SDL_systimer.c
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/*
Simple DirectMedia Layer
Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
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_internal.h"
#ifdef SDL_TIMER_UNIX
#include <stdio.h>
#include <sys/time.h>
#include <unistd.h>
#include <errno.h>
#include "SDL_timer.h"
#include "SDL_assert.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
*/
/* 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
*/
#if HAVE_NANOSLEEP || HAVE_CLOCK_GETTIME
#include <time.h>
#endif
#ifdef __APPLE__
#include <mach/mach_time.h>
#endif
/* Use CLOCK_MONOTONIC_RAW, if available, which is not subject to adjustment by NTP */
#if HAVE_CLOCK_GETTIME
#ifdef CLOCK_MONOTONIC_RAW
#define SDL_MONOTONIC_CLOCK CLOCK_MONOTONIC_RAW
#else
#define SDL_MONOTONIC_CLOCK CLOCK_MONOTONIC
#endif
#endif
/* The first ticks value of the application */
#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;
static SDL_bool ticks_started = SDL_FALSE;
void
SDL_TicksInit(void)
{
if (ticks_started) {
return;
}
ticks_started = SDL_TRUE;
/* Set first ticks value */
#if HAVE_CLOCK_GETTIME
if (clock_gettime(SDL_MONOTONIC_CLOCK, &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;
start_mach = mach_absolute_time();
} else
#endif
{
gettimeofday(&start_tv, NULL);
}
}
void
SDL_TicksQuit(void)
{
ticks_started = SDL_FALSE;
}
Uint32
SDL_GetTicks(void)
{
Uint32 ticks;
if (!ticks_started) {
SDL_TicksInit();
}
if (has_monotonic_time) {
#if HAVE_CLOCK_GETTIME
struct timespec now;
clock_gettime(SDL_MONOTONIC_CLOCK, &now);
ticks = (now.tv_sec - start_ts.tv_sec) * 1000 + (now.tv_nsec -
start_ts.tv_nsec) / 1000000;
#elif defined(__APPLE__)
uint64_t now = mach_absolute_time();
ticks = (Uint32)((((now - start_mach) * mach_base_info.numer) / mach_base_info.denom) / 1000000);
#else
SDL_assert(SDL_FALSE);
ticks = 0;
#endif
} else {
struct timeval now;
gettimeofday(&now, NULL);
ticks = (Uint32)((now.tv_sec - start_tv.tv_sec) * 1000 + (now.tv_usec - start_tv.tv_usec) / 1000);
}
return (ticks);
}
Uint64
SDL_GetPerformanceCounter(void)
{
Uint64 ticks;
if (!ticks_started) {
SDL_TicksInit();
}
if (has_monotonic_time) {
#if HAVE_CLOCK_GETTIME
struct timespec now;
clock_gettime(SDL_MONOTONIC_CLOCK, &now);
ticks = now.tv_sec;
ticks *= 1000000000;
ticks += now.tv_nsec;
#elif defined(__APPLE__)
ticks = mach_absolute_time();
#else
SDL_assert(SDL_FALSE);
ticks = 0;
#endif
} else {
struct timeval now;
gettimeofday(&now, NULL);
ticks = now.tv_sec;
ticks *= 1000000;
ticks += now.tv_usec;
}
return (ticks);
}
Uint64
SDL_GetPerformanceFrequency(void)
{
if (!ticks_started) {
SDL_TicksInit();
}
if (has_monotonic_time) {
#if HAVE_CLOCK_GETTIME
return 1000000000;
#elif defined(__APPLE__)
Uint64 freq = mach_base_info.denom;
freq *= 1000000000;
freq /= mach_base_info.numer;
return freq;
#endif
}
return 1000000;
}
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: */
Uint32
uint32_t Uint32
An unsigned 32-bit integer type.
Definition: SDL_stdinc.h:157
ticks
static int ticks
Definition: testtimer.c:24
uint64_t
unsigned long long uint64_t
Definition: SDL_config_windows.h:64
SDL_GetPerformanceFrequency
Uint64 SDL_GetPerformanceFrequency(void)
Get the count per second of the high resolution counter.
Uint64
uint64_t Uint64
An unsigned 64-bit integer type.
Definition: SDL_stdinc.h:166
SDL_TicksQuit
void SDL_TicksQuit(void)
SDL_bool
SDL_bool
Definition: SDL_stdinc.h:126
SDL_GetTicks
Uint32 SDL_GetTicks(void)
Get the number of milliseconds since the SDL library initialization.
SDL_TRUE
Definition: SDL_stdinc.h:129
SDL_GetPerformanceCounter
#define SDL_GetPerformanceCounter
Definition: SDL_dynapi_overrides.h:488
SDL_Delay
#define SDL_Delay
Definition: SDL_dynapi_overrides.h:490
SDL_assert
#define SDL_assert(condition)
Definition: SDL_assert.h:167
NULL
#define NULL
Definition: begin_code.h:143
SDL_FALSE
Definition: SDL_stdinc.h:128
SDL_TicksInit
void SDL_TicksInit(void)
SDL_timer.h
SDL_assert.h