New: epoll & threads
https://bugzilla.kernel.org/show_bug.cgi?id=43072
Summary: epoll & threads
Product: Documentation
Version: unspecified
Kernel Version: n/a
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: man-pages
AssignedTo: documentation_man-pages-ztI5WcYan/[email protected]
ReportedBy: [email protected]
Regression: No
The manpages of epoll do not mention the behavior in the presence of multiple threads. By trying it out, I found out that the following works: if one thread does epoll_wait() on an epoll in which some fd was not registered at all, and blocks; and later another thread does epoll_ctl() to add the fd; then the fd will be reported by the original thread's epoll_wait() as soon as it meets the condition. This behavior is something that may be very useful in some situations. As far as I see, it cannot be achieved easily with select(). I think that it should be officially mentioned in the manpages (provided it is not an accident but works this way by design).
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[Bug 43072] epoll & threads
https://bugzilla.kernel.org/show_bug.cgi?id=43072
Michael Kerrisk <[email protected]> changed:
What |Removed |Added
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