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Fixes #3308
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m_holder.compare_exchange_strong(expected, desired, ...)
will either successfully update the value to desired if == expected
or put the current value in expected otherwise.
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LibPThread: mark pthread_exit a noreturn function using compiler attributes
LibThread: remove a call to pthread_exit from Thread::start lambda expression
as it make the return of teh lambda unreachable.
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Closes https://github.com/SerenityOS/serenity/issues/2080
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It's tedious to write (and look at) [[gnu::always_inline]] etc. :^)
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Instead of using a separate synchronization variable, just use the lock
holder TID for synchronization. This way, we only need to CAS when
first acquiring a lock.
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In the old model, before bc319d9e8873734bb8e8cea3d762d7fab2ded887, the parent
(the background thread) would delete us when it exits (i.e. never), so we had to
keep track of our own refcount in order to destroy ourselves when we're done.
With bc319d9e8873734bb8e8cea3d762d7fab2ded887, the parent keeps additional
reference to us, so:
* There should be no need to explicitly ref() ourselves
* The unref() would not get rid of the last reference to us anymore
The latter is why all the BackgroundAction's were getting leaked. Fix this by
simply unparenting ourselves from the background thread when we're done.
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FilePicker was not showing thumbnails correctly because once each
thumbnail rendering BackgroundAction completed, it posted a deferred
invocation event to the *main* event loop.
Since FilePicker runs in a nested event loop, those completion
callbacks never ran until it was too late and the FilePicker was gone.
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This patch adds <LibCore/Forward.h> and uses it in various places to
shrink the header dependency graph.
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Serenity calls pthread_self() for gettid() anyway but this makes it
portable.
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I've been wanting to do this for a long time. It's time we start being
consistent about how this stuff works.
The new convention is:
- "LibFoo" is a userspace library that provides the "Foo" namespace.
That's it :^) This was pretty tedious to convert and I didn't even
start on LibGUI yet. But it's coming up next.
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This changes copyright holder to myself for the source code files that I've
created or have (almost) completely rewritten. Not included are the files
that were significantly changed by others even though it was me who originally
created them (think HtmlView), or the many other files I've contributed code to.
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It always bothered me that we're using the overloaded "dereference"
term for this. Let's call it "unreference" instead. :^)
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As suggested by Joshua, this commit adds the 2-clause BSD license as a
comment block to the top of every source file.
For the first pass, I've just added myself for simplicity. I encourage
everyone to add themselves as copyright holders of any file they've
added or modified in some significant way. If I've added myself in
error somewhere, feel free to replace it with the appropriate copyright
holder instead.
Going forward, all new source files should include a license header.
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Other implementations of pthread_setname_np() do not take the name
length as an argument.
For pthread_getname_np(), other implementations take the buffer size
as a size_t.
This patch brings us in line with other implementations.
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Allow everything to be built from the top level directory with just
'make', cleaned with 'make clean', and installed with 'make
install'. Also support these in any particular subdirectory.
Specifying 'make VERBOSE=1' will print each ld/g++/etc. command as
it runs.
Kernel and early host tools (IPCCompiler, etc.) are built as
object.host.o so that they don't conflict with other things built
with the cross-compiler.
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Thread now has an optional thread_name parameter to the consturctor
that will call pthread_setname_np if given.
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This patch adds pthread_create() and pthread_exit(), which currently
simply wrap our existing create_thread() and exit_thread() syscalls.
LibThread is also ported to using LibPthread.
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Ports/.port_include.sh, Toolchain/BuildIt.sh, Toolchain/UseIt.sh
have been left largely untouched due to use of Bash-exclusive
functions and variables such as $BASH_SOURCE, pushd and popd.
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Use gcc built-in atomics
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Okay, I've spent a whole day on this now, and it finally kinda works!
With this patch, CObject and all of its derived classes are reference
counted instead of tree-owned.
The previous, Qt-like model was nice and familiar, but ultimately also
outdated and difficult to reason about.
CObject-derived types should now be stored in RefPtr/NonnullRefPtr and
each class can be constructed using the forwarding construct() helper:
auto widget = GWidget::construct(parent_widget);
Note that construct() simply forwards all arguments to an existing
constructor. It is inserted into each class by the C_OBJECT macro,
see CObject.h to understand how that works.
CObject::delete_later() disappears in this patch, as there is no longer
a single logical owner of a CObject.
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This unbreaks the SDL port build.
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And adapt all the code that uses it.
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This library is meant to provide C++-style wrappers over lower
level APIs such as syscalls and pthread_* functions, as well as
utilities for easily running pieces of logic on different
threads.
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