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Diffstat (limited to 'client/asmjit/core/osutils.cpp')
| -rw-r--r-- | client/asmjit/core/osutils.cpp | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/client/asmjit/core/osutils.cpp b/client/asmjit/core/osutils.cpp new file mode 100644 index 0000000..e2f34ef --- /dev/null +++ b/client/asmjit/core/osutils.cpp @@ -0,0 +1,106 @@ +// AsmJit - Machine code generation for C++ +// +// * Official AsmJit Home Page: https://asmjit.com +// * Official Github Repository: https://github.com/asmjit/asmjit +// +// Copyright (c) 2008-2020 The AsmJit Authors +// +// This software is provided 'as-is', without any express or implied +// warranty. In no event will the authors be held liable for any damages +// arising from the use of this software. +// +// Permission is granted to anyone to use this software for any purpose, +// including commercial applications, and to alter it and redistribute it +// freely, subject to the following restrictions: +// +// 1. The origin of this software must not be misrepresented; you must not +// claim that you wrote the original software. If you use this software +// in a product, an acknowledgment in the product documentation would be +// appreciated but is not required. +// 2. Altered source versions must be plainly marked as such, and must not be +// misrepresented as being the original software. +// 3. This notice may not be removed or altered from any source distribution. + +#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 + +// ============================================================================ +// [asmjit::OSUtils - GetTickCount] +// ============================================================================ + +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 |