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If this happens:
- two sockets are readable, and select/epoll/aio returns both of
them
- read event on socket1 is called
- inside that read event an event_loop_once is called, this returns that
socket2 is readable
- read event on socket2 is called
- event_loop_once returns
- top level event handler then calls read event on socket2 (as it
still has that listed as readable)
- read handler for socket2 returns zero byte read, which is
interpreted as end of file
- socket is incorrectly closed
this happened with ctdb, but it could happen anywhere (just
rarely). The fix is trivial - ensure we break out of the event loop
when we have been called recursively.
(This used to be commit e042002bb5ee8974220e1ade56b64389571f75a6)
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Jeremy asked for this to allow Samba3 to use the Samba4 events library
see torture/local/event.c for an example
(This used to be commit 7e105482ff9a3da6b4708ff99a64f1881614fc5f)
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- make it easier to plug in a new events backend
- add simpler 'select' and 'epoll' backends
This is part of the effort to add good AIO support. The events_aio.c
backend is done, but sometimes dies with a SEGV, which is why it isn't
enabled yet.
(This used to be commit 934f18283dbc7958944931a93a854526bcd54884)
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