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static const char rcsid[] = "$Id: Clock.cpp,v 1.5 2001/04/10 14:39:09 bastiaan Exp $";
/*
* See the COPYING file for the terms of usage and distribution.
*/
#include <stdlib.h>
#include <sys/time.h> // for struct timeval
#ifdef __osf__
# include <machine/builtins.h> // for __RPCC()
#elif defined(__linux__) && defined(__i386__)
# include <asm/msr.h> // for rdtscl()
#endif
#include <iostream>
#include "Clock.hh"
namespace
{
const usec_t UsecPerSec = INT64_CONSTANT(1000000);
}
bool Clock::UsingCPU = ::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 defined(__linux__) && defined(__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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