| Commit message (Collapse) | Author | Age |
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fixes #23 Restore the old idhash logic for sockets
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fixes #38 Make protocols "pluggable", or at least optional
This is a breaking change, as we've done away with the central
registered list of protocols, and instead demand the user call
nng_xxx_open() where xxx is a protocol name. (We did keep a
table around in the compat framework though.)
There is a nice way for protocols to plug in via
an nni_proto_open(), where they can use a generic constructor
that they use to build a protocol specific constructor (passing
their ops vector in.)
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Hop counts for REQ were busted (bad TTL), and imported the
compat_reqtll test. At the same time, added code to nn_term
to shut down completely, discarding sockets. (Note that some
things, such as globals, may still be left around; that's ok.)
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We need to remember that protocol stops can run synchronously, and
therefore we need to wait for the aio to complete. Further, we need
to break apart shutting down aio activity from deallocation, as we need
to shut down *all* async activity before deallocating *anything*.
Noticed that we had a pipe race in the surveyor pattern too.
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This cleans up the pipe creation logic greatly, and eliminates
a nasty potential deadlock (lock-order incorrect.) It also
adds a corret binary exponential and randomized backoff on both
accept and connect.
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This actually is breaking at the moment, because we don't have
good integration with timeouts, and there are some frustrating
races with timeouts at points that can cause apparent hangs.
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This logic leaves a race condition in the dial side, which will
be fixed with a subsequent change to convert that to fully asynchronous
as well.
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We still have endpoint related races apparently; we need to examine
the possibility of handling endpoints much like we do pipes, which seem
to be race free.
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This adds nn_device and nng_device. There were some internal changes
required to fix shutdown / close issues. Note that we shut down the
sockets when exiting from device -- this is required to make both threads
see the failure and bail, since we are not using a single event loop.
I also noticed that the bus protocol had a bug where it would send
messages back to the originator. This was specifically tested for in
the compat_device test, and we have fixed it.
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The CMSG handling was completely borked. This is fixed now, and
we stash the SP header size (ugh) in the CMSG contents to match what
nanomsg does. We now pass the cmsg validation test.
We also fixed handling of certain endpoint-related options, so that
endpoints can get options from the socket at initialization time.
This required a minor change to the transport API for endpoints.
Finally, we fixed a critical fault in the REP handling of RAW sockets,
which caused them to always return NNG_ESTATE in all cases. It should
now honor the actual socket option.
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This does a few things. First it closes some preexisting leaks.
Second it tightens the overall close logic so that we automatically
discard idhash resources (while keeping numeric values for next id
etc. around) when the last socket is closed. This then eliminates
the need for applications to ever explicitly terminate resources.
It turns out platform-specific resources established at nni_init()
time might still be leaked, but it's also the case that we now no
longer dynamically allocate anything at platform initialization time.
(This presumes that the platform doesn't do so under the hood when
creating critical sections or mutexes for example.)
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This gives a better idea of pipe ID uniqueness, and is a step towards
conversion of the API to use IDs instead of pointers.
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This change provides for a private callback in the message queues,
which can be used to notify the socket, and which than arranges for
the appropriate event thread to run.
Upper layer hooks to access this still need to be written.
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This compiles correctly, but doesn't actually deliver events yet.
As part of this, I've made most of the initializables in nng
safe to tear-down if uninitialized (or set to zero e.g. via calloc).
This makes it loads easier to write the teardown on error code, since
I can deinit everything, without worrying about which things have been
initialized and which have not.
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This should eliminate all need for protocols to do their own
thread management tasks.
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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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Also we added a two phase shutdown for threads.
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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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The use of platform_next_id was a bit off, because it could give
back pipe IDs that were too large (the high order bit must be
clear), and in very long running applications serving many
connections, the IDs could wrap and lead to duplicates.
Also we have added functions to set the recverr or senderr values,
which can be used by protocols -- either during initialization,
or during filters. (REQ uses this for example.)
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