LIU Hao wrote: > 在 2026-9-12 22:24, Kirill Makurin 写道: >> Hello, >> > When I was getting more familiar with winpthreads' source code back in May, > wrappers `_pthread_wait_for_single_object` and > `_pthread_wait_for_multiple_objects ` caught my attention. They were added in > this commit[1]. >> >> How bad is precision of `WaitForSingleObject` and `WaitForMultipleObjects `? >> They accept timeout in milliseconds; `SYSTEMTIME` supports millisecond >> resolution; `FILETIME` uses sub-microsecond resolution (if converted from >> `SYSTEMTIME`, sub-millisecond part is likely lost); so how bad can it be? I >> assume it may be the case for older Windows versions or old hardware? >> >> I'm simply curious and by no means I suggest that we remove them. > > By default the granularity is 15-16 milliseconds; so if you request one > millisecond, it usually takes > 15-16 milliseconds, and intermittently up to 40 milliseconds.
Thanks for the information. It seems like it roughly matches precision of GetTickCount*, which according to this article[1], is 10-16ms. > The granularity can be decreased with `timeBeginPeriod()`, down to one > millisecond. - Kirill Makurin [1] https://learn.microsoft.com/en-us/windows/win32/sysinfo/windows-time _______________________________________________ Mingw-w64-public mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/mingw-w64-public
