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Implement FreeBSD syscall _umtx_op for futex support
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Futex support
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This is necessary to unblock rust-lang/rust#122408. The documentation for these is available [here](https://developer.apple.com/documentation/os/os_sync_wait_on_address?language=objc).
Because the futex wait operations (`os_sync_wait_on_address` et al.) return the number of remaining waiters after returning, this required some changes to the common futex infrastructure, which I've changed to take a callback instead of precalculating the return values.
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implicitly unlocked
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Disallow hidden references to mutable static
Closes #123060
Tracking:
- https://github.com/rust-lang/rust/issues/123758
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Follow-up on #3833 and #3835. In these PRs, the TB GC was fixed to no
longer cause a stack overflow. One test that motivated it was the test
`fill::horizontal_line` in `tiny_skia`. But not causing stack overflows
was not a large improvents, since it did not fix the fundamental issue:
The tree was too large. The test now ran, but it required gigabytes of
memory and hours of time, whereas it finishes within seconds in Stacked
Borrows.
The problem in that test was that it used [`slice::chunked`](https://doc.rust-lang.org/std/primitive.slice.html#method.chunks) to iterate
a slice in chunks. That iterator is written to reborrow at each call to
`next`, which creates a linear tree with a bunch of intermediary nodes,
which also fragments the `RangeMap` for that allocation.
The solution is to now compact the tree, so that these interior nodes
are removed. Care is taken to not remove nodes that are protected, or
that otherwise restrict their children.
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As discovered by Mara in #110897, our TLS implementation is a total mess. In the past months, I have simplified the actual macros and their expansions, but the majority of the complexity comes from the platform-specific support code needed to create keys and register destructors. In keeping with #117276, I have therefore moved all of the `thread_local_key`/`thread_local_dtor` modules to the `thread_local` module in `sys` and merged them into a new structure, so that future porters of `std` can simply mix-and-match the existing code instead of having to copy the same (bad) implementation everywhere. The new structure should become obvious when looking at `sys/thread_local/mod.rs`.
Unfortunately, the documentation changes associated with the refactoring have made this PR rather large. That said, this contains no functional changes except for two small ones:
* the key-based destructor fallback now, by virtue of sharing the implementation used by macOS and others, stores its list in a `#[thread_local]` static instead of in the key, eliminating one indirection layer and drastically simplifying its code.
* I've switched over ZKVM (tier 3) to use the same implementation as WebAssembly, as the implementation was just a way worse version of that
Please let me know if I can make this easier to review! I know these large PRs aren't optimal, but I couldn't think of any good intermediate steps.
@rustbot label +A-thread-locals
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Since https://github.com/rust-lang/rust/pull/121956 we don't need it any more,
and we are generally short on Windows staff so reducing the amount of code we
have to test and maintain sounds like a good idea.
The InitOnce stuff is still used by `thread_local_key::StaticKey`.
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* additional
* addresses
* aggregates
* always
* around
* beginning
* behaviours
* borrows
* called
* canary
* deallocated
* determine
* division
* documentation
* empty
* endianness
* ensures
* existing
* github
* hygiene
* individual
* initialize
* instantiate
* library
* location
* miscellaneous
* mitigates
* needs
* nonexistent
* occurred
* occurring
* overridden
* parameter
* performable
* previous
* referential
* requires
* resolved
* scenarios
* semantics
* spurious
* structure
* subtracting
* suppress
* synchronization
* this
* timestamp
* to
* transferring
* unknown
* variable
* windows
Signed-off-by: Josh Soref <2119212+jsoref@users.noreply.github.com>
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git-subtree-dir: src/tools/miri
git-subtree-mainline: 3f3167fb59341ac3240ca1774f48e8c053219131
git-subtree-split: 75dd959a3a40eb5b4574f8d2e23aa6efbeb33573
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