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SDL_systimer.c
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/*
Simple DirectMedia Layer
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Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "SDL_config.h"
#ifdef SDL_TIMER_UNIX
#include <stdio.h>
#include <sys/time.h>
#include <unistd.h>
#include <errno.h>
#include "SDL_timer.h"
/* The clock_gettime provides monotonous time, so we should use it if
it's available. The clock_gettime function is behind ifdef
for __USE_POSIX199309
Tommi Kyntola (tommi.kyntola@ray.fi) 27/09/2005
*/
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/* Reworked monotonic clock to not assume the current system has one
as not all linux kernels provide a monotonic clock (yeah recent ones
probably do)
Also added OS X Monotonic clock support
Based on work in https://github.com/ThomasHabets/monotonic_clock
*/
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#if HAVE_NANOSLEEP || HAVE_CLOCK_GETTIME
#include <time.h>
#endif
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#ifdef __APPLE__
#include <mach/mach_time.h>
#endif
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/* The first ticks value of the application */
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#if HAVE_CLOCK_GETTIME
static struct timespec start_ts;
#elif defined(__APPLE__)
static uint64_t start_mach;
mach_timebase_info_data_t mach_base_info;
#endif
static SDL_bool has_monotonic_time = SDL_FALSE;
static struct timeval start_tv;
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void
SDL_StartTicks(void)
{
/* Set first ticks value */
#if HAVE_CLOCK_GETTIME
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if (clock_gettime(CLOCK_MONOTONIC, &start_ts) == 0) {
has_monotonic_time = SDL_TRUE;
} else
#elif defined(__APPLE__)
kern_return_t ret = mach_timebase_info(&mach_base_info);
if (ret == 0) {
has_monotonic_time = SDL_TRUE;
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start_mach = mach_absolute_time();
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{
gettimeofday(&start_tv, NULL);
}
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}
Uint32
SDL_GetTicks(void)
{
Uint32 ticks;
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if (has_monotonic_time) {
#if HAVE_CLOCK_GETTIME
struct timespec now;
clock_gettime(CLOCK_MONOTONIC, &now);
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ticks = (now.tv_sec - start_ts.tv_sec) * 1000 + (now.tv_nsec -
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start_ts.tv_nsec) / 1000000;
#elif defined(__APPLE__)
uint64_t now = mach_absolute_time();
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ticks = (((now - start_mach) * mach_base_info.numer) / mach_base_info.denom) / 1000000;
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} else {
struct timeval now;
gettimeofday(&now, NULL);
ticks =
(now.tv_sec - start_tv.tv_sec) * 1000 + (now.tv_usec -
start_tv.tv_usec) / 1000;
}
return (ticks);
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}
Uint64
SDL_GetPerformanceCounter(void)
{
Uint64 ticks;
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if (has_monotonic_time) {
#if HAVE_CLOCK_GETTIME
struct timespec now;
clock_gettime(CLOCK_MONOTONIC, &now);
ticks = now.tv_sec;
ticks *= 1000000000;
ticks += now.tv_nsec;
#elif defined(__APPLE__)
ticks = mach_absolute_time();
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} else {
struct timeval now;
gettimeofday(&now, NULL);
ticks = now.tv_sec;
ticks *= 1000000;
ticks += now.tv_usec;
}
return (ticks);
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}
Uint64
SDL_GetPerformanceFrequency(void)
{
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if (has_monotonic_time) {
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#if HAVE_CLOCK_GETTIME
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return 1000000000;
#elif defined(__APPLE__)
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Uint64 freq = mach_base_info.numer;
freq *= 1000000000;
freq /= mach_base_info.denom;
return freq;
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} else {
return 1000000;
}
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}
void
SDL_Delay(Uint32 ms)
{
int was_error;
#if HAVE_NANOSLEEP
struct timespec elapsed, tv;
#else
struct timeval tv;
Uint32 then, now, elapsed;
#endif
/* Set the timeout interval */
#if HAVE_NANOSLEEP
elapsed.tv_sec = ms / 1000;
elapsed.tv_nsec = (ms % 1000) * 1000000;
#else
then = SDL_GetTicks();
#endif
do {
errno = 0;
#if HAVE_NANOSLEEP
tv.tv_sec = elapsed.tv_sec;
tv.tv_nsec = elapsed.tv_nsec;
was_error = nanosleep(&tv, &elapsed);
#else
/* Calculate the time interval left (in case of interrupt) */
now = SDL_GetTicks();
elapsed = (now - then);
then = now;
if (elapsed >= ms) {
break;
}
ms -= elapsed;
tv.tv_sec = ms / 1000;
tv.tv_usec = (ms % 1000) * 1000;
was_error = select(0, NULL, NULL, NULL, &tv);
#endif /* HAVE_NANOSLEEP */
} while (was_error && (errno == EINTR));
}
#endif /* SDL_TIMER_UNIX */
/* vi: set ts=4 sw=4 expandtab: */