[lldb] Fix premature MainLoop wakeup on windows

[labath]

The windows system APIs only take milliseconds. Make sure we round the sleep interval (in nanoseconds) upwards.

[llvmbot]

@llvm/pr-subscribers-lldb

Author: Pavel Labath (labath)

Changes

The windows system APIs only take milliseconds. Make sure we round the sleep interval (in nanoseconds) upwards.

---

Full diff: https://github.com/llvm/llvm-project/pull/117756.diff

1 Files Affected:

• (modified) lldb/source/Host/windows/MainLoopWindows.cpp (+1-1)

diff --git a/lldb/source/Host/windows/MainLoopWindows.cpp b/lldb/source/Host/windows/MainLoopWindows.cpp
index 0a5a35e9db9dde..f3ab2a710cd014 100644
--- a/lldb/source/Host/windows/MainLoopWindows.cpp
+++ b/lldb/source/Host/windows/MainLoopWindows.cpp
@@ -28,7 +28,7 @@ static DWORD ToTimeout(std::optional<MainLoopWindows::TimePoint> point) {
     return WSA_INFINITE;
 
   nanoseconds dur = (std::max)(*point - steady_clock::now(), nanoseconds(0));
-  return duration_cast<milliseconds>(dur).count();
+  return ceil<milliseconds>(dur).count();
 }
 
 MainLoopWindows::MainLoopWindows() {

[labath]

(I haven't tested it, but I'm fairly certain it should fix the problem in #112895 (comment))

[DavidSpickett]

LGTM, thanks.

I'll keep an eye on the buildbot.