156 lines
3.1 KiB
C++
156 lines
3.1 KiB
C++
// File: crn_win32_timer.cpp
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// See Copyright Notice and license at the end of inc/crnlib.h
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#include "crn_core.h"
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#include "crn_timer.h"
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#include <time.h>
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#include "crn_timer.h"
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#if CRNLIB_USE_WIN32_API
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#include "crn_winhdr.h"
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#endif
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namespace crnlib
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{
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unsigned long long timer::g_init_ticks;
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unsigned long long timer::g_freq;
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double timer::g_inv_freq;
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#if defined(CRNLIB_USE_WIN32_API)
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inline void query_counter(timer_ticks *pTicks)
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{
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QueryPerformanceCounter(reinterpret_cast<LARGE_INTEGER*>(pTicks));
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}
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inline void query_counter_frequency(timer_ticks *pTicks)
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{
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QueryPerformanceFrequency(reinterpret_cast<LARGE_INTEGER*>(pTicks));
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}
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#elif defined(__GNUC__)
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#include <sys/timex.h>
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inline void query_counter(timer_ticks *pTicks)
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{
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struct timeval cur_time;
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gettimeofday(&cur_time, NULL);
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*pTicks = static_cast<unsigned long long>(cur_time.tv_sec)*1000000ULL + static_cast<unsigned long long>(cur_time.tv_usec);
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}
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inline void query_counter_frequency(timer_ticks *pTicks)
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{
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*pTicks = 1000000;
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}
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#else
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#error Unimplemented
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#endif
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timer::timer() :
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m_start_time(0),
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m_stop_time(0),
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m_started(false),
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m_stopped(false)
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{
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if (!g_inv_freq)
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init();
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}
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timer::timer(timer_ticks start_ticks)
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{
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if (!g_inv_freq)
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init();
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m_start_time = start_ticks;
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m_started = true;
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m_stopped = false;
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}
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void timer::start(timer_ticks start_ticks)
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{
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m_start_time = start_ticks;
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m_started = true;
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m_stopped = false;
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}
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void timer::start()
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{
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query_counter(&m_start_time);
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m_started = true;
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m_stopped = false;
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}
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void timer::stop()
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{
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CRNLIB_ASSERT(m_started);
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query_counter(&m_stop_time);
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m_stopped = true;
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}
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double timer::get_elapsed_secs() const
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{
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CRNLIB_ASSERT(m_started);
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if (!m_started)
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return 0;
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timer_ticks stop_time = m_stop_time;
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if (!m_stopped)
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query_counter(&stop_time);
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timer_ticks delta = stop_time - m_start_time;
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return delta * g_inv_freq;
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}
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timer_ticks timer::get_elapsed_us() const
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{
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CRNLIB_ASSERT(m_started);
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if (!m_started)
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return 0;
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timer_ticks stop_time = m_stop_time;
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if (!m_stopped)
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query_counter(&stop_time);
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timer_ticks delta = stop_time - m_start_time;
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return (delta * 1000000ULL + (g_freq >> 1U)) / g_freq;
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}
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void timer::init()
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{
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if (!g_inv_freq)
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{
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query_counter_frequency(&g_freq);
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g_inv_freq = 1.0f / g_freq;
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query_counter(&g_init_ticks);
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}
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}
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timer_ticks timer::get_init_ticks()
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{
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if (!g_inv_freq)
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init();
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return g_init_ticks;
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}
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timer_ticks timer::get_ticks()
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{
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if (!g_inv_freq)
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init();
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timer_ticks ticks;
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query_counter(&ticks);
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return ticks - g_init_ticks;
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}
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double timer::ticks_to_secs(timer_ticks ticks)
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{
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if (!g_inv_freq)
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init();
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return ticks * g_inv_freq;
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}
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} // namespace crnlib
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