cds/os/aix/timer.h

   1 //$$CDS-header$$
   2
   3 #ifndef __CDS_OS_AIX_TIMER_H
   4 #define __CDS_OS_AIX_TIMER_H
   5
   6 // Source: http://publib16.boulder.ibm.com/doc_link/en_US/a_doc_lib/libs/basetrf2/read_real_time.htm
   7
   8 #ifndef __CDS_OS_TIMER_H
   9 #   error "<cds/os/timer.h> must be included"
  10 #endif
  11
  12 #include <sys/time.h>
  13 #include <sys/systemcfg.h>
  14
  15 //@cond none
  16 namespace cds { namespace OS {
  17     CDS_CXX11_INLINE_NAMESPACE namespace Aix {
  18
  19         // High resolution timer
  20         class Timer {
  21             timebasestruct_t    m_tmStart;
  22
  23         protected:
  24             static unsigned long long nano( native_timer_type const& nStart, native_timer_type const& nEnd )
  25             {
  26                 return (((unsigned long long) (nEnd.tb_high - nStart.tb_high)) << 32) + (nEnd.tb_low - nStart.tb_low);
  27             }
  28
  29         public:
  30             typedef timebasestruct_t    native_timer_type;
  31             typedef long long            native_duration_type;
  32
  33             Timer() : m_tmStart( current() ) {}
  34
  35             static native_timer_type    current()
  36             {
  37                 native_timer_type tm;
  38                 current( &tm );
  39                 return tm;
  40             }
  41             static void current( native_timer_type& tmr )
  42             {
  43                 read_real_time( &tmr, sizeof(tmr) );
  44                 time_base_to_time( &tmr, sizeof(tmr ));
  45             }
  46
  47             double reset()
  48             {
  49                 native_timer_type tt;
  50                 current( tt );
  51                 double ret = nano( m_tmStart, tt ) / 1.0E9;
  52                 m_tmStart = tt;
  53                 return ret;
  54             }
  55
  56             double duration( native_duration_type dur )
  57             {
  58                 return double( dur ) / 1.0E9;
  59             }
  60
  61             double duration()
  62             {
  63                 return duration( native_duration() );
  64             }
  65
  66             native_duration_type    native_duration()
  67             {
  68                 return native_duration( m_tmStart, current() );
  69             }
  70
  71             static native_duration_type    native_duration( native_timer_type const & nStart, native_timer_type const & nEnd )
  72             {
  73                 return nano( nStart, nEnd );
  74             }
  75
  76             static unsigned long long random_seed()
  77             {
  78                 native_timer_type tmr;
  79                 read_real_time( &tmr, sizeof(tmr) );
  80                 return ( ((unsigned long long)(tmr.tb_hight)) << 32 ) + tmr.tb_low;
  81             }
  82         };
  83     }    // namespace Aix
  84
  85 #ifndef CDS_CXX11_INLINE_NAMESPACE_SUPPORT
  86     typedef Aix::Timer    Timer;
  87 #endif
  88
  89 }}   // namespace cds::OS
  90 //@endcond
  91
  92 #endif // #ifndef __CDS_OS_AIX_TIMER_H