| Commit message (Collapse) | Author | Age |
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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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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 one is caused by us deallocating the msg queue before we
stop all asynchronous I/O operations; consequently we can wind
up with a thread trying to access a msg queue after it has been
destroyed.
A lesson here is that nni_aio_fini() needs to be treated much like
nni_thr_fini() - you should do this *before* deallocating anything
that callback functions might be referencing.
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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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This fixes several issues, and brings PUB/SUB to operational
correctness. Included is test code to verify that.
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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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