| Commit message (Collapse) | Author | Age |
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This fixes one major problem, which was that if nni_fini() was called
once on Windows, it would not be further possible to call nni_init().
While here fixed a few compilation issues.
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This creates a use-after-free bug if nni_fini() is run, then new
sockets are created.
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We never set the fd->sn_init member, causing new fds to be allocated
on each request for a new pollfd, and causing old ones to leak, and
worse may be even to not get notified. While here, we arrange for
a bit richer testing against the various options.
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This makes the operations that work on headers start with
nni_msg_header or nng_msg_header. It also renames _trunc to
_chop (same strlen as _trim), and renames prepend to insert.
We add a shorthand for clearing message content, and make
better use of the endian safe 32-bit accessors too.
This also fixes a bug in inserting large headers into messages.
A test suite for message handling is included.
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The PAIR_V1 protocol supports both raw and cooked modes, and has loop
prevention included. It also has a polyamorous mode, wherein it allows
multiple connections to be established. In polyamorous mode (set by
an option), the sender requests a paritcular pipe by setting it on the
message.
We default to PAIR_V1 now.
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A little benchmarking showed that we were encountering far too many
wakeups, leading to severe performance degradation; we had a bunch
of threads all sleeping on the same condition variable (taskqs)
and this woke them all up, resulting in heavy mutex contention.
Since we only need one of the threads to wake, and we don't care which
one, let's just wake only one. This reduced RTT latency from about
240 us down to about 30 s. (1/8 of the former cost.)
There's still a bunch of tuning to do; performance remains worse than
we would like.
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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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We automatically register inproc, TCP, and IPC. We can add more now
by just calling nni_tran_register(). (There is no unregister support.)
This requires transports to have access to the AIO framework (so that needs
to be something we consider), and a few nni_sock calls to get socket options.
Going forward we should version the ops vectors, and move to pushing down
transport options from the framework via setopt calls -- there is no reason
really that transports need to know all these.
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For now we have problems with TCP tests racing against each
other and this can lead to failures due to port use. In the
old nanomsg repo we assigned several different port numbers on
the command line, but we lack that here generally. However, we
feel that parallel testing is of little merit; its better to
build dedicated stress tests if that is what is desired.
We also use the matrix stuff a bit more sensibly, only installing
packages we actually use. This will likely lead to shorter startup
times.
Finally we cleaned up the environment so that we have sane defaults
for most environment variables.
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Also, we need to nn_close(), because the close can reasonably
race against nn_term(), causing false test failures.
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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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There are no guarantees about message ordering when multiple
sockets are involved. Adding a delay doesn't fix the lack of
a guarantee, but makes it sufficiently unlikely to be violated
to suit our test purposes.
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The finish routine can race against an asynchronous cancellation,
so we must not clear the data pointer, or we can wind up with a
NULL pointer dereference.
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We noticed a bug in the surveyor handling of the options; this fixes
that. At the same time, we noticed a race condition in the setting
of the error for future calls, a short sleep seems to cure it. This
distinction (ESTATE vs ETIMEDOUT) is pretty annoying, and it would be
better to have a different way to handle it. More work here is
warranted.
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We introduced the compat_msg.c from the old msg.c in the nanomsg
repo. While here, we found that the handling for send() was badly
wrong, by a level of indirection. We simplified the code to so that
nn_send() and nn_recv() are simple wrappers around the nn_sendmsg()
and nn_recvmsg() APIs (as in old nanomsg). This may not be quite as
fast, but it's more likely to be correct and reduces complexity.
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We use codecov.io; this seems to work well.
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To disable check, specify CLANG_FORMAT as off, no, or skip.
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