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thread: implement sleep_for on Windows

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Windows does not provide an implementation of `nanosleep`.  Round up the
time duration to the nearest ms and use `Sleep`.  Although this may
over-sleep, there is no hard real-time guarantee on the wake, so
sleeping a bit more is better than under-sleeping as it within the
specification.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@291331 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Saleem Abdulrasool
2017-01-07 02:48:30 +00:00
parent 2342c11c50
commit cc1d780758
1 changed files with 7 additions and 0 deletions
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7
src/thread.cpp
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@@ -117,6 +117,12 @@ sleep_for(const chrono::nanoseconds& ns)
using namespace chrono; using namespace chrono;
if (ns > nanoseconds::zero()) if (ns > nanoseconds::zero())
{ {
#if defined(_LIBCPP_WIN32API)
milliseconds ms = duration_cast<milliseconds>(ns);
if (ns > duration_cast<nanoseconds>(ms))
++ms;
Sleep(ms.count());
#else
seconds s = duration_cast<seconds>(ns); seconds s = duration_cast<seconds>(ns);
timespec ts; timespec ts;
typedef decltype(ts.tv_sec) ts_sec; typedef decltype(ts.tv_sec) ts_sec;
@@ -134,6 +140,7 @@ sleep_for(const chrono::nanoseconds& ns)
while (nanosleep(&ts, &ts) == -1 && errno == EINTR) while (nanosleep(&ts, &ts) == -1 && errno == EINTR)
; ;
#endif
} }
} }