<div dir="auto">Wouldn't it be better to introduce a __libcpp_thread_nanosleep() API call here?<div dir="auto"><br></div><div dir="auto">I bumped into a similar issue with a custom thread implementation and have a downstream patch like that.</div><div dir="auto"><br></div><div dir="auto">Cheers,</div><div dir="auto"><br></div><div dir="auto">/ Asiri</div><div dir="auto"><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On 7 Jan 2017 2:59 a.m., "Saleem Abdulrasool via cfe-commits" <<a href="mailto:cfe-commits@lists.llvm.org">cfe-commits@lists.llvm.org</a>> wrote:<br type="attribution"><blockquote class="quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Author: compnerd<br>
Date: Fri Jan  6 20:48:30 2017<br>
New Revision: 291331<br>
<br>
URL: <a href="http://llvm.org/viewvc/llvm-project?rev=291331&view=rev" rel="noreferrer" target="_blank">http://llvm.org/viewvc/llvm-<wbr>project?rev=291331&view=rev</a><br>
Log:<br>
thread: implement sleep_for on Windows<br>
<br>
Windows does not provide an implementation of `nanosleep`.  Round up the<br>
time duration to the nearest ms and use `Sleep`.  Although this may<br>
over-sleep, there is no hard real-time guarantee on the wake, so<br>
sleeping a bit more is better than under-sleeping as it within the<br>
specification.<br>
<br>
Modified:<br>
    libcxx/trunk/src/thread.cpp<br>
<br>
Modified: libcxx/trunk/src/thread.cpp<br>
URL: <a href="http://llvm.org/viewvc/llvm-project/libcxx/trunk/src/thread.cpp?rev=291331&r1=291330&r2=291331&view=diff" rel="noreferrer" target="_blank">http://llvm.org/viewvc/llvm-<wbr>project/libcxx/trunk/src/<wbr>thread.cpp?rev=291331&r1=<wbr>291330&r2=291331&view=diff</a><br>
==============================<wbr>==============================<wbr>==================<br>
--- libcxx/trunk/src/thread.cpp (original)<br>
+++ libcxx/trunk/src/thread.cpp Fri Jan  6 20:48:30 2017<br>
@@ -117,6 +117,12 @@ sleep_for(const chrono::nanoseconds& ns)<br>
     using namespace chrono;<br>
     if (ns > nanoseconds::zero())<br>
     {<br>
+#if defined(_LIBCPP_WIN32API)<br>
+        milliseconds ms = duration_cast<milliseconds>(<wbr>ns);<br>
+        if (ns > duration_cast<nanoseconds>(ms)<wbr>)<br>
+          ++ms;<br>
+        Sleep(ms.count());<br>
+#else<br>
         seconds s = duration_cast<seconds>(ns);<br>
         timespec ts;<br>
         typedef decltype(ts.tv_sec) ts_sec;<br>
@@ -134,6 +140,7 @@ sleep_for(const chrono::nanoseconds& ns)<br>
<br>
         while (nanosleep(&ts, &ts) == -1 && errno == EINTR)<br>
             ;<br>
+#endif<br>
     }<br>
 }<br>
<br>
<br>
<br>
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</blockquote></div><br></div>