mirror of https://github.com/AxioDL/jbus.git
81 lines
1.9 KiB
C++
81 lines
1.9 KiB
C++
#ifndef _WIN32
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#include <unistd.h>
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#include <sys/time.h>
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#if __APPLE__
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#include <mach/mach_time.h>
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#elif __linux__ || __FreeBSD__
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#include <time.h>
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#endif
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#else
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#ifndef WIN32_LEAN_AND_MEAN
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#define WIN32_LEAN_AND_MEAN
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#endif
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#include <windows.h>
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#include <WinSock2.h>
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#endif
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#include "jbus/Common.hpp"
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namespace jbus {
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#if __APPLE__
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static u64 MachToDolphinNum;
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static u64 MachToDolphinDenom;
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#elif _WIN32
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static LARGE_INTEGER PerfFrequency;
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#endif
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u64 GetGCTicks() {
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#if __APPLE__
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return mach_absolute_time() * MachToDolphinNum / MachToDolphinDenom;
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#elif __linux__ || __FreeBSD__
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struct timespec tp;
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clock_gettime(CLOCK_MONOTONIC, &tp);
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return u64((tp.tv_sec * 1000000000ull) + tp.tv_nsec) * GetGCTicksPerSec() / 1000000000ull;
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#elif _WIN32
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LARGE_INTEGER perf;
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QueryPerformanceCounter(&perf);
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perf.QuadPart *= GetGCTicksPerSec();
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perf.QuadPart /= PerfFrequency.QuadPart;
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return perf.QuadPart;
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#else
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return 0;
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#endif
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}
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void WaitGCTicks(u64 ticks) {
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#ifndef _WIN32
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struct timeval tv = {};
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tv.tv_sec = ticks / GetGCTicksPerSec();
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tv.tv_usec = (ticks % GetGCTicksPerSec()) * 1000000 / GetGCTicksPerSec();
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select(0, NULL, NULL, NULL, &tv);
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#else
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if (ticks < GetGCTicksPerSec() / 60) {
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/* NT is useless for scheduling sub-millisecond intervals */
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u64 start = GetGCTicks();
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do {
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Sleep(0);
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} while (GetGCTicks() - start < ticks);
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} else {
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/* Use normal Sleep() for durations longer than ~16ms */
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Sleep(ticks * 1000 / GetGCTicksPerSec() + (ticks % GetGCTicksPerSec()) * 1000 / GetGCTicksPerSec());
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}
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#endif
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}
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void Initialize() {
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#if __APPLE__
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mach_timebase_info_data_t timebase;
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mach_timebase_info(&timebase);
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MachToDolphinNum = GetGCTicksPerSec() * timebase.numer;
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MachToDolphinDenom = 1000000000ull * timebase.denom;
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#elif _WIN32
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WSADATA initData;
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WSAStartup(MAKEWORD(2, 2), &initData);
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QueryPerformanceFrequency(&PerfFrequency);
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#endif
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}
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} // namespace jbus
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