| Commit message (Collapse) | Author | Age |
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We introduced richer, deeper tests for UDP functionality.
These tests uncovered a number of issues which this commit fixes.
The Windows IOCP code needs to support multiple aios on a single
nni_win_event. A redesign of the IOCP handling addresses that.
The POSIX UDP code also needed fixes; foremost among them is the
fact that the UDP file descriptor is not placed into non-blocking
mode, leading to potential hangs.
A number of race conditions and bugs along the implementation of
the above items were uncovered and fixed. To the best of our knowledge
the current code is bug-free.
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This implements the basic UDP functionality for Windows (required
for ZeroTier for example). We have also introduced a UDP test suite
to validate that this actually works. While here a few Windows
compilation warnings / nits were fixed.
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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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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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This is only lightly tested, and I expect that there remain
some race conditions. Endpoint logic in particular needs
work.
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We are still seeing likely errors with pipes outliving their associated
endpoints, so work is still needed here.
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The IOCP code has been refactored to improve reuse, and hopefully
will be easier to use with TCP now. Windows IPC using Named Pipes
is mostly working -- mostly because there is a gnarly close-race.
It seems that we need to take some more care to ensure that the
pipe is not released while requests may be outstanding -- so some
deeper synchronization between the IOCP callback logic and the
win_event code is needed. In short, we need to add a condvar to
the event, and notice when we have submitted work for async completion,
and make sure we flag the event "idle" after either completion or
cancellation of the event.
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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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I seem to be having a very difficult time getting dual-stack sockets
to function properly on Windows. I've sort of abandoned it for now.
I need to think about how to solve this -- it's not clear to me
right now whether dual stack sockets are the right answer or not.
People do expect these to work, but a tcp6:// url might be more
elegant.
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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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There are lots of changes here, mostly stuff we did in support of
Windows TCP. However, there are some bugs that were fixed, and we
added some new error codes, and generalized the handling of some failures
during accept. Windows IPC (NamedPipes) is still missing.
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Windows is getting there. Needs a couple of more more hours to enable
everything, especially IPC, and most of the work at this point is probably
some combination of debug and tweaking things like error handling.
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