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This commit applies rustfmt with rust-lang/rust's default settings to
files in src/libstd/sys *that are not involved in any currently open PR*
to minimize merge conflicts. THe list of files involved in open PRs was
determined by querying GitHub's GraphQL API with this script:
https://gist.github.com/dtolnay/aa9c34993dc051a4f344d1b10e4487e8
With the list of files from the script in outstanding_files, the
relevant commands were:
$ find src/libstd/sys -name '*.rs' \
| xargs rustfmt --edition=2018 --unstable-features --skip-children
$ rg libstd/sys outstanding_files | xargs git checkout --
Repeating this process several months apart should get us coverage of
most of the rest of the files.
To confirm no funny business:
$ git checkout $THIS_COMMIT^
$ git show --pretty= --name-only $THIS_COMMIT \
| xargs rustfmt --edition=2018 --unstable-features --skip-children
$ git diff $THIS_COMMIT # there should be no difference
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This commit is the result of the FCPs ending for the 1.8 release cycle for both
the libs and the lang suteams. The full list of changes are:
Stabilized
* `braced_empty_structs`
* `augmented_assignments`
* `str::encode_utf16` - renamed from `utf16_units`
* `str::EncodeUtf16` - renamed from `Utf16Units`
* `Ref::map`
* `RefMut::map`
* `ptr::drop_in_place`
* `time::Instant`
* `time::SystemTime`
* `{Instant,SystemTime}::now`
* `{Instant,SystemTime}::duration_since` - renamed from `duration_from_earlier`
* `{Instant,SystemTime}::elapsed`
* Various `Add`/`Sub` impls for `Time` and `SystemTime`
* `SystemTimeError`
* `SystemTimeError::duration`
* Various impls for `SystemTimeError`
* `UNIX_EPOCH`
* `ops::{Add,Sub,Mul,Div,Rem,BitAnd,BitOr,BitXor,Shl,Shr}Assign`
Deprecated
* Scoped TLS (the `scoped_thread_local!` macro)
* `Ref::filter_map`
* `RefMut::filter_map`
* `RwLockReadGuard::map`
* `RwLockWriteGuard::map`
* `Condvar::wait_timeout_with`
Closes #27714
Closes #27715
Closes #27746
Closes #27748
Closes #27908
Closes #29866
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* Delete `sys::unix::{c, sync}` as these are now all folded into libc itself
* Update all references to use `libc` as a result.
* Update all references to the new flat namespace.
* Moves all windows bindings into sys::c
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This commit enables executables linked against the standard library to run on
Windows XP. There are two main components of this commit:
* APIs not available on XP are shimmed to have a fallback implementation and use
runtime detection to determine if they are available.
* Mutexes on Windows were reimplemented to use critical sections on XP where
rwlocks are not available.
The APIs which are not available on XP are:
* SetFileInformationByHandle - this is just used by `File::truncate` and that
function just returns an error now.
* SetThreadStackGuarantee - this is used by the stack overflow support on
windows, but if this isn't available then it's just ignored (it seems
non-critical).
* All condition variable APIs are missing - the shims added for these apis
simply always panic for now. We may eventually provide a fallback
implementation, but for now the standard library does not rely on condition
variables for normal use.
* RWLocks, like condition variables, are missing entirely. The same story for
condition variables is taken here. These APIs are all now panicking stubs as
the standard library doesn't rely on RWLocks for normal use.
Currently, as an optimization, we use SRWLOCKs for the standard `sync::Mutex`
implementation on Windows, which is indeed required for normal operation of the
standard library. To allow the standard library to run on XP, this commit
reimplements mutexes on Windows to use SRWLOCK instances *if available* and
otherwise a CriticalSection is used (with some checking for recursive
locking).
With all these changes put together, a 32-bit MSVC-built executable can run on
Windows XP and print "hello world"
Closes #12842
Closes #19992
Closes #24776
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