| Commit message (Collapse) | Author | Age |
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While here we also fixed a bug in the --file handling that we noticed
while writing the TLS handling.
We also fixed a warning in the core (msgqueue) for set but unused variables.
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This introduces enough of the HTTP API to support fully server
applications, including creation of websocket style protocols,
pluggable handlers, and so forth.
We have also introduced scatter/gather I/O (rudimentary) for
aios, and made other enhancements to the AIO framework. The
internals of the AIOs themselves are now fully private, and we
have eliminated the aio->a_addr member, with plans to remove the
pipe and possibly message members as well.
A few other minor issues were found and fixed as well.
The HTTP API includes request, response, and connection objects,
which can be used with both servers and clients. It also defines
the HTTP server and handler objects, which support server applications.
Support for client applications will require a client object to be
exposed, and that should be happening shortly.
None of this is "documented" yet, bug again, we will follow up shortly.
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This makes all the protocols and transports optional. All
of them except ZeroTier are enabled by default, but you can
now disable them (remove from the build) with cmake options.
The test suite is modified so that tests still run as much
as they can, but skip over things caused by missing functionality
from the library (due to configuration).
Further, the constant definitions and prototypes for functions
that are specific to transports or protocols are moved into
appropriate headers, which should be included directly by
applications wishing to use these.
We have also added and improved documentation -- all of the
transports are documented, and several more man pages for
protocols have been added. (Req/Rep and Surveyor are still
missing.)
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This eliminates the "quasi-functional" notify API altogether.
The aio framework will be coming soon to replace it.
As a bonus, apps (legacy apps) that use the notification FDs
will see improved performance, since we don't have to context
switch to give them a notification.
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We allocate AIO structures dynamically, so that we can use them
abstractly in more places without inlining them. This will be used
for the ZeroTier transport to allow us to create operations consisting
of just the AIO. Furthermore, we provide accessors for some of the
aio members, in the hopes that we will be able to wrap these for
"safe" version of the AIO capability to export to applications, and
to protocol and transport implementors.
While here we cleaned up the protocol details to use consistently
shorter names (no nni_ prefix for static symbols needed), and we
also fixed a bug in the surveyor code.
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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 passes valgrind 100% clean for both helgrind and deep leak
checks. This represents a complete rethink of how the AIOs work,
and much simpler synchronization; the provider API is a bit simpler
to boot, as a number of failure modes have been simply eliminated.
While here a few other minor bugs were squashed.
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We closed a few subtle races in the AIO subsystem as well, and now
we were able to eliminate the separate timer handling the MQ code.
There appear to be some opportunities to further enhance the code
for MQs as well -- eventually probably the only access to MQs will
be with AIOs.
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Modern Windows (Vista and later) have light weight Slim Read/Write locks
which only occupy 64 bits, and don't require any memory allocation to
create.
While here clean up a few more unreferenced variables found with the
Microsoft compilers.
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This change provides for a private callback in the message queues,
which can be used to notify the socket, and which than arranges for
the appropriate event thread to run.
Upper layer hooks to access this still need to be written.
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As part of this, we've added a way to unblock callers in a message
queue with an error, even without a signal channel. This was necessary
to interrupt blockers upon survey timeout. They will get NNG_ETIMEDOUT,
but afterwards callers get NNG_ESTATE.
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This function is called when we wish to return a message to the
queue after examining it. It can also be used by the resender in
the REQ protocol. Critically it does not disrupt the ordering
of other messages. This is a non-blocking operation.
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This fixes a few core issues, and improves readability for the
message queue code as well. inproc delivery of messages works
now.
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