[Bug 17195] NamedPipe datagrams need to be _really_ datagrams

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=17195

--- Comment #149 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
hi adam,

i've been investigating alternative options.  one of them is posix ipc queues.
posix ipc queues have exactly the same semantics (itliterally) as message-mode
named pipes.  there are however a number of problems with posix ipc queues.
firstly, they tend not to have been implemented correctly.  secondly,
clean-up is a bitch.  there is typically no way to *enumerate* the ipc
queues despite them being like files!  thirdly, the limit is around
8k whereas namedpipe in messagemode is something like a 64k message size
limit.

so, using posix ipc queues would be a bit fraught, but technically would
be [one of the very few] the correct things to use, even as a means to pass
e.g. just the length of the message to be read from the socket.  what is
nice about posix ipc queues is that they have an equivalent of poll, so you
can tell whether there is a message waiting, at least, or, better, use them
to block the user process (pending a message), instead of blocking the (single)
wineserver process (which you would otherwise have to multi-thread in order
to get the correct semantics required, here).

but, first, we have to get jiullard to stop putting pride, anger and
hate ahead of technical analysis and decisions.  someone else
(other than me) basically needs to stand up to him.

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