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