mirror of
https://github.com/gnif/LookingGlass.git
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133 lines
3.3 KiB
C
133 lines
3.3 KiB
C
/**
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* Looking Glass
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* Copyright © 2017-2021 The Looking Glass Authors
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* https://looking-glass.io
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc., 59
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* Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#pragma once
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#include <stdint.h>
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#include <stdbool.h>
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#include <time.h>
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#if defined(_WIN32)
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#include <windows.h>
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void windowsSetTimerResolution(void);
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NTSYSCALLAPI NTSTATUS NTAPI NtDelayExecution(
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_In_ BOOLEAN Alertable,
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_In_opt_ PLARGE_INTEGER DelayInterval
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);
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#endif
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typedef struct LGTimer LGTimer;
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static inline uint64_t microtime(void)
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{
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#if defined(_WIN32)
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static LARGE_INTEGER freq = { 0 };
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if (!freq.QuadPart)
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QueryPerformanceFrequency(&freq);
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LARGE_INTEGER time;
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QueryPerformanceCounter(&time);
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return time.QuadPart / (freq.QuadPart / 1000000LL);
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#else
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struct timespec time;
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clock_gettime(CLOCK_MONOTONIC, &time);
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return (uint64_t)time.tv_sec * 1000000LL + time.tv_nsec / 1000LL;
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#endif
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}
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static inline void nsleep(uint64_t ns)
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{
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#if defined(_WIN32)
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LARGE_INTEGER interval = { .QuadPart = -(int64_t)(ns / 100LL) };
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NtDelayExecution(FALSE, &interval);
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#else
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const struct timespec ts =
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{
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.tv_sec = ns / 1e9,
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.tv_nsec = ns - ((ns / 1e9) * 1e9)
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};
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nanosleep(&ts, NULL);
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#endif
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}
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static inline uint64_t nanotime(void)
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{
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#if defined(_WIN32)
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static double multiplier = 0.0;
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if (!multiplier)
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{
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LARGE_INTEGER freq = { 0 };
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QueryPerformanceFrequency(&freq);
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multiplier = 1e9 / freq.QuadPart;
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}
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LARGE_INTEGER time;
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QueryPerformanceCounter(&time);
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return (uint64_t) (time.QuadPart * multiplier);
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#else
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struct timespec time;
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clock_gettime(CLOCK_MONOTONIC_RAW, &time);
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return ((uint64_t)time.tv_sec * 1000000000LL) + time.tv_nsec;
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#endif
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}
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static inline void tsDiff(struct timespec *diff, const struct timespec *left,
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const struct timespec *right)
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{
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diff->tv_sec = left->tv_sec - right->tv_sec;
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diff->tv_nsec = left->tv_nsec - right->tv_nsec;
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if (diff->tv_nsec < 0)
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{
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--diff->tv_sec;
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diff->tv_nsec += 1000000000;
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}
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}
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static inline uint32_t __iter_div_u64_rem(uint64_t dividend, uint32_t divisor, uint64_t *remainder)
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{
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uint32_t ret = 0;
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while (dividend >= divisor) {
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/* The following asm() prevents the compiler from
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optimising this loop into a modulo operation. */
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asm("" : "+rm"(dividend));
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dividend -= divisor;
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ret++;
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}
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*remainder = dividend;
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return ret;
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}
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static inline void tsAdd(struct timespec *a, uint64_t ns)
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{
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a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, 1000000000L, &ns);
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a->tv_nsec = ns;
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}
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typedef bool (*LGTimerFn)(void * udata);
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bool lgCreateTimer(const unsigned int intervalMS, LGTimerFn fn,
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void * udata, LGTimer ** result);
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void lgTimerDestroy(LGTimer * timer);
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