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