The FSEvents APIs are available on iOS6+: however, the DirectoryWatcher
code isn't wired up to really use FSEvents on embedded platforms.
I've duplicated code from DirectoryWatcher-not-implemented.cpp here and
used TargetConditionals instead of adding cmakery to check try_compile;
I couldn't get that to work properly.
I observed two bugs in the DirectoryWatcher on macOS
1. We were calling FSEventStreamStop and FSEventStreamInvalidate before
we called FSEventStreamStart and FSEventStreamSetDispatchQueue, if the
DirectoryWatcher was destroyed before the initial async work was done.
This violates the requirements of the FSEvents API.
2. Calls to Receiver could race between the initial work and the
invalidation during destruction.
The second issue is easier to see when using TSan.
Differential Revision: https://reviews.llvm.org/D74371
rdar://59215667
Now that we've moved to C++14, we no longer need the llvm::make_unique
implementation from STLExtras.h. This patch is a mechanical replacement
of (hopefully) all the llvm::make_unique instances across the monorepo.
Differential revision: https://reviews.llvm.org/D66259
llvm-svn: 368942
r367979 changed DirectoryWatcher::Create to return an llvm::Expected.
Adjust the Windows stub accordingly.
(upstreamed from github.com/apple/swift-clang)
llvm-svn: 368762
This is just a code skeleton for DirectoryWatcher-windows.cpp so the
build on Windows stops breaking.
(upstreamed from github.com/apple/swift-clang)
llvm-svn: 368761
I also have replaced all the instances of
"auto DW = DirectoryWatcher::create" with
llvm::Expected<std::unique_ptr<DirectoryWatcher>> DW = DirectoryWatcher::create
to make it more clear that DirectoryWatcher::create is returning an Expected.
I've also allowed for logAllUnhandledErrors to consume errors in the case were
DirectoryWatcher::create produces them.
Differential Revision: https://reviews.llvm.org/D65829
llvm-svn: 368108
Add a missing semicolon after an assert. Remove the period from the
assert message while I'm here, because we don't usually have those.
llvm-svn: 367984
Prior to this patch Unix style errno error reporting from the inotify layer was
used by DirectoryWatcher::create to simply return a nullptr on error. This
would generally be ok, except that in LLVM we have much more robust error
reporting through the facilities of llvm::Expected.
The other critical thing I stumbled across was that the unit tests for
DirectoryWatcher were not failing abruptly when inotify_init() was reporting an
error, but would continue with the testing and eventually hit a deadlock in a
pathological machine state (ie in the unit test, the return nullptr on ::create
was ignored).
Generally this pathological state never happens on any build bot, so it is
totally understandable that it was overlooked, but on a Linux desktop running
a dubious desktop environment (which I will not name) there is a chance that
said desktop environment could use up enough inotify instances to exceed the
user's limit. These are the conditions that led me to hit the deadlock I am
addressing in this patch with more robust error handling.
With the new llvm::Expected error handling when your system runs out of inotify
instances for your user, the unit test will be forced to handle the error or
crash and report the issue to the user instead of weirdly deadlocking on a
condition variable wait.
Differential Revision: https://reviews.llvm.org/D65704
llvm-svn: 367979
Apparently kernel support for IN_EXCL_UNLINK in inotify_add_watch() doesn't imply it's defined in sys/inotify.h.
https://bugs.llvm.org/show_bug.cgi?id=42824
llvm-svn: 367906
As discussed in D65249, don't use AlignedCharArray or std::aligned_storage. Just use alignas(X) char Buf[Size];. This will allow me to remove AlignedCharArray entirely, and works on the current minimum version of Visual Studio.
llvm-svn: 367274
This reverts commit f561227d13.
- DirectoryWatcher
- Fix the build for platforms that don't have DW implementated.
- Fix the threading dependencies (thanks to compnerd).
llvm-svn: 365954
Asynchronously monitors specified directory for changes and passes notifications to provided callback.
Dependency for index-while-building.
Differential Revision: https://reviews.llvm.org/D58418
llvm-svn: 365574
Vedant Kumar