl(low) \
__asm__ __volatile__("rdtsc" : "=a" (low) : : "edx")
#endif
#include <iostream>
#include "clock.hh"
namespace
{
const usec_t UsecPerSec = INT64_CONSTANT(1000000);
}
bool Clock::UsingCPU = std::getenv("CLOCK_USE_CPU") ? true : false;
// -----------------------------------------------------------------------------
usec_t Clock::time(void)
{
if (UsingCPU) {
static bool warn = true;
if (warn) {
std::cout << "Using CPU clock." << std::endl;
warn = false;
}
#ifdef __osf__
return (usec_t) __RPCC();
#elif __linux__ && __i386__
{
unsigned long tsc;
rdtscl(tsc);
return (usec_t) tsc;
}
#else
{
std::cerr << "CPU clock not implemented for this architecture" << std::endl;
UsingCPU = false;
return Clock::time();
}
#endif
} else {
struct timeval tv;
gettimeofday(&tv, NULL);
return (usec_t) (tv.tv_sec * UsecPerSec + tv.tv_usec);
}
}
// -----------------------------------------------------------------------------
Clock::Clock(void)
: _start(0),
_elapsed(0),
_active(false)
{
start();
}
// -----------------------------------------------------------------------------
Clock::~Clock(void)
{
;
}
// -----------------------------------------------------------------------------
usec_t Clock::elapsed(void) const
{
if (!active())
return _elapsed;
return time() - _start;
}
// -----------------------------------------------------------------------------
usec_t Clock::start(void)
{
_active = true;
return _start = time();
}
// -----------------------------------------------------------------------------
usec_t Clock::stop(void)
{
_elapsed = elapsed();
_active = false;
return _elapsed;
}
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