File Manager

003 File Manager

Current Path: /usr/src/contrib/llvm-project/libcxx/src

usr / src / contrib / llvm-project / libcxx / src /

📁 ..
📄 algorithm.cpp(3.73 KB)
📄 any.cpp(933 B)
📄 atomic.cpp(7.67 KB)
📄 barrier.cpp(3.77 KB)
📄 bind.cpp(715 B)
📄 charconv.cpp(4.51 KB)
📄 chrono.cpp(4.94 KB)
📄 condition_variable.cpp(2.73 KB)
📄 condition_variable_destructor.cpp(1.26 KB)
📄 debug.cpp(13.37 KB)
📄 exception.cpp(1.25 KB)
📁 experimental
📁 filesystem
📄 functional.cpp(656 B)
📄 future.cpp(6.21 KB)
📄 hash.cpp(13.04 KB)
📁 include
📄 ios.cpp(12.62 KB)
📄 iostream.cpp(5.66 KB)
📄 locale.cpp(189.52 KB)
📄 memory.cpp(6.15 KB)
📄 mutex.cpp(5.77 KB)
📄 mutex_destructor.cpp(1.44 KB)
📄 new.cpp(5.98 KB)
📄 optional.cpp(1.16 KB)
📄 random.cpp(3.98 KB)
📄 random_shuffle.cpp(1.26 KB)
📄 regex.cpp(8.22 KB)
📄 shared_mutex.cpp(2.86 KB)
📄 stdexcept.cpp(592 B)
📄 string.cpp(11.54 KB)
📄 strstream.cpp(8.46 KB)
📁 support
📄 system_error.cpp(6.88 KB)
📄 thread.cpp(5.42 KB)
📄 typeinfo.cpp(1.79 KB)
📄 utility.cpp(497 B)
📄 valarray.cpp(1.67 KB)
📄 variant.cpp(517 B)
📄 vector.cpp(529 B)

Editing: chrono.cpp

//===------------------------- chrono.cpp ---------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "chrono"
#include "cerrno"        // errno
#include "system_error"  // __throw_system_error
#include <time.h>        // clock_gettime and CLOCK_{MONOTONIC,REALTIME,MONOTONIC_RAW}
#include "include/apple_availability.h"

#if __has_include(<unistd.h>)
#include <unistd.h>
#endif

#if !defined(__APPLE__) && _POSIX_TIMERS > 0
#define _LIBCPP_USE_CLOCK_GETTIME
#endif

#if defined(_LIBCPP_WIN32API)
#  define WIN32_LEAN_AND_MEAN
#  define VC_EXTRA_LEAN
#  include <windows.h>
#  if _WIN32_WINNT >= _WIN32_WINNT_WIN8
#    include <winapifamily.h>
#  endif
#else
#  if !defined(CLOCK_REALTIME)
#    include <sys/time.h>        // for gettimeofday and timeval
#  endif // !defined(CLOCK_REALTIME)
#endif // defined(_LIBCPP_WIN32API)

#if defined(__ELF__) && defined(_LIBCPP_LINK_RT_LIB)
#  pragma comment(lib, "rt")
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

namespace chrono
{

// system_clock

const bool system_clock::is_steady;

system_clock::time_point
system_clock::now() _NOEXCEPT
{
#if defined(_LIBCPP_WIN32API)
  // FILETIME is in 100ns units
  using filetime_duration =
      _VSTD::chrono::duration<__int64,
                              _VSTD::ratio_multiply<_VSTD::ratio<100, 1>,
                                                    nanoseconds::period>>;

// The Windows epoch is Jan 1 1601, the Unix epoch Jan 1 1970.
  static _LIBCPP_CONSTEXPR const seconds nt_to_unix_epoch{11644473600};

FILETIME ft;
#if _WIN32_WINNT >= _WIN32_WINNT_WIN8
#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
  GetSystemTimePreciseAsFileTime(&ft);
#else
  GetSystemTimeAsFileTime(&ft);
#endif
#else
  GetSystemTimeAsFileTime(&ft);
#endif

filetime_duration d{(static_cast<__int64>(ft.dwHighDateTime) << 32) |
                       static_cast<__int64>(ft.dwLowDateTime)};
  return time_point(duration_cast<duration>(d - nt_to_unix_epoch));
#else
#if defined(CLOCK_REALTIME)
  struct timespec tp;
  if (0 != clock_gettime(CLOCK_REALTIME, &tp))
    __throw_system_error(errno, "clock_gettime(CLOCK_REALTIME) failed");
  return time_point(seconds(tp.tv_sec) + microseconds(tp.tv_nsec / 1000));
#else
    timeval tv;
    gettimeofday(&tv, 0);
    return time_point(seconds(tv.tv_sec) + microseconds(tv.tv_usec));
#endif // CLOCK_REALTIME
#endif
}

time_t
system_clock::to_time_t(const time_point& t) _NOEXCEPT
{
    return time_t(duration_cast<seconds>(t.time_since_epoch()).count());
}

system_clock::time_point
system_clock::from_time_t(time_t t) _NOEXCEPT
{
    return system_clock::time_point(seconds(t));
}

#ifndef _LIBCPP_HAS_NO_MONOTONIC_CLOCK
// steady_clock
//
// Warning:  If this is not truly steady, then it is non-conforming.  It is
//  better for it to not exist and have the rest of libc++ use system_clock
//  instead.

const bool steady_clock::is_steady;

#if defined(__APPLE__)

#if !defined(CLOCK_MONOTONIC_RAW)
#  error "Building libc++ on Apple platforms requires CLOCK_MONOTONIC_RAW"
#endif

// On Apple platforms, only CLOCK_UPTIME_RAW, CLOCK_MONOTONIC_RAW or
// mach_absolute_time are able to time functions in the nanosecond range.
// Furthermore, only CLOCK_MONOTONIC_RAW is truly monotonic, because it
// also counts cycles when the system is asleep. Thus, it is the only
// acceptable implementation of steady_clock.
steady_clock::time_point
steady_clock::now() _NOEXCEPT
{
    struct timespec tp;
    if (0 != clock_gettime(CLOCK_MONOTONIC_RAW, &tp))
        __throw_system_error(errno, "clock_gettime(CLOCK_MONOTONIC_RAW) failed");
    return time_point(seconds(tp.tv_sec) + nanoseconds(tp.tv_nsec));
}

#elif defined(_LIBCPP_WIN32API)

// https://msdn.microsoft.com/en-us/library/windows/desktop/ms644905(v=vs.85).aspx says:
//    If the function fails, the return value is zero. <snip>
//    On systems that run Windows XP or later, the function will always succeed
//      and will thus never return zero.

static LARGE_INTEGER
__QueryPerformanceFrequency()
{
	LARGE_INTEGER val;
	(void) QueryPerformanceFrequency(&val);
	return val;
}

steady_clock::time_point
steady_clock::now() _NOEXCEPT
{
  static const LARGE_INTEGER freq = __QueryPerformanceFrequency();

LARGE_INTEGER counter;
  (void) QueryPerformanceCounter(&counter);
  return time_point(duration(counter.QuadPart * nano::den / freq.QuadPart));
}

#elif defined(CLOCK_MONOTONIC)

steady_clock::time_point
steady_clock::now() _NOEXCEPT
{
    struct timespec tp;
    if (0 != clock_gettime(CLOCK_MONOTONIC, &tp))
        __throw_system_error(errno, "clock_gettime(CLOCK_MONOTONIC) failed");
    return time_point(seconds(tp.tv_sec) + nanoseconds(tp.tv_nsec));
}

#else
#  error "Monotonic clock not implemented"
#endif

#endif // !_LIBCPP_HAS_NO_MONOTONIC_CLOCK

}

_LIBCPP_END_NAMESPACE_STD

003 File Manager

Editing: chrono.cpp

Upload File

Create Folder