Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

19 files changed, 740 insertions, 0 deletions

diff --git a/vendor/fd-lock/src/lib.rs b/vendor/fd-lock/src/lib.rs
new file mode 100644
index 000000000..9d3d6192b
--- /dev/null
+++ b/vendor/fd-lock/src/lib.rs
@@ -0,0 +1,43 @@
+//! Advisory reader-writer locks for files.
+//!
+//! # Notes on Advisory Locks
+//!
+//! "advisory locks" are locks which programs must opt-in to adhere to. This
+//! means that they can be used to coordinate file access, but not prevent
+//! access. Use this to coordinate file access between multiple instances of the
+//! same program. But do not use this to prevent actors from accessing or
+//! modifying files.
+//!
+//! # Example
+//!
+//! ```no_run
+//! # use std::io;
+//! use std::io::prelude::*;
+//! use std::fs::File;
+//! use fd_lock::RwLock;
+//!
+//! # fn main() -> io::Result<()> {
+//! // Lock a file and write to it.
+//! let mut f = RwLock::new(File::open("foo.txt")?);
+//! write!(f.write()?, "chashu cat")?;
+//!
+//! // A lock can also be held across multiple operations.
+//! let mut f = f.write()?;
+//! write!(f, "nori cat")?;
+//! write!(f, "bird!")?;
+//! # Ok(()) }
+//! ```
+
+#![forbid(future_incompatible)]
+#![deny(missing_debug_implementations, nonstandard_style)]
+#![cfg_attr(doc, warn(missing_docs, rustdoc::missing_doc_code_examples))]
+
+mod read_guard;
+mod rw_lock;
+mod write_guard;
+
+pub(crate) mod sys;
+
+pub use read_guard::RwLockReadGuard;
+pub use rw_lock::RwLock;
+pub use write_guard::RwLockWriteGuard;
diff --git a/vendor/fd-lock/src/read_guard.rs b/vendor/fd-lock/src/read_guard.rs
new file mode 100644
index 000000000..29ed06da3
--- /dev/null
+++ b/vendor/fd-lock/src/read_guard.rs
@@ -0,0 +1,43 @@
+use std::ops;
+
+use crate::sys;
+
+/// RAII structure used to release the shared read access of a lock when
+/// dropped.
+///
+/// This structure is created by the [`read`] and [`try_read`] methods on
+/// [`RwLock`].
+///
+/// [`read`]: crate::RwLock::read
+/// [`try_read`]: crate::RwLock::try_read
+/// [`RwLock`]: crate::RwLock
+///
+/// # Panics
+///
+/// Dropping this type may panic if the lock fails to unlock.
+#[must_use = "if unused the RwLock will immediately unlock"]
+#[derive(Debug)]
+pub struct RwLockReadGuard<'lock, T: sys::AsRaw> {
+    guard: sys::RwLockReadGuard<'lock, T>,
+}
+
+impl<'lock, T: sys::AsRaw> RwLockReadGuard<'lock, T> {
+    pub(crate) fn new(guard: sys::RwLockReadGuard<'lock, T>) -> Self {
+        Self { guard }
+    }
+}
+
+impl<T: sys::AsRaw> ops::Deref for RwLockReadGuard<'_, T> {
+    type Target = T;
+
+    #[inline]
+    fn deref(&self) -> &Self::Target {
+        self.guard.deref()
+    }
+}
+
+/// Release the lock.
+impl<T: sys::AsRaw> Drop for RwLockReadGuard<'_, T> {
+    #[inline]
+    fn drop(&mut self) {}
+}
diff --git a/vendor/fd-lock/src/rw_lock.rs b/vendor/fd-lock/src/rw_lock.rs
new file mode 100644
index 000000000..77f9d2231
--- /dev/null
+++ b/vendor/fd-lock/src/rw_lock.rs
@@ -0,0 +1,126 @@
+use crate::read_guard::RwLockReadGuard;
+use crate::sys;
+use crate::write_guard::RwLockWriteGuard;
+use std::io;
+
+/// Advisory reader-writer lock for files.
+///
+/// This type of lock allows a number of readers or at most one writer at any point
+/// in time. The write portion of this lock typically allows modification of the
+/// underlying data (exclusive access) and the read portion of this lock typically
+/// allows for read-only access (shared access).
+#[derive(Debug)]
+pub struct RwLock<T: sys::AsRaw> {
+    lock: sys::RwLock<T>,
+}
+
+impl<T: sys::AsRaw> RwLock<T> {
+    /// Create a new instance.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use fd_lock::RwLock;
+    /// use std::fs::File;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let mut f = RwLock::new(File::open("foo.txt")?);
+    ///     Ok(())
+    /// }
+    /// ```
+    #[inline]
+    pub fn new(inner: T) -> Self {
+        Self {
+            lock: sys::RwLock::new(inner),
+        }
+    }
+
+    /// Locks this lock with shared read access, blocking the current thread
+    /// until it can be acquired.
+    ///
+    /// The calling thread will be blocked until there are no more writers which
+    /// hold the lock. There may be other readers currently inside the lock when
+    /// this method returns. This method does not provide any guarantees with
+    /// respect to the ordering of whether contentious readers or writers will
+    /// acquire the lock first.
+    ///
+    /// Returns an RAII guard which will release this thread's shared access
+    /// once it is dropped.
+    ///
+    /// # Errors
+    ///
+    /// On Unix this may return an `ErrorKind::Interrupted` if the operation was
+    /// interrupted by a signal handler.
+    #[inline]
+    pub fn read(&self) -> io::Result<RwLockReadGuard<'_, T>> {
+        let guard = self.lock.read()?;
+        Ok(RwLockReadGuard::new(guard))
+    }
+
+    /// Attempts to acquire this lock with shared read access.
+    ///
+    /// If the access could not be granted at this time, then `Err` is returned.
+    /// Otherwise, an RAII guard is returned which will release the shared access
+    /// when it is dropped.
+    ///
+    /// This function does not block.
+    ///
+    /// This function does not provide any guarantees with respect to the ordering
+    /// of whether contentious readers or writers will acquire the lock first.
+    ///
+    /// # Errors
+    ///
+    /// If the lock is already held and `ErrorKind::WouldBlock` error is returned.
+    /// On Unix this may return an `ErrorKind::Interrupted` if the operation was
+    /// interrupted by a signal handler.
+    #[inline]
+    pub fn try_read(&self) -> io::Result<RwLockReadGuard<'_, T>> {
+        let guard = self.lock.try_read()?;
+        Ok(RwLockReadGuard::new(guard))
+    }
+
+    /// Locks this lock with exclusive write access, blocking the current thread
+    /// until it can be acquired.
+    ///
+    /// This function will not return while other writers or other readers
+    /// currently have access to the lock.
+    ///
+    /// Returns an RAII guard which will drop the write access of this rwlock
+    /// when dropped.
+    ///
+    /// # Errors
+    ///
+    /// On Unix this may return an `ErrorKind::Interrupted` if the operation was
+    /// interrupted by a signal handler.
+    #[inline]
+    pub fn write(&mut self) -> io::Result<RwLockWriteGuard<'_, T>> {
+        let guard = self.lock.write()?;
+        Ok(RwLockWriteGuard::new(guard))
+    }
+
+    /// Attempts to lock this lock with exclusive write access.
+    ///
+    /// If the lock could not be acquired at this time, then `Err` is returned.
+    /// Otherwise, an RAII guard is returned which will release the lock when
+    /// it is dropped.
+    ///
+    /// # Errors
+    ///
+    /// If the lock is already held and `ErrorKind::WouldBlock` error is returned.
+    /// On Unix this may return an `ErrorKind::Interrupted` if the operation was
+    /// interrupted by a signal handler.
+    #[inline]
+    pub fn try_write(&mut self) -> io::Result<RwLockWriteGuard<'_, T>> {
+        let guard = self.lock.try_write()?;
+        Ok(RwLockWriteGuard::new(guard))
+    }
+
+    /// Consumes this `RwLock`, returning the underlying data.
+    #[inline]
+    pub fn into_inner(self) -> T
+    where
+        T: Sized,
+    {
+        self.lock.into_inner()
+    }
+}
diff --git a/vendor/fd-lock/src/sys/mod.rs b/vendor/fd-lock/src/sys/mod.rs
new file mode 100644
index 000000000..3c6391e98
--- /dev/null
+++ b/vendor/fd-lock/src/sys/mod.rs
@@ -0,0 +1,17 @@
+use cfg_if::cfg_if;
+
+cfg_if! {
+    if #[cfg(unix)] {
+        mod unix;
+        pub use unix::*;
+        pub(crate) use std::os::unix::prelude::AsRawFd as AsRaw;
+    } else if #[cfg(windows)] {
+        mod windows;
+        pub use windows::*;
+        #[doc(no_inline)]
+        pub(crate) use std::os::windows::prelude::AsRawHandle as AsRaw;
+    } else {
+        mod unsupported;
+        pub use unsupported;
+    }
+}
diff --git a/vendor/fd-lock/src/sys/unix/mod.rs b/vendor/fd-lock/src/sys/unix/mod.rs
new file mode 100644
index 000000000..023e69187
--- /dev/null
+++ b/vendor/fd-lock/src/sys/unix/mod.rs
@@ -0,0 +1,7 @@
+mod read_guard;
+mod rw_lock;
+mod write_guard;
+
+pub use read_guard::RwLockReadGuard;
+pub use rw_lock::RwLock;
+pub use write_guard::RwLockWriteGuard;
diff --git a/vendor/fd-lock/src/sys/unix/read_guard.rs b/vendor/fd-lock/src/sys/unix/read_guard.rs
new file mode 100644
index 000000000..6d6718789
--- /dev/null
+++ b/vendor/fd-lock/src/sys/unix/read_guard.rs
@@ -0,0 +1,32 @@
+use rustix::fs::{flock, FlockOperation};
+use std::ops;
+use std::os::unix::io::AsRawFd;
+
+use super::RwLock;
+
+#[derive(Debug)]
+pub struct RwLockReadGuard<'lock, T: AsRawFd> {
+    lock: &'lock RwLock<T>,
+}
+
+impl<'lock, T: AsRawFd> RwLockReadGuard<'lock, T> {
+    pub(crate) fn new(lock: &'lock RwLock<T>) -> Self {
+        Self { lock }
+    }
+}
+
+impl<T: AsRawFd> ops::Deref for RwLockReadGuard<'_, T> {
+    type Target = T;
+
+    #[inline]
+    fn deref(&self) -> &Self::Target {
+        &self.lock.inner
+    }
+}
+
+impl<T: AsRawFd> Drop for RwLockReadGuard<'_, T> {
+    #[inline]
+    fn drop(&mut self) {
+        let _ = flock(&self.lock.as_fd(), FlockOperation::Unlock).ok();
+    }
+}
diff --git a/vendor/fd-lock/src/sys/unix/rw_lock.rs b/vendor/fd-lock/src/sys/unix/rw_lock.rs
new file mode 100644
index 000000000..c33ce5c78
--- /dev/null
+++ b/vendor/fd-lock/src/sys/unix/rw_lock.rs
@@ -0,0 +1,70 @@
+use rustix::fd::BorrowedFd;
+use rustix::fs::{flock, FlockOperation};
+use std::io::{self, Error, ErrorKind};
+use std::os::unix::io::AsRawFd;
+
+use super::{RwLockReadGuard, RwLockWriteGuard};
+
+#[derive(Debug)]
+pub struct RwLock<T: AsRawFd> {
+    pub(crate) inner: T,
+}
+
+impl<T: AsRawFd> RwLock<T> {
+    #[inline]
+    pub fn new(inner: T) -> Self {
+        RwLock { inner }
+    }
+
+    #[inline]
+    pub fn write(&mut self) -> io::Result<RwLockWriteGuard<'_, T>> {
+        flock(&self.as_fd(), FlockOperation::LockExclusive)?;
+        Ok(RwLockWriteGuard::new(self))
+    }
+
+    #[inline]
+    pub fn try_write(&mut self) -> Result<RwLockWriteGuard<'_, T>, Error> {
+        flock(&self.as_fd(), FlockOperation::NonBlockingLockExclusive).map_err(|err| match err
+            .kind()
+        {
+            ErrorKind::AlreadyExists => ErrorKind::WouldBlock.into(),
+            _ => Error::from(err),
+        })?;
+        Ok(RwLockWriteGuard::new(self))
+    }
+
+    #[inline]
+    pub fn read(&self) -> io::Result<RwLockReadGuard<'_, T>> {
+        flock(&self.as_fd(), FlockOperation::LockShared)?;
+        Ok(RwLockReadGuard::new(self))
+    }
+
+    #[inline]
+    pub fn try_read(&self) -> Result<RwLockReadGuard<'_, T>, Error> {
+        flock(&self.as_fd(), FlockOperation::NonBlockingLockShared).map_err(|err| {
+            match err.kind() {
+                ErrorKind::AlreadyExists => ErrorKind::WouldBlock.into(),
+                _ => Error::from(err),
+            }
+        })?;
+        Ok(RwLockReadGuard::new(self))
+    }
+
+    #[inline]
+    pub fn into_inner(self) -> T
+    where
+        T: Sized,
+    {
+        self.inner
+    }
+
+    #[inline]
+    pub(crate) fn as_fd(&self) -> BorrowedFd<'_> {
+        // Safety: We assume that `self.inner`'s file descriptor is valid for
+        // at least the lifetime of `self`.
+        //
+        // Once I/O safety is stablized in std, we can switch the public API to
+        // use `AsFd` instead of `AsRawFd` and eliminate this `unsafe` block.
+        unsafe { BorrowedFd::borrow_raw(self.inner.as_raw_fd()) }
+    }
+}
diff --git a/vendor/fd-lock/src/sys/unix/write_guard.rs b/vendor/fd-lock/src/sys/unix/write_guard.rs
new file mode 100644
index 000000000..a12bdf97a
--- /dev/null
+++ b/vendor/fd-lock/src/sys/unix/write_guard.rs
@@ -0,0 +1,39 @@
+use rustix::fs::{flock, FlockOperation};
+use std::ops;
+use std::os::unix::io::AsRawFd;
+
+use super::RwLock;
+
+#[derive(Debug)]
+pub struct RwLockWriteGuard<'lock, T: AsRawFd> {
+    lock: &'lock mut RwLock<T>,
+}
+
+impl<'lock, T: AsRawFd> RwLockWriteGuard<'lock, T> {
+    pub(crate) fn new(lock: &'lock mut RwLock<T>) -> Self {
+        Self { lock }
+    }
+}
+
+impl<T: AsRawFd> ops::Deref for RwLockWriteGuard<'_, T> {
+    type Target = T;
+
+    #[inline]
+    fn deref(&self) -> &Self::Target {
+        &self.lock.inner
+    }
+}
+
+impl<T: AsRawFd> ops::DerefMut for RwLockWriteGuard<'_, T> {
+    #[inline]
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.lock.inner
+    }
+}
+
+impl<T: AsRawFd> Drop for RwLockWriteGuard<'_, T> {
+    #[inline]
+    fn drop(&mut self) {
+        let _ = flock(&self.lock.as_fd(), FlockOperation::Unlock).ok();
+    }
+}
diff --git a/vendor/fd-lock/src/sys/unsupported/mod.rs b/vendor/fd-lock/src/sys/unsupported/mod.rs
new file mode 100644
index 000000000..9d7bd2cbd
--- /dev/null
+++ b/vendor/fd-lock/src/sys/unsupported/mod.rs
@@ -0,0 +1,9 @@
+mod read_guard;
+mod rw_lock;
+mod write_guard;
+
+pub(crate) mod utils;
+
+pub use read_guard::RwLockReadGuard;
+pub use rw_lock::RwLock;
+pub use write_guard::RwLockWriteGuard;
diff --git a/vendor/fd-lock/src/sys/unsupported/read_guard.rs b/vendor/fd-lock/src/sys/unsupported/read_guard.rs
new file mode 100644
index 000000000..7d6b4c783
--- /dev/null
+++ b/vendor/fd-lock/src/sys/unsupported/read_guard.rs
@@ -0,0 +1,31 @@
+use std::ops;
+use std::os::unix::io::AsRawFd;
+
+use super::RwLock;
+
+#[derive(Debug)]
+pub struct RwLockReadGuard<'lock, T: AsRawFd> {
+    lock: &'lock RwLock<T>,
+}
+
+impl<'lock, T: AsRawFd> RwLockReadGuard<'lock, T> {
+    pub(crate) fn new(lock: &'lock RwLock<T>) -> Self {
+        panic!("target unsupported")
+    }
+}
+
+impl<T: AsRawFd> ops::Deref for RwLockReadGuard<'_, T> {
+    type Target = T;
+
+    #[inline]
+    fn deref(&self) -> &Self::Target {
+        panic!("target unsupported")
+    }
+}
+
+impl<T: AsRawFd> Drop for RwLockReadGuard<'_, T> {
+    #[inline]
+    fn drop(&mut self) {
+        panic!("target unsupported")
+    }
+}
diff --git a/vendor/fd-lock/src/sys/unsupported/rw_lock.rs b/vendor/fd-lock/src/sys/unsupported/rw_lock.rs
new file mode 100644
index 000000000..fb11da84b
--- /dev/null
+++ b/vendor/fd-lock/src/sys/unsupported/rw_lock.rs
@@ -0,0 +1,44 @@
+use std::io::{self, Error, ErrorKind};
+use std::os::unix::io::AsRawFd;
+
+use super::{RwLockReadGuard, RwLockWriteGuard};
+
+#[derive(Debug)]
+pub struct RwLock<T: AsRawFd> {
+    pub(crate) inner: T,
+}
+
+impl<T: AsRawFd> RwLock<T> {
+    #[inline]
+    pub fn new(inner: T) -> Self {
+        panic!("target unsupported")
+    }
+
+    #[inline]
+    pub fn write(&mut self) -> io::Result<RwLockWriteGuard<'_, T>> {
+        panic!("target unsupported")
+    }
+
+    #[inline]
+    pub fn try_write(&mut self) -> Result<RwLockWriteGuard<'_, T>, Error> {
+        panic!("target unsupported")
+    }
+
+    #[inline]
+    pub fn read(&self) -> io::Result<RwLockReadGuard<'_, T>> {
+        panic!("target unsupported")
+    }
+
+    #[inline]
+    pub fn try_read(&self) -> Result<RwLockReadGuard<'_, T>, Error> {
+        panic!("target unsupported")
+    }
+
+    #[inline]
+    pub fn into_inner(self) -> T
+    where
+        T: Sized,
+    {
+        panic!("target unsupported")
+    }
+}
diff --git a/vendor/fd-lock/src/sys/unsupported/utils.rs b/vendor/fd-lock/src/sys/unsupported/utils.rs
new file mode 100644
index 000000000..191dd0c5c
--- /dev/null
+++ b/vendor/fd-lock/src/sys/unsupported/utils.rs
@@ -0,0 +1,9 @@
+use std::io;
+use std::os::raw::c_int;
+
+pub(crate) fn syscall(int: c_int) -> io::Result<()> {
+    match int {
+        0 => Ok(()),
+        _ => Err(io::Error::last_os_error()),
+    }
+}
diff --git a/vendor/fd-lock/src/sys/unsupported/write_guard.rs b/vendor/fd-lock/src/sys/unsupported/write_guard.rs
new file mode 100644
index 000000000..19727c307
--- /dev/null
+++ b/vendor/fd-lock/src/sys/unsupported/write_guard.rs
@@ -0,0 +1,38 @@
+use std::ops;
+use std::os::unix::io::AsRawFd;
+
+use super::RwLock;
+
+#[derive(Debug)]
+pub struct RwLockWriteGuard<'lock, T: AsRawFd> {
+    lock: &'lock mut RwLock<T>,
+}
+
+impl<'lock, T: AsRawFd> RwLockWriteGuard<'lock, T> {
+    pub(crate) fn new(lock: &'lock mut RwLock<T>) -> Self {
+        panic!("target unsupported")
+    }
+}
+
+impl<T: AsRawFd> ops::Deref for RwLockWriteGuard<'_, T> {
+    type Target = T;
+
+    #[inline]
+    fn deref(&self) -> &Self::Target {
+        panic!("target unsupported")
+    }
+}
+
+impl<T: AsRawFd> ops::DerefMut for RwLockWriteGuard<'_, T> {
+    #[inline]
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        panic!("target unsupported")
+    }
+}
+
+impl<T: AsRawFd> Drop for RwLockWriteGuard<'_, T> {
+    #[inline]
+    fn drop(&mut self) {
+        panic!("target unsupported")
+    }
+}
diff --git a/vendor/fd-lock/src/sys/windows/mod.rs b/vendor/fd-lock/src/sys/windows/mod.rs
new file mode 100644
index 000000000..dafbd31ad
--- /dev/null
+++ b/vendor/fd-lock/src/sys/windows/mod.rs
@@ -0,0 +1,8 @@
+mod read_guard;
+mod rw_lock;
+mod utils;
+mod write_guard;
+
+pub use read_guard::RwLockReadGuard;
+pub use rw_lock::RwLock;
+pub use write_guard::RwLockWriteGuard;
diff --git a/vendor/fd-lock/src/sys/windows/read_guard.rs b/vendor/fd-lock/src/sys/windows/read_guard.rs
new file mode 100644
index 000000000..28f09bb95
--- /dev/null
+++ b/vendor/fd-lock/src/sys/windows/read_guard.rs
@@ -0,0 +1,31 @@
+use windows_sys::Win32::Foundation::HANDLE;
+use windows_sys::Win32::Storage::FileSystem::UnlockFile;
+
+use std::ops;
+use std::os::windows::prelude::*;
+
+use super::utils::syscall;
+use super::RwLock;
+
+#[derive(Debug)]
+pub struct RwLockReadGuard<'lock, T: AsRawHandle> {
+    pub(crate) lock: &'lock RwLock<T>,
+}
+
+impl<T: AsRawHandle> ops::Deref for RwLockReadGuard<'_, T> {
+    type Target = T;
+
+    #[inline]
+    fn deref(&self) -> &Self::Target {
+        &self.lock.inner
+    }
+}
+
+impl<T: AsRawHandle> Drop for RwLockReadGuard<'_, T> {
+    #[inline]
+    fn drop(&mut self) {
+        let handle = self.lock.inner.as_raw_handle() as HANDLE;
+        syscall(unsafe { UnlockFile(handle, 0, 0, 1, 0) })
+            .expect("Could not unlock the file descriptor");
+    }
+}
diff --git a/vendor/fd-lock/src/sys/windows/rw_lock.rs b/vendor/fd-lock/src/sys/windows/rw_lock.rs
new file mode 100644
index 000000000..778b79100
--- /dev/null
+++ b/vendor/fd-lock/src/sys/windows/rw_lock.rs
@@ -0,0 +1,72 @@
+use std::io::{self, Error, ErrorKind};
+use std::os::windows::io::AsRawHandle;
+
+use windows_sys::Win32::Foundation::HANDLE;
+use windows_sys::Win32::Storage::FileSystem::{
+    LockFileEx, LOCKFILE_EXCLUSIVE_LOCK, LOCKFILE_FAIL_IMMEDIATELY,
+};
+
+use super::utils::{syscall, Overlapped};
+use super::{RwLockReadGuard, RwLockWriteGuard};
+
+#[derive(Debug)]
+pub struct RwLock<T: AsRawHandle> {
+    pub(crate) inner: T,
+}
+
+impl<T: AsRawHandle> RwLock<T> {
+    #[inline]
+    pub fn new(inner: T) -> Self {
+        RwLock { inner }
+    }
+
+    #[inline]
+    pub fn read(&self) -> io::Result<RwLockReadGuard<'_, T>> {
+        // See: https://stackoverflow.com/a/9186532, https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-lockfileex
+        let handle = self.inner.as_raw_handle() as HANDLE;
+        let overlapped = Overlapped::zero();
+        let flags = 0;
+        syscall(unsafe { LockFileEx(handle, flags, 0, 1, 0, overlapped.raw()) })?;
+        Ok(RwLockReadGuard { lock: self })
+    }
+
+    #[inline]
+    pub fn try_read(&self) -> io::Result<RwLockReadGuard<'_, T>> {
+        let handle = self.inner.as_raw_handle() as HANDLE;
+        let overlapped = Overlapped::zero();
+        let flags = LOCKFILE_FAIL_IMMEDIATELY;
+
+        syscall(unsafe { LockFileEx(handle, flags, 0, 1, 0, overlapped.raw()) })
+            .map_err(|_| Error::from(ErrorKind::WouldBlock))?;
+        Ok(RwLockReadGuard { lock: self })
+    }
+
+    #[inline]
+    pub fn write(&mut self) -> io::Result<RwLockWriteGuard<'_, T>> {
+        // See: https://stackoverflow.com/a/9186532, https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-lockfileex
+        let handle = self.inner.as_raw_handle() as HANDLE;
+        let overlapped = Overlapped::zero();
+        let flags = LOCKFILE_EXCLUSIVE_LOCK;
+        syscall(unsafe { LockFileEx(handle, flags, 0, 1, 0, overlapped.raw()) })?;
+        Ok(RwLockWriteGuard { lock: self })
+    }
+
+    #[inline]
+    pub fn try_write(&mut self) -> io::Result<RwLockWriteGuard<'_, T>> {
+        let handle = self.inner.as_raw_handle() as HANDLE;
+        let overlapped = Overlapped::zero();
+        let flags = LOCKFILE_FAIL_IMMEDIATELY | LOCKFILE_EXCLUSIVE_LOCK;
+
+        syscall(unsafe { LockFileEx(handle, flags, 0, 1, 0, overlapped.raw()) })
+            .map_err(|_| Error::from(ErrorKind::WouldBlock))?;
+        Ok(RwLockWriteGuard { lock: self })
+    }
+
+    #[inline]
+    pub fn into_inner(self) -> T
+    where
+        T: Sized,
+    {
+        self.inner
+    }
+}
diff --git a/vendor/fd-lock/src/sys/windows/utils.rs b/vendor/fd-lock/src/sys/windows/utils.rs
new file mode 100644
index 000000000..43656a083
--- /dev/null
+++ b/vendor/fd-lock/src/sys/windows/utils.rs
@@ -0,0 +1,33 @@
+use std::io;
+use std::mem;
+
+use windows_sys::Win32::Foundation::BOOL;
+use windows_sys::Win32::System::IO::OVERLAPPED;
+
+/// A wrapper around `OVERLAPPED` to provide "rustic" accessors and
+/// initializers.
+pub(crate) struct Overlapped(OVERLAPPED);
+
+impl Overlapped {
+    /// Creates a new zeroed out instance of an overlapped I/O tracking state.
+    ///
+    /// This is suitable for passing to methods which will then later get
+    /// notified via an I/O Completion Port.
+    pub(crate) fn zero() -> Overlapped {
+        Overlapped(unsafe { mem::zeroed() })
+    }
+
+    /// Gain access to the raw underlying data
+    pub(crate) fn raw(&self) -> *mut OVERLAPPED {
+        &self.0 as *const _ as *mut _
+    }
+}
+
+/// Convert a system call which returns a `BOOL` to an `io::Result`.
+pub(crate) fn syscall(status: BOOL) -> std::io::Result<()> {
+    if status == 0 {
+        Err(io::Error::last_os_error())
+    } else {
+        Ok(())
+    }
+}
diff --git a/vendor/fd-lock/src/sys/windows/write_guard.rs b/vendor/fd-lock/src/sys/windows/write_guard.rs
new file mode 100644
index 000000000..5494bd99e
--- /dev/null
+++ b/vendor/fd-lock/src/sys/windows/write_guard.rs
@@ -0,0 +1,38 @@
+use windows_sys::Win32::Foundation::HANDLE;
+use windows_sys::Win32::Storage::FileSystem::UnlockFile;
+
+use std::ops;
+use std::os::windows::prelude::*;
+
+use super::utils::syscall;
+use super::RwLock;
+
+#[derive(Debug)]
+pub struct RwLockWriteGuard<'lock, T: AsRawHandle> {
+    pub(crate) lock: &'lock mut RwLock<T>,
+}
+
+impl<T: AsRawHandle> ops::Deref for RwLockWriteGuard<'_, T> {
+    type Target = T;
+
+    #[inline]
+    fn deref(&self) -> &Self::Target {
+        &self.lock.inner
+    }
+}
+
+impl<T: AsRawHandle> ops::DerefMut for RwLockWriteGuard<'_, T> {
+    #[inline]
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.lock.inner
+    }
+}
+
+impl<T: AsRawHandle> Drop for RwLockWriteGuard<'_, T> {
+    #[inline]
+    fn drop(&mut self) {
+        let handle = self.lock.inner.as_raw_handle() as HANDLE;
+        syscall(unsafe { UnlockFile(handle, 0, 0, 1, 0) })
+            .expect("Could not unlock the file descriptor");
+    }
+}
diff --git a/vendor/fd-lock/src/write_guard.rs b/vendor/fd-lock/src/write_guard.rs
new file mode 100644
index 000000000..e218e3842
--- /dev/null
+++ b/vendor/fd-lock/src/write_guard.rs
@@ -0,0 +1,50 @@
+use std::ops;
+
+use crate::sys;
+
+/// RAII structure used to release the exclusive write access of a lock when
+/// dropped.
+///
+/// This structure is created by the [`write`] and [`try_write`] methods
+/// on [`RwLock`].
+///
+/// [`write`]: crate::RwLock::write
+/// [`try_write`]: crate::RwLock::try_write
+/// [`RwLock`]: crate::RwLock
+///
+/// # Panics
+///
+/// Dropping this type may panic if the lock fails to unlock.
+#[must_use = "if unused the RwLock will immediately unlock"]
+#[derive(Debug)]
+pub struct RwLockWriteGuard<'lock, T: sys::AsRaw> {
+    guard: sys::RwLockWriteGuard<'lock, T>,
+}
+
+impl<'lock, T: sys::AsRaw> RwLockWriteGuard<'lock, T> {
+    pub(crate) fn new(guard: sys::RwLockWriteGuard<'lock, T>) -> Self {
+        Self { guard }
+    }
+}
+
+impl<T: sys::AsRaw> ops::Deref for RwLockWriteGuard<'_, T> {
+    type Target = T;
+
+    #[inline]
+    fn deref(&self) -> &Self::Target {
+        self.guard.deref()
+    }
+}
+
+impl<T: sys::AsRaw> ops::DerefMut for RwLockWriteGuard<'_, T> {
+    #[inline]
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        self.guard.deref_mut()
+    }
+}
+
+/// Release the lock.
+impl<T: sys::AsRaw> Drop for RwLockWriteGuard<'_, T> {
+    #[inline]
+    fn drop(&mut self) {}
+}