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// Copyright (c) 2006-2018 Maxim Khizhinsky
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef CDSLIB_OS_AIX_TIMER_H
#define CDSLIB_OS_AIX_TIMER_H
// Source: http://publib16.boulder.ibm.com/doc_link/en_US/a_doc_lib/libs/basetrf2/read_real_time.htm
#ifndef CDSLIB_OS_TIMER_H
# error "<cds/os/timer.h> must be included"
#endif
#include <sys/time.h>
#include <sys/systemcfg.h>
//@cond none
namespace cds { namespace OS {
inline namespace Aix {
// High resolution timer
class Timer {
timebasestruct_t m_tmStart;
protected:
static unsigned long long nano( native_timer_type const& nStart, native_timer_type const& nEnd )
{
return (((unsigned long long) (nEnd.tb_high - nStart.tb_high)) << 32) + (nEnd.tb_low - nStart.tb_low);
}
public:
typedef timebasestruct_t native_timer_type;
typedef long long native_duration_type;
Timer() : m_tmStart( current()) {}
static native_timer_type current()
{
native_timer_type tm;
current( &tm );
return tm;
}
static void current( native_timer_type& tmr )
{
read_real_time( &tmr, sizeof(tmr));
time_base_to_time( &tmr, sizeof(tmr ));
}
double reset()
{
native_timer_type tt;
current( tt );
double ret = nano( m_tmStart, tt ) / 1.0E9;
m_tmStart = tt;
return ret;
}
double duration( native_duration_type dur )
{
return double( dur ) / 1.0E9;
}
double duration()
{
return duration( native_duration());
}
native_duration_type native_duration()
{
return native_duration( m_tmStart, current());
}
static native_duration_type native_duration( native_timer_type const & nStart, native_timer_type const & nEnd )
{
return nano( nStart, nEnd );
}
static unsigned long long random_seed()
{
native_timer_type tmr;
read_real_time( &tmr, sizeof(tmr));
return ( ((unsigned long long)(tmr.tb_hight)) << 32 ) + tmr.tb_low;
}
};
} // namespace Aix
}} // namespace cds::OS
//@endcond
#endif // #ifndef CDSLIB_OS_AIX_TIMER_H
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