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fixes #615 IPC close on Windows leaves handle open
This reintroduces the code to eradicate the separate transport
start function for IPC, as a incremental step towards the full
fix for 599 and 208. It also addresses 615, by including revised
logic for the handling of close.
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This adds a proper boolean condition for the pipe being closed
(removing the unused sending flag), and adds checks for both the
pipe closed and the socket closed flags at key points.
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fixes #622 incorrect assumptions about malloc(0)
Windows actually allocates an object of size zero when calling
malloc on size zero. This is unusual behavior, and we just
add logic to work more like malloc on POSIX systems.
Other systems can return non-NULL objects to fixed pages here.
We think the best option here is to uniformly return NULL from
our APIs in these circumstances, and to include testing to validate
that.
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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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On QNX, specifying a numeric servname while leaving ai_socktype unspecified would result in EAI_SERVICE.
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fixes #596 POSIX IPC should move away from pipedesc/epdesc
fixes #598 TLS and TCP listeners could support NNG_OPT_LOCADDR
fixes #594 Windows IPC should use "new style" win_io code.
fixes #597 macOS could support PEER PID
This large change set cleans up the IPC support on Windows and
POSIX. This has the beneficial impact of significantly reducing
the complexity of the code, reducing locking, increasing
concurrency (multiple dial and accepts can be outstanding now),
reducing context switches (we complete thins synchronously now).
While here we have added some missing option support, and fixed a
few more bugs that we found in the TCP code changes from last week.
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This also arranges for server shutdown to be handled using
the reaper, leading to more elegant cleanup.
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fixes #179 DNS resolution should be done at connect time
fixes #586 Windows IO completion port work could be better
fixes #339 Windows iocp could use synchronous completions
fixes #280 TCP abstraction improvements
This is a rather monstrous set of changes, which refactors TCP, and
the underlying Windows I/O completion path logic, in order to obtain
a cleaner, simpler API, with support for asynchronous DNS lookups performed
on connect rather than initialization time, the ability to have multiple
connects or accepts pending, as well as fewer extraneous function calls.
The Windows code also benefits from greatly reduced context switching,
fewer lock operations performed, and a reduced number of system calls
on the hot code path. (We use automatic event resetting instead of manual.)
Some dead code was removed as well, and a few potential edge case leaks
on failure paths (in the websocket code) were plugged.
Note that all TCP based transports benefit from this work. The IPC code
on Windows still uses the legacy IOCP for now, as does the UDP code (used
for ZeroTier.) We will be converting those soon too.
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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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This uses id lookups for pipe listener and dialer during pipe getopt,
while still retaining the pointer fields for use during tear down.
More changes coming.
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This sets the kqueue events to autoclear, reducing CPU usage to normal
sane levels, and eliminating the hard spin.
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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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a missing return causes ipc and inproc URLs to be parsed as usual. Results in a memory leak.
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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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fixes #538 setopt should have an explicit chkopt routine
fixes #537 Internal TCP API needs better name separation
fixes #524 Option types should be "typed"
This is a rework of the option management code, to make it both clearer
and to prepare for further work to break up endpoints. This reduces
a certain amount of dead or redundant code, and actually saves cycles
when setting options, as some loops were not terminated that should have
been.
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This changes nni_aio_begin so that it immediately terminates when
it encounters aio->a_closed, much like it does for aio->a_stop.
The semantic for nni_aio_close() is supposed to be like nni_aio_stop(),
but without blocking.
I suspect that this might be responsible for use-after-free bugs that
seem to have been rearing their head lately.
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This should work on both Windows and the most common POSIX
variants. We will create at least two threads for running
completions, but there are numerous other threads in the code.
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Essentially, if we're destroying an aio, and we are doing so from the
thread that is running the callback, then we should defer the destruction
of the task until it returns.
Note that calling nni_aio_wait() or anything else that calls it from
the callback is still verboten and will result in a single party
deadlock.
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This special cases the URL parser for inproc and IPC urls,
changing so that they no longer parse the thing after the ://
as anything special. This allows IPC URLs to be relative.
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This enables the software to be built for Android, going back to
at least Android SDK r15 (IceCreamSandwich) and at least up to
SDK r27 (Oreo). Older versions of Android may work, but we have
no way to build them to test.
While here we have changed our CMake configuration to disable
building tools or tests when we detect a cross-compile situation.
Documentation for cross-compilation is updated as well.
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fixes #490 posix_epdesc use-after-free bug
fixes #489 Sanitizer based testing would help
fixes #492 Numerous memory leaks found with sanitizer
This introduces support for compiler-based sanitizers when using
clang or gcc (and not on Windows). See NNG_SANITIZER for possible
settings such as "thread" or "address".
Furthermore, we have fixed the issues we found with both the
thread and address sanitizers. We believe that the thread issues
pointed to a low frequency use-after-free responsible for rare
crashes in some of the tests.
The tests generally have their timeouts doubled when running under
a sanitizer, to account for the extra long times that the sanitizer
can cause these to take.
While here, we also changed the compat_ws test to avoid a particularly
painful and time consuming DNS lookup, and we made the nngcat_unlimited
test a bit more robust by waiting before sending traffic.
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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 #485 Honor BUILD_SHARED_LIBS
fixes #483 Don't expose private symbols in shared library
fixes #481 Export CMake target
This is a "large" commit involving changes that don't affect the
code directly, but which have an impact on how we package and build
our project.
The most significant of these changes is that we now build only
either a shared or a static library, depending on the setting of
the BUILD_SHARED_LIBS option. We also suppress private symbols
from being exposed when the underlying toolchain lets us do so.
Minor updates to the way we version the ABI are used, and we now
have a nice exported CMake project.
To import this project in another, simply do find_package(nng)
and you can add target_link_libraries(nng::nng) to your targets.
CMake does the rest for you.
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