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/* sdlx - c++ wrapper for libSDL
* Copyright (C) 2005-2007 Vladimir Menshakov
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "timer.h"
#include "mrt/ioexception.h"
#ifdef _WINDOWS
# include <windows.h>
#elif defined __APPLE__
# include <errno.h>
#else
# include <time.h>
# include <errno.h>
static clockid_t clock_id = CLOCK_REALTIME;
#endif
using namespace sdlx;
Timer::Timer() {
#ifdef _WINDOWS
#ifdef SDLX_TIMER_USES_QPC
tm = new LARGE_INTEGER;
freq = new LARGE_INTEGER;
if (!QueryPerformanceFrequency(freq))
throw_ex(("QueryPerformanceFrequency failed"));
#elif defined __APPLE__
//some stupid initialization
#else
TIMECAPS caps;
if (timeGetDevCaps(&caps, sizeof(caps)) != TIMERR_NOERROR)
throw_ex(("timeGetDevCaps failed"));
res = caps.wPeriodMin;
LOG_DEBUG(("minimum timer's period: %d", res));
#endif
#endif
}
Timer::~Timer() {
#ifdef _WINDOWS
#ifdef SDLX_TIMER_USES_QPC
delete tm; delete freq;
#endif
#endif
}
void Timer::reset() {
#ifdef _WINDOWS
# ifdef SDLX_TIMER_USES_QPC
if (!QueryPerformanceCounter(tm))
throw_ex(("QueryPerformanceCounter failed"));
# else
if (timeBeginPeriod(res) != TIMERR_NOERROR)
throw_ex(("timeBeginPeriod(%d) failed", res));
tm = timeGetTime();
if (timeEndPeriod(res) != TIMERR_NOERROR)
throw_ex(("timeEndPeriod(%d) failed", res));
# endif
#elif defined __APPLE__
if (gettimeofday(&tv, NULL) == -1)
throw_io(("gettimeofday"));
#else
if (clock_gettime(clock_id, &tm) != 0)
throw_io(("clock_gettime"));
#endif
}
const int Timer::microdelta() const {
#ifdef _WINDOWS
# ifdef SDLX_TIMER_USES_QPC
LARGE_INTEGER now;
if (!QueryPerformanceCounter(&now))
throw_ex(("QueryPerformanceCounter failed"));
//LOG_DEBUG(("%I64d - %I64d = %I64d, freq: %I64d", now.QuadPart, tm->QuadPart, (now.QuadPart - tm->QuadPart), freq->QuadPart));
return (now.QuadPart - tm->QuadPart) * 1000000 / freq->QuadPart;
# else
if (timeBeginPeriod(res) != TIMERR_NOERROR)
throw_ex(("timeBeginPeriod(%d) failed", res));
int now = timeGetTime();
if (timeEndPeriod(res) != TIMERR_NOERROR)
throw_ex(("timeEndPeriod(%d) failed", res));
return 1000 * (now - tm);
# endif
#elif defined __APPLE__
struct timeval now;
if (gettimeofday(&now, NULL) == -1)
throw_io(("gettimeofday"));
return ((int)now.tv_sec - (int)tv.tv_sec) *1000000 + (int)now.tv_usec - (int)tv.tv_usec;
#else
struct timespec now;
if (clock_gettime(clock_id, &now) != 0)
throw_io(("clock_gettime"));
return ((int)now.tv_sec - (int)tm.tv_sec) *1000000 + ((int)now.tv_nsec - (int)tm.tv_nsec) / 1000;
#endif
}
void Timer::microsleep(const char *why, const int micros) {
#ifdef _WINDOWS
timeBeginPeriod(1);
//LOG_DEBUG(("microsleep('%s', %d)", why, micros));
/*
LARGE_INTEGER t1, t2, freq;
bool done = false;
QueryPerformanceFrequency(&freq);
QueryPerformanceCounter(&t1);
do {
QueryPerformanceCounter(&t2);
int ticks_passed = (int)((__int64)(t2.QuadPart) - (__int64)(t1.QuadPart));
int ticks_left = micros - ticks_passed;
if (t2.QuadPart < t1.QuadPart) // time wrap
done = true;
if (ticks_passed >= micros)
done = true;
if (!done) {
// if > 0.002s left, do Sleep(1), which will actually sleep some
// steady amount, probably 1-2 ms,
// and do so in a nice way (cpu meter drops; laptop battery spared).
// otherwise, do a few Sleep(0)'s, which just give up the timeslice,
// but don't really save cpu or battery, but do pass a tiny
// amount of time.
if (ticks_left > (int)(freq.QuadPart) * 2 / 1000)
Sleep(1);
else
//for (int i=0; i < 10; i++)
Sleep(0); // causes thread to give up its timeslice
}
} while (!done);
*/
Sleep(micros / 1000);
timeEndPeriod(1);
#else
struct timespec ts, rem;
ts.tv_sec = micros / 1000000;
ts.tv_nsec = (micros % 1000000) * 1000;
do {
//LOG_DEBUG(("nanosleep(%s, %u.%u)", why, (unsigned)ts.tv_sec, (unsigned)ts.tv_nsec));
int r = ::nanosleep(&ts, &rem);
if (r == 0)
return;
if (r == -1 && errno != EINTR)
throw_io(("nanosleep(%s, %u.%u, %u.%u)", why, (unsigned)ts.tv_sec, (unsigned)ts.tv_nsec, (unsigned)rem.tv_sec, (unsigned)rem.tv_nsec));
ts = rem;
} while (rem.tv_nsec != 0 || rem.tv_sec != 0);
#endif
}
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