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Comparing libev/ev.pod (file contents):
Revision 1.426 by root, Sat Feb 23 23:06:40 2013 UTC vs.
Revision 1.427 by root, Sun Apr 28 14:57:12 2013 UTC

… …
396 396
397If this flag bit is or'ed into the flag value (or the program runs setuid 397If this flag bit is or'ed into the flag value (or the program runs setuid
398or setgid) then libev will I<not> look at the environment variable 398or setgid) then libev will I<not> look at the environment variable
399C<LIBEV_FLAGS>. Otherwise (the default), this environment variable will 399C<LIBEV_FLAGS>. Otherwise (the default), this environment variable will
400override the flags completely if it is found in the environment. This is 400override the flags completely if it is found in the environment. This is
401useful to try out specific backends to test their performance, or to work 401useful to try out specific backends to test their performance, to work
402around bugs. 402around bugs, or to make libev threadsafe (accessing environment variables
403cannot be done in a threadsafe way, but usually it works if no other
404thread modifies them).
403 405
404=item C<EVFLAG_FORKCHECK> 406=item C<EVFLAG_FORKCHECK>
405 407
406Instead of calling C<ev_loop_fork> manually after a fork, you can also 408Instead of calling C<ev_loop_fork> manually after a fork, you can also
407make libev check for a fork in each iteration by enabling this flag. 409make libev check for a fork in each iteration by enabling this flag.

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