| Commit message (Collapse) | Author | Age |
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It turns out that I didn't quite understand overlapped I/O. We can and
should always do the GetOverlappedResult(), regardless of how the routine
returns.
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There are lots of changes here, mostly stuff we did in support of
Windows TCP. However, there are some bugs that were fixed, and we
added some new error codes, and generalized the handling of some failures
during accept. Windows IPC (NamedPipes) is still missing.
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Windows is getting there. Needs a couple of more more hours to enable
everything, especially IPC, and most of the work at this point is probably
some combination of debug and tweaking things like error handling.
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As part of this, we've added a way to unblock callers in a message
queue with an error, even without a signal channel. This was necessary
to interrupt blockers upon survey timeout. They will get NNG_ETIMEDOUT,
but afterwards callers get NNG_ESTATE.
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Platforms must seed the pRNGs by offering an nni_plat_seed_prng()
routine. Implementations for POSIX using various options (including
the /dev/urandom device) are supplied.
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This adds the surveyor protocol, and updates the respondent somewhat.
I've switched to using generic names for per-pipe and per-socket protocol
data. Hopefully this will make 'cut-n-paste' from other protocol
implementations easier.
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This should eliminate all need for protocols to do their own
thread management tasks.
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Don't drop the lock in sock_close while holding the pipe reference.
I'm pretty sure this is responsible for the use-after-free race.
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In an attempt to simplify the protocol implementation, and hopefully
track down a close related race, we've made it so that most protocols
need not worry about locks, and can access the socket lock if they do
need a lock. They also let the socket manage their workers, for the
most part. (The req protocol is special, since it needs a top level
work distributor, *and* a resender.)
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PUSH attempts to do a round-robin based distribution. However, I
noticed that there is a bug in REQ, because REQ sockets will continue
to pull down work until the first one no longer has room. This can
in theory lead to scheduliung imbalances when the load is very light.
(Under heavy load, the backpressure dominates.)
Also, I note that mangos suffers the same problem. It does not
make any attempt to deliver work equally, basically each pipe winds
up pulling messages until its own buffers are full. This is bad.
We can borrow the logic here for both REQ and mangos.
None of this is tested yet.
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The use of a single function to get both size and length actually
turned out to be awkward to use; better to have separate functions
to get each. While here, disable some of the initialization/fork
checks, because it turns out they aren't needed.
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Also we added a two phase shutdown for threads.
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This also adds checks in the protocols to verify that pipe peers
are of the proper protocol.
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This uncovered a few problems - inproc was not moving the headers
to the body on transmit, and the message chunk allocator had a serious
bug leading to memory corruption. I've also added a message dumper,
which turns out to be incredibly useful during debugging.
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