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Don't round stack size up for created threads in Windows
Fixes #94454
Windows does the rounding itself, so there isn't a need to explicity do the rounding beforehand, as mentioned by ```@ChrisDenton``` in #94454
> The operating system rounds up the specified size to the nearest multiple of the system's allocation granularity (typically 64 KB). To retrieve the allocation granularity of the current system, use the [GetSystemInfo](https://docs.microsoft.com/en-us/windows/win32/api/sysinfoapi/nf-sysinfoapi-getsysteminfo) function.
https://docs.microsoft.com/en-us/windows/win32/procthread/thread-stack-size
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Use the new `HandleOrNull` and `HandleOrInvalid` types that were introduced
as part of [I/O safety] in a few functions in the Windows FFI bindings.
This factors out an `unsafe` block and two `unsafe` function calls in the
Windows implementation code.
And, it helps test `HandleOrNull` and `HandleOrInvalid`, which indeed turned
up a bug: `OwnedHandle` also needs to be `#[repr(transparent)]`, as it's
used inside of `HandleOrNull` and `HandleOrInvalid` which are also
`#[repr(transparent)]`.
[I/O safety]: https://github.com/rust-lang/rust/issues/87074
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`std::thread::available_parallelism`
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Introduce `OwnedFd` and `BorrowedFd`, and the `AsFd` trait, and
implementations of `AsFd`, `From<OwnedFd>` and `From<T> for OwnedFd`
for relevant types, along with Windows counterparts for handles and
sockets.
Tracking issue:
- <https://github.com/rust-lang/rust/issues/87074>
RFC:
- <https://github.com/rust-lang/rfcs/blob/master/text/3128-io-safety.md>
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