57 lines
1.8 KiB
C++
57 lines
1.8 KiB
C++
/**
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******************************************************************************
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* Xenia : Xbox 360 Emulator Research Project *
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******************************************************************************
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* Copyright 2021 Ben Vanik. All rights reserved. *
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* Released under the BSD license - see LICENSE in the root for more details. *
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******************************************************************************
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*/
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#include <sys/time.h>
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#include "xenia/base/assert.h"
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#include "xenia/base/clock.h"
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namespace xe {
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uint64_t Clock::host_tick_frequency_platform() {
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timespec res;
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int error = clock_getres(CLOCK_MONOTONIC_RAW, &res);
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assert_zero(error);
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assert_zero(res.tv_sec); // Sub second resolution is required.
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// Convert nano seconds to hertz. Resolution is 1ns on most systems.
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return 1000000000ull / res.tv_nsec;
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}
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uint64_t Clock::host_tick_count_platform() {
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timespec tp;
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int error = clock_gettime(CLOCK_MONOTONIC_RAW, &tp);
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assert_zero(error);
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return tp.tv_nsec + tp.tv_sec * 1000000000ull;
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}
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uint64_t Clock::QueryHostSystemTime() {
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// https://docs.microsoft.com/en-us/windows/win32/sysinfo/converting-a-time-t-value-to-a-file-time
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constexpr uint64_t seconds_per_day = 3600 * 24;
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// Don't forget the 89 leap days.
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constexpr uint64_t seconds_1601_to_1970 =
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((369 * 365 + 89) * seconds_per_day);
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timeval now;
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int error = gettimeofday(&now, nullptr);
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assert_zero(error);
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// NT systems use 100ns intervals.
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return static_cast<uint64_t>(
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(static_cast<int64_t>(now.tv_sec) + seconds_1601_to_1970) * 10000000ull +
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now.tv_usec * 10);
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}
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uint64_t Clock::QueryHostUptimeMillis() {
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return host_tick_count_platform() * 1000 / host_tick_frequency_platform();
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}
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} // namespace xe
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