| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2020 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" |
| #include "SDL_hints.h" |
| #include "../SDL_timer_c.h" |
| |
| #ifdef __EMSCRIPTEN__ |
| #include <emscripten.h> |
| #endif |
| |
| /* 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 = (Uint32)((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) |
| { |
| #ifdef __EMSCRIPTEN__ |
| if (emscripten_has_asyncify() && SDL_GetHintBoolean(SDL_HINT_EMSCRIPTEN_ASYNCIFY, SDL_TRUE)) { |
| /* pseudo-synchronous pause, used directly or through e.g. SDL_WaitEvent */ |
| emscripten_sleep(ms); |
| return; |
| } |
| #endif |
| 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: */ |