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Use gcc built-in atomics
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It's so big and chunky anyway, it's silly to expand it everywhere.
This makes it a lot easier to read function disassembly dumps.
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These types can be picked up by including <AK/Types.h>:
* u8, u16, u32, u64 (unsigned)
* i8, i16, i32, i64 (signed)
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There's a ton of work that would need to be done before we could spin up on
another architecture, but let's at least try to separate things out a bit.
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Also run it across the whole tree to get everything using the One True Style.
We don't yet run this in an automated fashion as it's a little slow, but
there is a snippet to do so in makeall.sh.
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It makes no sense that clients had to worry about whether or not KSyms
were loaded.
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Since we're not interested in taking the lock if it's already held,
there's no need to donate the remainder of our time slice to the holder.
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We can't have multiple threads in the same process running in the kernel
at the same time, so let's have a per-process lock that threads have to
acquire on syscall entry/exit (and yield while blocked.)
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The scheduler now operates on threads, rather than on processes.
Each process has a main thread, and can have any number of additional
threads. The process exits when the main thread exits.
This patch doesn't actually spawn any additional threads, it merely
does all the plumbing needed to make it possible. :^)
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