| Commit message (Collapse) | Author | Age |
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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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The only thing using this was the transport lookups, but as
those transports are now fully initialized in nng_init, we
no longer need to lock that at all.
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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 should help greatly with performance on older systems such
as CentOS 7 and GCC 4.8. Though, such folks really should update
to newer compilers. Folks running version of GCC earlier than 4.7
will still pay a rather significant performance penalty, as they
still implement atomics with a global mutex.
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This eliminates some run-time initialization, moving it to compile time.
Additional follow up work will expand on this to simplify initialization
and reduce the need for certain locks.
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This is initially used for TLS to make loading the engine pointer
faster, eliminating a much more expensive lock operation.
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This provides the initial implementation, and converts the
transport lookup routines to use it. This is probably of limited
performance benefit, but rwlock's may be useful in further future work.
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fixes #1326 Linux IPC could use fchmod
fixes #1327 getsockname on ipc may not work
This introduces an abstract:// style transport, which on Linux
results in using the abstract socket with the given name (not
including the leading NULL byte). A new NNG_AF_ABSTRACT is
provided. Auto bind abstract sockets are also supported.
While here we have inlined the aios for the POSIX ipc pipe
objects, eliminating at least one set of failure paths, and
have also performed various other cleanups.
A unix:// alias is available on POSIX systems, which acts just
like ipc:// (and is fact just an alias). This is supplied so
that in the future we can add support for AF_UNIX on Windows.
We've also absorbed the ipcperms test into the new ipc_test suite.
Finally we are now enforcing that IPC path names on Windows are
not over the maximum size, rather than just silently truncating
them.
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The TTL in these cases should have been atomic. To facilitate
things we actually introduce an atomic int for convenience. We
also introduce a convenience nni_msg_must_append_u32() and
nni_msg_header_must_append_u32(), so that we can eliminate some
failure tests that cannot ever happen. Combined with a new test
for xreq, we have 100% coverage for xreq and more coverage for
the other REQ/REP protocols.
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This also introduces a new atomic boolean type, so we can use that
to trigger whether we've added the HTTP handler or not.
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fixes #573 atomic flags could help
This introduces a new atomic flag, and reduces some of the global
locking. The lock refactoring work is not yet complete, but this is
a positive step forward, and should help with certain things.
While here we also fixed a compile warning due to incorrect types.
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The fallback logic was unnecessarily complicated, and found to be
somewhat data-racy; on modern systems initializing these things
never fails, and on BSD systems that only occurs under extreme
memory shortage.
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fixes #267 zerotier transport should lock ZT_HOME
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We enabled verbose compiler warnings, and found a lot of issues.
Some of these were even real bugs. As a bonus, we actually save
some initialization steps in the compat layer, and avoid passing
some variables we don't need.
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This changes the backend (internal) HTTP API to provide a much more
sensible handler scheme, where the handlers are opaque objects and we
can allocate a handler for different types of tasks.
We've also added support serving up directories of static content, and
added code to validate that the directory serving is working as intended.
This is a key enabling step towards the public API.
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We only compile files that are appropriate for the platform. (We
still have guards in place, to allow for a future single .C file
to be built from all the sources.) We also remove the subsystem defines;
if a new platform needs to deviate from POSIX in ways beyond what we
intended here, then that platform should just copy those parts into
a new platform directory, rather than cross including portions from
POSIX.
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If the underlying platform fails (FreeBSD is the only one I'm aware
of that does this!), we use a global lock or condition variable instead.
This means that our lock initializers never ever fail.
Probably we could eliminate most of this for Linux and Darwin, since
on those platforms, mutex and condvar initialization reasonably never
fails. Initial benchmarks show little difference either way -- so we
can revisit (optimize) later.
This removes a lot of otherwise untested code in error cases and so forth,
improving coverage and resilience in the face of allocation failures.
Platforms other than POSIX should follow a similar pattern if they need
this. (VxWorks, I'm thinking of you.) Most sane platforms won't have
an issue here, since normally these initializations do not need to allocate
memory. (Reportedly, even FreeBSD has plans to "fix" this in libthr2.)
While here, some bugs were fixed in initialization & teardown.
The fallback code is properly tested with dedicated test cases.
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This includes async send and recv, driven from the poller. This will
be requierd to support the underlying UDP and ZeroTier transports in
the future. (ZeroTier is getting done first.)
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This eliminates the two threads per pipe that were being used to provide
basic I/O handling, replacing them with a single global thread for now,
that uses poll and nonblocking I/O. This should lead to great scalability.
The infrastructure is in place to easily expand to multiple polling worker
threads. Some thought needs to be given about how to scale this to engage
multiple CPUs. Horizontal scaling may also shorten the poll() lists easing
C10K problem.
We should look into better solutions than poll() for platforms that have
them (epoll on Linux, kqueue on BSD, and event ports on illumos).
Note that the file descriptors start out in blocking mode for now, but
then are placed into non-blocking mode. This is because the negotiation
phase is not yet callback driven, and so needs to be synchronous.
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As with TCP, we're still using threads under the hood. But this
completes the send/recv logic conversion for POSIX to our AIO framework,
and hence represents a substantial milestone towards full asyncronous
operation.
We still need to do accept/connect operations asynchronously, then making.
Windows overlapped IO work properly. After that, poll/epoll/kqueue, etc.
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Transport-level pipe initialization is now sepearate and explicit.
The POSIX send/recv logic still uses threads under the hood, but
makes use of the AIO framework for send/recv. This is a key stepping
stone towards enabling poll() or similar async I/O approaches.
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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 also adds checks in the protocols to verify that pipe peers
are of the proper protocol.
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This may also address a race in closing down pipes. Now pipes are always
registered with the socket. They also always have both a sender and receiver
thread. If the protocol doesn't need one or the other, the stock thread just
exits early.
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code with uncrustify. (Minor adjustments.) No more arguments!
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