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authorDimitry Andric <dim@FreeBSD.org>2015-09-06 18:46:46 +0000
committerDimitry Andric <dim@FreeBSD.org>2015-09-06 18:46:46 +0000
commit61b9a7258a7693d7f3674a5a1daf7b036ff1d382 (patch)
treeec41ed70ffca97240e76f9a78bb2dedba28f310c /src/chrono.cpp
parentf857581820d15e410e9945d2fcd5f7163be25a96 (diff)
downloadsrc-61b9a7258a7693d7f3674a5a1daf7b036ff1d382.tar.gz
src-61b9a7258a7693d7f3674a5a1daf7b036ff1d382.zip
Import libc++ 3.7.0 release (r246257).vendor/libc++/libc++-release_370-r246257
Notes
Notes: svn path=/vendor/libc++/dist/; revision=287518 svn path=/vendor/libc++/libc++-release_370-r246257/; revision=287519; tag=vendor/libc++/libc++-release_370-r246257
Diffstat (limited to 'src/chrono.cpp')
-rw-r--r--src/chrono.cpp66
1 files changed, 41 insertions, 25 deletions
diff --git a/src/chrono.cpp b/src/chrono.cpp
index 456941144e01..62149fbf420c 100644
--- a/src/chrono.cpp
+++ b/src/chrono.cpp
@@ -8,14 +8,21 @@
//===----------------------------------------------------------------------===//
#include "chrono"
-#include <sys/time.h> //for gettimeofday and timeval
-#ifdef __APPLE__
+#include "cerrno" // errno
+#include "system_error" // __throw_system_error
+#include <time.h> // clock_gettime, CLOCK_MONOTONIC and CLOCK_REALTIME
+
+#if !defined(CLOCK_REALTIME)
+#include <sys/time.h> // for gettimeofday and timeval
+#endif
+
+#if !defined(_LIBCPP_HAS_NO_MONOTONIC_CLOCK) && !defined(CLOCK_MONOTONIC)
+#if __APPLE__
#include <mach/mach_time.h> // mach_absolute_time, mach_timebase_info_data_t
-#else /* !__APPLE__ */
-#include <cerrno> // errno
-#include <system_error> // __throw_system_error
-#include <time.h> // clock_gettime, CLOCK_MONOTONIC
-#endif // __APPLE__
+#else
+#error "Monotonic clock not implemented"
+#endif
+#endif
_LIBCPP_BEGIN_NAMESPACE_STD
@@ -29,9 +36,16 @@ const bool system_clock::is_steady;
system_clock::time_point
system_clock::now() _NOEXCEPT
{
+#ifdef 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 // !CLOCK_REALTIME
timeval tv;
gettimeofday(&tv, 0);
return time_point(seconds(tv.tv_sec) + microseconds(tv.tv_usec));
+#endif // CLOCK_REALTIME
}
time_t
@@ -48,10 +62,26 @@ system_clock::from_time_t(time_t t) _NOEXCEPT
#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;
-#ifdef __APPLE__
+#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__)
+
// mach_absolute_time() * MachInfo.numer / MachInfo.denom is the number of
// nanoseconds since the computer booted up. MachInfo.numer and MachInfo.denom
// are run time constants supplied by the OS. This clock has no relationship
@@ -108,23 +138,9 @@ steady_clock::now() _NOEXCEPT
return time_point(duration(fp()));
}
-#else // __APPLE__
-// FIXME: if _LIBCPP_HAS_NO_MONOTONIC_CLOCK, then clock_gettime isn't going to
-// work. It may be possible to fall back on something else, depending on the system.
-
-// 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.
-
-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));
-}
-#endif // __APPLE__
+#else
+#error "Monotonic clock not implemented"
+#endif
#endif // !_LIBCPP_HAS_NO_MONOTONIC_CLOCK