Line data    Source code

       1             : #ifdef __PLUMED_HAS_ASMJIT
       2             : // This file is part of AsmJit project <https://asmjit.com>
       3             : //
       4             : // See asmjit.h or LICENSE.md for license and copyright information
       5             : // SPDX-License-Identifier: Zlib
       6             : 
       7             : #include "api-build_p.h"
       8             : #include "osutils.h"
       9             : #include "support.h"
      10             : 
      11             : #if defined(_WIN32)
      12             :   #include <atomic>
      13             : #elif defined(__APPLE__)
      14             :   #include <mach/mach_time.h>
      15             : #else
      16             :   #include <time.h>
      17             :   #include <unistd.h>
      18             : #endif
      19             : 
      20             : ASMJIT_BEGIN_NAMESPACE
      21             : 
      22           0 : uint32_t OSUtils::getTickCount() noexcept {
      23             : #if defined(_WIN32)
      24             :   enum HiResStatus : uint32_t {
      25             :     kHiResUnknown      = 0,
      26             :     kHiResAvailable    = 1,
      27             :     kHiResNotAvailable = 2
      28             :   };
      29             : 
      30             :   static std::atomic<uint32_t> _hiResStatus(kHiResUnknown);
      31             :   static volatile double _hiResFreq(0);
      32             : 
      33             :   uint32_t status = _hiResStatus.load();
      34             :   LARGE_INTEGER now, qpf;
      35             : 
      36             :   if (status != kHiResNotAvailable && ::QueryPerformanceCounter(&now)) {
      37             :     double freq = _hiResFreq;
      38             :     if (status == kHiResUnknown) {
      39             :       // Detects the availability of high resolution counter.
      40             :       if (::QueryPerformanceFrequency(&qpf)) {
      41             :         freq = double(qpf.QuadPart) / 1000.0;
      42             :         _hiResFreq = freq;
      43             :         _hiResStatus.compare_exchange_strong(status, kHiResAvailable);
      44             :         status = kHiResAvailable;
      45             :       }
      46             :       else {
      47             :         // High resolution not available.
      48             :         _hiResStatus.compare_exchange_strong(status, kHiResNotAvailable);
      49             :       }
      50             :     }
      51             : 
      52             :     if (status == kHiResAvailable)
      53             :       return uint32_t(uint64_t(int64_t(double(now.QuadPart) / freq)) & 0xFFFFFFFFu);
      54             :   }
      55             : 
      56             :   // Bail to `GetTickCount()` if we cannot use high resolution.
      57             :   return ::GetTickCount();
      58             : #elif defined(__APPLE__)
      59             :   // See Apple's QA1398.
      60             :   static mach_timebase_info_data_t _machTime;
      61             : 
      62             :   uint32_t denom = _machTime.denom;
      63             :   if (ASMJIT_UNLIKELY(!denom)) {
      64             :     if (mach_timebase_info(&_machTime) != KERN_SUCCESS || !(denom = _machTime.denom))
      65             :       return 0;
      66             :   }
      67             : 
      68             :   // `mach_absolute_time()` returns nanoseconds, we want milliseconds.
      69             :   uint64_t t = mach_absolute_time() / 1000000u;
      70             :   t = (t * _machTime.numer) / _machTime.denom;
      71             :   return uint32_t(t & 0xFFFFFFFFu);
      72             : #elif defined(_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
      73             :   struct timespec ts;
      74           0 :   if (ASMJIT_UNLIKELY(clock_gettime(CLOCK_MONOTONIC, &ts) != 0))
      75             :     return 0;
      76             : 
      77           0 :   uint64_t t = (uint64_t(ts.tv_sec ) * 1000u) + (uint64_t(ts.tv_nsec) / 1000000u);
      78           0 :   return uint32_t(t & 0xFFFFFFFFu);
      79             : #else
      80             :   #pragma message("asmjit::OSUtils::getTickCount() doesn't have implementation for the target OS.")
      81             :   return 0;
      82             : #endif
      83             : }
      84             : 
      85             : ASMJIT_END_NAMESPACE
      86             : 
      87             : #endif // __PLUMED_HAS_ASMJIT