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Diffstat (limited to 'ACE/ace/High_Res_Timer.inl')
| -rw-r--r-- | ACE/ace/High_Res_Timer.inl | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/ACE/ace/High_Res_Timer.inl b/ACE/ace/High_Res_Timer.inl new file mode 100644 index 00000000000..1b37f522439 --- /dev/null +++ b/ACE/ace/High_Res_Timer.inl @@ -0,0 +1,177 @@ +// -*- C++ -*- */ +// +// $Id$ + +#include "ace/Global_Macros.h" + +#if defined (ACE_WIN32) +# include "ace/OS_NS_sys_time.h" +#endif /* ACE_WIN32 */ + +ACE_BEGIN_VERSIONED_NAMESPACE_DECL + +// Be very careful before changing the calculations inside +// ACE_High_Res_Timer. The precision matters and we are using integer +// calculations not floating point. Also look closely at the emulated 64 +// bit int class (inside Basic_Types{h,i,cpp} before changing +// anything. It's operator/ only returns 32 bits not 64 bits, among +// other things. + +ACE_INLINE void +ACE_High_Res_Timer::hrtime_to_tv (ACE_Time_Value &tv, + const ACE_hrtime_t hrt) +{ + // The following are based on the units of global_scale_factor_ + // being 1/microsecond. Therefore, dividing by it converts + // clock ticks to microseconds. + tv.sec ((long) (hrt / (ACE_UINT32) ACE_HR_SCALE_CONVERSION / + global_scale_factor ())); + + // Calculate usec in a manner that's compatible with ACE_U_LongLong. + // hrt = (tv.sec * ACE_ONE_SECOND_IN_USECS + tv.usec) * global_scale_factor_ + // tv.usec = hrt / global_scale_factor_ - tv.sec * ACE_ONE_SECOND_IN_USECS + // That first term will be lossy, so factor out global_scale_factor_: + // tv.usec = (hrt - tv.sec * ACE_ONE_SECOND_IN_USECS * global_scale_factor_)/ + // global_scale_factor + ACE_hrtime_t tmp = tv.sec (); + tmp *= ((ACE_UINT32) ACE_HR_SCALE_CONVERSION * global_scale_factor ()); +#if defined (ACE_WIN32) + // Win32's scale factor is in ticks/msec, so multiply up to usec. + ACE_hrtime_t subsec = hrt - tmp; // Remainder of ticks < 1sec + ACE_UINT32 msec = (ACE_UINT32) (subsec / global_scale_factor ()); // #msec + ACE_hrtime_t usec64 = subsec - (msec * global_scale_factor ()); +# if defined (ACE_LACKS_LONGLONG_T) + ACE_UINT32 usec = usec64.lo(); +# else + ACE_UINT32 usec = (ACE_UINT32) usec64; +# endif // ACE_LACKS_LONGLONG_T + // (tick * usec/msec) / tick/msec = usec + usec = (usec * 1000) / (ACE_UINT32) global_scale_factor (); + tv.usec ((msec * 1000) + usec); +#else + tv.usec ((long) ((hrt - tmp) / global_scale_factor ())); +#endif +} + + +ACE_INLINE ACE_Time_Value +ACE_High_Res_Timer::gettimeofday (const ACE_OS::ACE_HRTimer_Op op) +{ +#if defined (ACE_WIN32) + // Get the global scale factor if there isn't one yet. + if (ACE_High_Res_Timer::global_scale_factor_status_ == 0) + ACE_High_Res_Timer::global_scale_factor (); + + // If there isn't a high-res timer, use gettimeofday (); + if (ACE_High_Res_Timer::global_scale_factor_status_ == -1) + return ACE_OS::gettimeofday (); +#endif /* ACE_WIN32 */ + + ACE_Time_Value tv; + ACE_High_Res_Timer::hrtime_to_tv (tv, + ACE_OS::gethrtime (op)); + return tv; +} + + +// Get the current high res timer as the time of day. This is intended +// to be used for a gettimeofday replacement in ACE_Timer_Queue and +// derived classes so the timers will bebased on high res timers rather +// than wall clock time. It uses the ACE_High_Res_Timer::gettimeofday +// function, which is deprecated. If it gets removed, please move the +// code down here, intact. +ACE_INLINE ACE_Time_Value +ACE_High_Res_Timer::gettimeofday_hr (void) +{ + return ACE_High_Res_Timer::gettimeofday (); +} + + +ACE_INLINE ACE_hrtime_t +ACE_High_Res_Timer::gettime (const ACE_OS::ACE_HRTimer_Op op) +{ +#if defined (ACE_WIN32) + // Get the global scale factor if there isn't one yet. + if (ACE_High_Res_Timer::global_scale_factor_status_ == 0) + ACE_High_Res_Timer::global_scale_factor (); + + // If there isn't a high-res timer, use gettimeofday (); + if (ACE_High_Res_Timer::global_scale_factor_status_ == -1) + { + ACE_Time_Value tv = ACE_OS::gettimeofday (); + // Return the time in microseconds because the global_scale_factor_ + // is 1. + return tv.sec () * ACE_ONE_SECOND_IN_USECS + tv.usec (); + } +#endif /* ACE_WIN32 */ + + return ACE_OS::gethrtime (op); +} + +ACE_INLINE ACE_hrtime_t +ACE_High_Res_Timer::elapsed_hrtime (const ACE_hrtime_t end, + const ACE_hrtime_t start) +{ + if (end > start) + return end - start; + return (~start + 1 + end); // Wrapped-around counter diff +} + +ACE_INLINE +ACE_High_Res_Timer::~ACE_High_Res_Timer (void) +{ +} + +ACE_INLINE void +ACE_High_Res_Timer::start (const ACE_OS::ACE_HRTimer_Op op) +{ + ACE_TRACE ("ACE_High_Res_Timer::start"); + this->start_ = ACE_High_Res_Timer::gettime (op); +} + +ACE_INLINE void +ACE_High_Res_Timer::stop (const ACE_OS::ACE_HRTimer_Op op) +{ + ACE_TRACE ("ACE_High_Res_Timer::stop"); + this->end_ = ACE_High_Res_Timer::gettime (op); +} + +ACE_INLINE void +ACE_High_Res_Timer::start_incr (const ACE_OS::ACE_HRTimer_Op op) +{ + ACE_TRACE ("ACE_High_Res_Timer::start_incr"); + this->start_incr_ = ACE_High_Res_Timer::gettime (op); +} + +ACE_INLINE void +ACE_High_Res_Timer::stop_incr (const ACE_OS::ACE_HRTimer_Op op) +{ + ACE_TRACE ("ACE_High_Res_Timer::stop_incr"); + this->total_ += + ACE_High_Res_Timer::elapsed_hrtime (ACE_High_Res_Timer::gettime (op), + this->start_incr_); +} + +ACE_INLINE void +ACE_High_Res_Timer::elapsed_microseconds (ACE_hrtime_t &usecs) const +{ + ACE_hrtime_t elapsed = ACE_High_Res_Timer::elapsed_hrtime (this->end_, + this->start_); +#if defined (ACE_WIN32) + // Win32 scale factor is in msec + // This could give overflow when measuring a long time with a + // big global_scale_factor() (> 48 days with a 4Ghz tick freq.) + // To be looked after in the future. + usecs = (ACE_hrtime_t) ((elapsed * 1000) / global_scale_factor ()); +#else + usecs = (ACE_hrtime_t) (elapsed / global_scale_factor ()); +#endif +} + +ACE_INLINE void +ACE_High_Res_Timer::global_scale_factor (ACE_UINT32 gsf) +{ + global_scale_factor_ = gsf; +} + +ACE_END_VERSIONED_NAMESPACE_DECL |