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authorDimitry Andric <dim@FreeBSD.org>2017-01-02 19:18:58 +0000
committerDimitry Andric <dim@FreeBSD.org>2017-01-02 19:18:58 +0000
commit53a420fba21cf1644972b34dcd811a43cdb8368d (patch)
tree66a19f6f8b65215772549a51d688492ab8addc0d /src/chrono.cpp
parentb50f1549701eb950921e5d6f2e55ba1a1dadbb43 (diff)
downloadsrc-53a420fba21cf1644972b34dcd811a43cdb8368d.tar.gz
src-53a420fba21cf1644972b34dcd811a43cdb8368d.zip
Vendor import of libc++ trunk r290819:vendor/libc++/libc++-trunk-r290819
Notes
Notes: svn path=/vendor/libc++/dist/; revision=311123 svn path=/vendor/libc++/libc++-trunk-r290819/; revision=311124; tag=vendor/libc++/libc++-trunk-r290819
Diffstat (limited to 'src/chrono.cpp')
-rw-r--r--src/chrono.cpp83
1 files changed, 65 insertions, 18 deletions
diff --git a/src/chrono.cpp b/src/chrono.cpp
index 62149fbf420c..b9d6bf97be33 100644
--- a/src/chrono.cpp
+++ b/src/chrono.cpp
@@ -12,14 +12,23 @@
#include "system_error" // __throw_system_error
#include <time.h> // clock_gettime, CLOCK_MONOTONIC and CLOCK_REALTIME
+#if defined(_WIN32)
+#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
+#endif
-#if !defined(_LIBCPP_HAS_NO_MONOTONIC_CLOCK) && !defined(CLOCK_MONOTONIC)
+#if !defined(_LIBCPP_HAS_NO_MONOTONIC_CLOCK)
#if __APPLE__
#include <mach/mach_time.h> // mach_absolute_time, mach_timebase_info_data_t
-#else
+#elif !defined(_WIN32) && !defined(CLOCK_MONOTONIC)
#error "Monotonic clock not implemented"
#endif
#endif
@@ -36,6 +45,32 @@ const bool system_clock::is_steady;
system_clock::time_point
system_clock::now() _NOEXCEPT
{
+#if defined(_WIN32)
+ // 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 filetime_duration
+ 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
#ifdef CLOCK_REALTIME
struct timespec tp;
if (0 != clock_gettime(CLOCK_REALTIME, &tp))
@@ -46,6 +81,7 @@ system_clock::now() _NOEXCEPT
gettimeofday(&tv, 0);
return time_point(seconds(tv.tv_sec) + microseconds(tv.tv_usec));
#endif // CLOCK_REALTIME
+#endif
}
time_t
@@ -69,18 +105,7 @@ system_clock::from_time_t(time_t t) _NOEXCEPT
const bool steady_clock::is_steady;
-#ifdef 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));
-}
-
-#elif defined(__APPLE__)
+#if defined(__APPLE__)
// mach_absolute_time() * MachInfo.numer / MachInfo.denom is the number of
// nanoseconds since the computer booted up. MachInfo.numer and MachInfo.denom
@@ -90,8 +115,6 @@ steady_clock::now() _NOEXCEPT
// MachInfo.numer / MachInfo.denom is often 1 on the latest equipment. Specialize
// for that case as an optimization.
-#pragma GCC visibility push(hidden)
-
static
steady_clock::rep
steady_simplified()
@@ -129,8 +152,6 @@ init_steady_clock()
return &steady_full;
}
-#pragma GCC visibility pop
-
steady_clock::time_point
steady_clock::now() _NOEXCEPT
{
@@ -138,6 +159,32 @@ steady_clock::now() _NOEXCEPT
return time_point(duration(fp()));
}
+#elif defined(_WIN32)
+
+steady_clock::time_point
+steady_clock::now() _NOEXCEPT
+{
+ static LARGE_INTEGER freq;
+ static BOOL initialized = FALSE;
+ if (!initialized)
+ initialized = QueryPerformanceFrequency(&freq); // always succceeds
+
+ LARGE_INTEGER counter;
+ 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