85 lines
2.4 KiB
C++
85 lines
2.4 KiB
C++
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// This file is part of AsmJit project <https://asmjit.com>
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//
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// See asmjit.h or LICENSE.md for license and copyright information
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// SPDX-License-Identifier: Zlib
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#include "../core/api-build_p.h"
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#include "../core/osutils.h"
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#include "../core/support.h"
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#if defined(_WIN32)
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#include <atomic>
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#elif defined(__APPLE__)
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#include <mach/mach_time.h>
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#else
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#include <time.h>
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#include <unistd.h>
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#endif
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ASMJIT_BEGIN_NAMESPACE
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uint32_t OSUtils::getTickCount() noexcept {
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#if defined(_WIN32)
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enum HiResStatus : uint32_t {
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kHiResUnknown = 0,
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kHiResAvailable = 1,
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kHiResNotAvailable = 2
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};
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static std::atomic<uint32_t> _hiResStatus(kHiResUnknown);
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static volatile double _hiResFreq(0);
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uint32_t status = _hiResStatus.load();
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LARGE_INTEGER now, qpf;
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if (status != kHiResNotAvailable && ::QueryPerformanceCounter(&now)) {
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double freq = _hiResFreq;
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if (status == kHiResUnknown) {
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// Detects the availability of high resolution counter.
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if (::QueryPerformanceFrequency(&qpf)) {
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freq = double(qpf.QuadPart) / 1000.0;
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_hiResFreq = freq;
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_hiResStatus.compare_exchange_strong(status, kHiResAvailable);
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status = kHiResAvailable;
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}
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else {
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// High resolution not available.
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_hiResStatus.compare_exchange_strong(status, kHiResNotAvailable);
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}
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}
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if (status == kHiResAvailable)
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return uint32_t(uint64_t(int64_t(double(now.QuadPart) / freq)) & 0xFFFFFFFFu);
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}
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// Bail to `GetTickCount()` if we cannot use high resolution.
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return ::GetTickCount();
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#elif defined(__APPLE__)
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// See Apple's QA1398.
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static mach_timebase_info_data_t _machTime;
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uint32_t denom = _machTime.denom;
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if (ASMJIT_UNLIKELY(!denom)) {
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if (mach_timebase_info(&_machTime) != KERN_SUCCESS || !(denom = _machTime.denom))
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return 0;
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}
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// `mach_absolute_time()` returns nanoseconds, we want milliseconds.
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uint64_t t = mach_absolute_time() / 1000000u;
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t = (t * _machTime.numer) / _machTime.denom;
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return uint32_t(t & 0xFFFFFFFFu);
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#elif defined(_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
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struct timespec ts;
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if (ASMJIT_UNLIKELY(clock_gettime(CLOCK_MONOTONIC, &ts) != 0))
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return 0;
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uint64_t t = (uint64_t(ts.tv_sec ) * 1000u) + (uint64_t(ts.tv_nsec) / 1000000u);
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return uint32_t(t & 0xFFFFFFFFu);
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#else
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#pragma message("asmjit::OSUtils::getTickCount() doesn't have implementation for the target OS.")
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return 0;
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#endif
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}
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ASMJIT_END_NAMESPACE
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