/*
===============
Sys_ClockTicksPerSecond
===============
*/
double Sys_ClockTicksPerSecond()
{
static bool init = false;
static double ret;
int fd, len, pos, end;
char buf[ 4096 ];
if( init )
{
return ret;
}
fd = open( "/proc/cpuinfo", O_RDONLY );
if( fd == -1 )
{
common->Printf( "couldn't read /proc/cpuinfo\n" );
ret = MeasureClockTicks();
init = true;
common->Printf( "measured CPU frequency: %g MHz\n", ret / 1000000.0 );
return ret;
}
len = read( fd, buf, 4096 );
close( fd );
pos = 0;
while( pos < len )
{
if( !idStr::Cmpn( buf + pos, "cpu MHz", 7 ) )
{
pos = strchr( buf + pos, ':' ) - buf + 2;
end = strchr( buf + pos, '\n' ) - buf;
if( pos < len && end < len )
{
buf[end] = '\0';
ret = atof( buf + pos );
}
else
{
common->Printf( "failed parsing /proc/cpuinfo\n" );
ret = MeasureClockTicks();
init = true;
common->Printf( "measured CPU frequency: %g MHz\n", ret / 1000000.0 );
return ret;
}
common->Printf( "/proc/cpuinfo CPU frequency: %g MHz\n", ret );
ret *= 1000000;
init = true;
return ret;
}
pos = strchr( buf + pos, '\n' ) - buf + 1;
}
common->Printf( "failed parsing /proc/cpuinfo\n" );
ret = MeasureClockTicks();
init = true;
common->Printf( "measured CPU frequency: %g MHz\n", ret / 1000000.0 );
return ret;
}
/*
===============
Sys_ClockTicksPerSecond
===============
*/
double Sys_ClockTicksPerSecond()
{
static bool init = false;
static double ret;
size_t len = sizeof( ret );
int status;
if( init )
{
return ret;
}
status = sysctlbyname( "hw.cpufrequency", &ret, &len, NULL, 0 );
if( status == -1 )
{
common->Printf( "couldn't read systclbyname\n" );
ret = MeasureClockTicks();
init = true;
common->Printf( "measured CPU frequency: %g MHz\n", ret / 1000000.0 );
return ret;
}
common->Printf( "CPU frequency: %g MHz\n", ret / 1000000.0 );
init = true;
return ret;
}
