Bruce M Simpson
bms at spc.org
Sat Oct 23 15:06:20 PDT 2004
On Sat, Oct 23, 2004 at 09:52:18AM -0700, Ronald F. Guilmette wrote:
> or kevent(), or aio_suspend(). Thus, I still do believe that the judicious
> use of the aio_*() functions with signaling could support a dramatically
> different programming style, especially for complex network clients and/or
> servers that must monitor and respond to events on various kinds of socket
> connections, all in the same single program.
As was pointed out earlier, it requires POSIX realtime signal support to
become useful in this way.
I have programmed in this way under Solaris, for what it's worth; I
implemented an httpd server using aio calls and real-time signals a
few years ago, and the performance as compared to a select()/poll()
based server turned out to be far worse, at least in terms of the
number of requests per second it was able to handle. I don't recall
So I would regard it as largely a red herring; the kqueue/kevent
mechanism will yield somewhat finer granularity in terms of polling
for an i/o completion event from userland on FreeBSD, which seems to
be what you're trying to achieve.
aio and realtime signals is something we don't really do at the moment.
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