You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
107 lines
3.5 KiB
107 lines
3.5 KiB
4 years ago
|
// 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
|