Win32 Performance Measurement Options
By Matthew Wilson, May 01, 2003
Win32 provides six main timing functions for profiling. We'll analyze them and present six corresponding performance counter classes that wrap these functions. Also included is a template class that manipulates instances of any of the six timing classes in order to provide scoped timing operations.
Listing 5 Extract from winstl_threadtimes_counter.h
/* /////////////////////////////////////////////////////////////
* ...
*
* Extract from winstl_threadtimes_counter.h
*
* Copyright (C) 2002, Synesis Software Pty Ltd.
* (Licensed under the Synesis Software Standard Source License:
* http://www.synesis.com.au/licenses/ssssl.html)
*
* ...
* ////////////////////////////////////////////////////////// */
inline threadtimes_counter::threadtimes_counter()
: m_thread(::GetCurrentThread())
{
}
// Operations
inline void threadtimes_counter::start()
{
FILETIME creationTime;
FILETIME exitTime;
::GetThreadTimes( m_thread,
&creationTime,
&exitTime,
reinterpret_cast<LPFILETIME>(&m_kernelStart),
reinterpret_cast<LPFILETIME>(&m_userStart));
}
inline void threadtimes_counter::stop()
{
FILETIME creationTime;
FILETIME exitTime;
::GetThreadTimes( m_thread,
&creationTime,
&exitTime,
reinterpret_cast<LPFILETIME>(&m_kernelEnd),
reinterpret_cast<LPFILETIME>(&m_userEnd));
}
// Attributes
// Kernel
inline threadtimes_counter::interval_type threadtimes_counter::get_kernel_period_count() const
{
return static_cast<interval_type>(m_kernelEnd - m_kernelStart);
}
inline threadtimes_counter::interval_type threadtimes_counter::get_kernel_seconds() const
{
return get_kernel_period_count() / interval_type(10000000);
}
inline threadtimes_counter::interval_type threadtimes_counter::get_kernel_milliseconds() const
{
return get_kernel_period_count() / interval_type(10000);
}
inline threadtimes_counter::interval_type threadtimes_counter::get_kernel_microseconds() const
{
return get_kernel_period_count() / interval_type(10);
}
// User
inline threadtimes_counter::interval_type threadtimes_counter::get_user_period_count() const
{
return static_cast<interval_type>(m_userEnd - m_userStart);
}
inline threadtimes_counter::interval_type threadtimes_counter::get_user_seconds() const
{
return get_user_period_count() / interval_type(10000000);
}
inline threadtimes_counter::interval_type threadtimes_counter::get_user_milliseconds() const
{
return get_user_period_count() / interval_type(10000);
}
inline threadtimes_counter::interval_type threadtimes_counter::get_user_microseconds() const
{
return get_user_period_count() / interval_type(10);
}
// Total
inline threadtimes_counter::interval_type threadtimes_counter::get_period_count() const
{
return get_kernel_period_count() + get_user_period_count();
}
inline threadtimes_counter::interval_type threadtimes_counter::get_seconds() const
{
return get_period_count() / interval_type(10000000);
}
inline threadtimes_counter::interval_type threadtimes_counter::get_milliseconds() const
{
return get_period_count() / interval_type(10000);
}
inline threadtimes_counter::interval_type threadtimes_counter::get_microseconds() const
{
return get_period_count() / interval_type(10);
}
