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Marc Alexander Lehmann 11 years ago
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      ev.pod

5
ev.pod

@ -465,8 +465,9 @@ epoll scales either O(1) or O(active_fds).
The epoll mechanism deserves honorable mention as the most misdesigned
of the more advanced event mechanisms: mere annoyances include silently
dropping file descriptors, requiring a system call per change per file
descriptor (and unnecessary guessing of parameters), problems with dup and
so on. The biggest issue is fork races, however - if a program forks then
descriptor (and unnecessary guessing of parameters), problems with dup,
returning before the timeout value requiring additional iterations and so
on. The biggest issue is fork races, however - if a program forks then
I<both> parent and child process have to recreate the epoll set, which can
take considerable time (one syscall per file descriptor) and is of course
hard to detect.

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