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This is part of our work to improve type safety/awareness, and also
improve debugger support, for NNG error codes. There are still quite
a few more but this should help.
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This avoids the need to perform multiple allocations for dialing,
eliminating additional potential failures. Cancellation is also
made simpler and more perfectly robust.
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The endpoints both use a nesting level for some common code and some
platform dependent code. But the common code isn't that much and we
have similar patterns for e.g. IPC.
This avoids a layer of indirection in the structs, and extra allocations.
The payoff will be even larger for the dialers, but that is next.
(Dialers are more complicated because of DNS.)
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This will replace nni_aio_schedule, and it includes finishing the
task if needed. It does so without dropping the lock and so is
more efficient and race free.
This includes some conversion of some subsystems to it.
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This allows us to explicitly stop streams, dialers, and listeners,
before we start tearing down things. This hopefully will be useful
in resolving use-after-free bugs in http, tls, and websockets.
The new functions are not yet documented, but they are
nng_stream_stop, nng_stream_dialer_stop, and nng_stream_listener_stop.
They should be called after close, and before free. The close
functions now close without blocking, but the stop function is
allowed to block.
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The idea here is to reduce the dynamic allocations used for
URLs, and also the back and forth with parsing begin strings
and port numbers. We always resolve to a port number, and
this is easier for everyone.
The real goal in the long term is to eliminate dynamic allocation
of the URL fields altogether, but that requires a little more
work. This is a step in the right direction.
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Applications must now call nng_init(), but they can supply
a set of parameters optionally. The code is now safe for
multiple libraries to do this concurrently, meaning nng_fini
no longer can race against another instance starting up.
The nni_init checks on all public APIs are removed now.
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This will be used in UDP. It also lets us reduce some unnecessary
code paths for redundant library initialization.
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This was only used internally, and can live as part of core.
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