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The ops vector / protocol API/ABI were meant to support external
implementations, but we have moved away from having pluggable protocols,
and we aren't likely to support it any time soon.
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This changes the header files mostly in the protocols to include
directly rather than through the commmon nng_impl.h header. This
should lead to faster compiles, and by properly making all includes
relative should reduce friction with language servers and other tooling.
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Also, some instances nni_aio are changed to nng_aio. We think we want to harmonize
some of these types going forward as it will reduce the need to include headers
hopefully letting us get away with just "defs.h" in more places.
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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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The API is identical, except that some names have changed, and this is now a
header library in `nng/args.h` - so the core library does not need to carry this
code in binaries. Being a header library also means it is not necessary to
link against NNG, and it does not include any parts of NNG; it only depends on
a standard C99 or C11 environment.
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This aligns more closely with the nng_ctx functions.
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This should simplify things for developers. Just one header to include
in most cases now.
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This error code results when an AIO is stopped permanently, as a result
of nni_aio_close or nni_aio_stop. The associated AIO object cannot be
used again. This discrimantes against a file being closed, or a temporary
cancellation which might allow the aio to be reused.
Consumers must check for this error status in their callbacks, and not
resubmit an operation that failed with this error. Doing so, will result
in an infinite loop of submit / errors.
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Once a context has started the process of close, further attempts
to close it will return NNG_ECLOSED. What was I thinking to ever
do anything else?
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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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The main purpose is to eliminate the NNI_TYPE_OPAQUE options,
by putting these into their own first class, protocol-specific, functions.
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Similar to the other identities, this simplifies code a bit.
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Socket options were a little awkward, and these are core properties
of the socket. Few if any applications need these. This also avoids
some dynamic allocations.
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These options are removed entirely, and their functionality is now
available via special functions, `nng_socket_get_send_poll_fd` and
`nng_socket_get_recv_poll_fd`, making these first class methods on
the socket.
This eliminates a bit of wasteful code, and provides type safety
for these methods.
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This should help the compiler enforce checks, and may result
in better optimizations.
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Credit goes to Wu Xuan (@willwu1217) for diagnosing and proposing
a fix as part of #1695. This approach takes a revised approach
to avoid adding extra memory, and it also is slightly faster as we
do not need to update both pointers in the linked list, by reusing
the reap node.
As part of this a new internal API, nni_aio_completions, is introduced.
In all likelihood we will be able to use this to solve some similar
crashes in other areas of the code.
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This makes these functions entirely bullet proof, and eliminates
yet more error handling cases.
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This allows us to make nni_lmq_init() non-failing. (Although
the buffer size requested at initialization might not be granted.)
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This eliminates more failure paths, and brings us still closer
to eliminating the possibility of failure during socket init.
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In case sub0_ctx_subscribe is called to subscribe to _all_ topics
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This is not quite complete, but it sets the stage for other
protocols (such as zmq or mqtt) to be added to the project.
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