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fixes #599 nng_dial sync should not return until added to socket
This reintroduces the changes for the above fixes, building upon the
transport modifications that we have made to eliminate the separate
transport pipe start entry point. It also includes slightly reworked
code during start to put a hold on the pipe when it is created, which
we we drop at the end, hopefully fixing a use-after-free.
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This changeset needs work. We are seeing errors described by
This reverts commit d7f7c896c0ede24249ef63b1e45b1878bf4bd473.
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fixes #208 pipe start should occur before connect / accept
fixes #616 Race condition closing between header & body
This refactors the transports to handle their own connection
handshaking before passing the pipe to the socket. This
changes and simplifies the setup. This also fixes a rather
challenging race condition described by #616.
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fixes #170 Make more use of reaper
This is a complete restructure/rethink of how child objects interact
with the socket. (This also backs out #576 as it turns out not to be
needed.) While 568 says reader/writer lock, for now we have settled
for a single writer lock. Its likely that this is sufficient.
Essentially we use the single socket lock to guard lists of the socket
children. We also use deferred deletion in the idhash to facilitate
teardown, which means endpoint closes are no longer synchronous.
We use the reaper to clean up objects when the reference count drops
to zero. We make a special exception for pipes, since they really
are not reference counted by their parents, and they are leaf objects
anyway.
We believe this addresses the main outstanding race conditions in
a much more correct and holistic way.
Note that endpoint shutdown is a little tricky, as it makes use of
atomic flags to guard against double entry, and against recursive
lock entry. This is something that would be nice to make a bit more
obvious, but what we have is safe, and the complexity is at least
confined to one place.
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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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fixes #565 Option getting should validate sizes more aggressively
fixes #563 Reconnect timeouts should be settable on dialers
fixes #562 pipe test is fragile
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This separates the plumbing for endpoints into distinct
dialer and listeners. Some of the transports could benefit
from further separation, but we've done some rather larger
separation e.g. for the websocket transport.
IPC would be a good one to update later, when we start looking
at exposing a more natural underlying API.
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