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authorBotahamec <botahamec@outlook.com>2025-03-29 17:34:10 -0400
committerBotahamec <botahamec@outlook.com>2025-03-29 17:34:10 -0400
commit17dab88a7b4bc86cf156a1e0ac1bac19e6f9f5c6 (patch)
tree59f7ddaf743899be6b5ddd7ecf1b38882c50087d /src/rwlock/write_lock.rs
parent3a299432173f98521d0aeb840dafb6710ce27f82 (diff)
Clean up existing documentation
Diffstat (limited to 'src/rwlock/write_lock.rs')
-rw-r--r--src/rwlock/write_lock.rs229
1 files changed, 0 insertions, 229 deletions
diff --git a/src/rwlock/write_lock.rs b/src/rwlock/write_lock.rs
deleted file mode 100644
index 6469a67..0000000
--- a/src/rwlock/write_lock.rs
+++ /dev/null
@@ -1,229 +0,0 @@
-use std::fmt::Debug;
-
-use lock_api::RawRwLock;
-
-use crate::lockable::{Lockable, RawLock};
-use crate::{Keyable, ThreadKey};
-
-use super::{RwLock, RwLockWriteGuard, RwLockWriteRef, WriteLock};
-
-unsafe impl<T, R: RawRwLock> RawLock for WriteLock<'_, T, R> {
- fn poison(&self) {
- self.0.poison()
- }
-
- unsafe fn raw_write(&self) {
- self.0.raw_write()
- }
-
- unsafe fn raw_try_write(&self) -> bool {
- self.0.raw_try_write()
- }
-
- unsafe fn raw_unlock_write(&self) {
- self.0.raw_unlock_write()
- }
-
- unsafe fn raw_read(&self) {
- self.0.raw_write()
- }
-
- unsafe fn raw_try_read(&self) -> bool {
- self.0.raw_try_write()
- }
-
- unsafe fn raw_unlock_read(&self) {
- self.0.raw_unlock_write()
- }
-}
-
-unsafe impl<T, R: RawRwLock> Lockable for WriteLock<'_, T, R> {
- type Guard<'g>
- = RwLockWriteRef<'g, T, R>
- where
- Self: 'g;
-
- type DataMut<'a>
- = &'a mut T
- where
- Self: 'a;
-
- fn get_ptrs<'a>(&'a self, ptrs: &mut Vec<&'a dyn RawLock>) {
- ptrs.push(self.0);
- }
-
- unsafe fn guard(&self) -> Self::Guard<'_> {
- RwLockWriteRef::new(self.as_ref())
- }
-
- unsafe fn data_mut(&self) -> Self::DataMut<'_> {
- self.0.data_mut()
- }
-}
-
-// Technically, the exclusive locks can also be shared, but there's currently
-// no way to express that. I don't think I want to ever express that.
-
-#[mutants::skip]
-#[cfg(not(tarpaulin_include))]
-impl<T: Debug, R: RawRwLock> Debug for WriteLock<'_, T, R> {
- fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
- // safety: this is just a try lock, and the value is dropped
- // immediately after, so there's no risk of blocking ourselves
- // or any other threads
- // It makes zero sense to try using an exclusive lock for this, so this
- // is the only time when WriteLock does a read.
- if let Some(value) = unsafe { self.0.try_read_no_key() } {
- f.debug_struct("WriteLock").field("data", &&*value).finish()
- } else {
- struct LockedPlaceholder;
- impl Debug for LockedPlaceholder {
- fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
- f.write_str("<locked>")
- }
- }
-
- f.debug_struct("WriteLock")
- .field("data", &LockedPlaceholder)
- .finish()
- }
- }
-}
-
-impl<'l, T, R> From<&'l RwLock<T, R>> for WriteLock<'l, T, R> {
- fn from(value: &'l RwLock<T, R>) -> Self {
- Self::new(value)
- }
-}
-
-impl<T: ?Sized, R> AsRef<RwLock<T, R>> for WriteLock<'_, T, R> {
- fn as_ref(&self) -> &RwLock<T, R> {
- self.0
- }
-}
-
-impl<'l, T, R> WriteLock<'l, T, R> {
- /// Creates a new `WriteLock` which accesses the given [`RwLock`]
- ///
- /// # Examples
- ///
- /// ```
- /// use happylock::{rwlock::WriteLock, RwLock};
- ///
- /// let lock = RwLock::new(5);
- /// let write_lock = WriteLock::new(&lock);
- /// ```
- #[must_use]
- pub const fn new(rwlock: &'l RwLock<T, R>) -> Self {
- Self(rwlock)
- }
-}
-
-impl<T, R: RawRwLock> WriteLock<'_, T, R> {
- pub fn scoped_lock<'a, Ret>(&'a self, key: impl Keyable, f: impl Fn(&'a mut T) -> Ret) -> Ret {
- self.0.scoped_write(key, f)
- }
-
- pub fn scoped_try_lock<'a, Key: Keyable, Ret>(
- &'a self,
- key: Key,
- f: impl Fn(&'a mut T) -> Ret,
- ) -> Result<Ret, Key> {
- self.0.scoped_try_write(key, f)
- }
-
- /// Locks the underlying [`RwLock`] with exclusive write access, blocking
- /// the current until it can be acquired.
- ///
- /// This function will not return while other writers or readers currently
- /// have access to the lock.
- ///
- /// Returns an RAII guard which will drop the write access of this `RwLock`
- /// when dropped.
- ///
- /// Because this method takes a [`ThreadKey`], it's not possible for this
- /// method to cause a deadlock.
- ///
- /// # Examples
- ///
- /// ```
- /// use happylock::{ThreadKey, RwLock};
- /// use happylock::rwlock::WriteLock;
- ///
- /// let key = ThreadKey::get().unwrap();
- /// let lock = RwLock::new(1);
- /// let writer = WriteLock::new(&lock);
- ///
- /// let mut n = writer.lock(key);
- /// *n += 2;
- /// ```
- ///
- /// [`ThreadKey`]: `crate::ThreadKey`
- #[must_use]
- pub fn lock(&self, key: ThreadKey) -> RwLockWriteGuard<'_, T, R> {
- self.0.write(key)
- }
-
- /// Attempts to lock the underlying [`RwLock`] with exclusive write access.
- ///
- /// This function does not block. If the lock could not be acquired at this
- /// time, then `None` is returned. Otherwise, an RAII guard is returned
- /// which will release the lock when it is dropped.
- ///
- /// 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 [`RwLock`] could not be acquired because it was already locked,
- /// then an error will be returned containing the given key.
- ///
- /// # Examples
- ///
- /// ```
- /// use happylock::{RwLock, ThreadKey};
- /// use happylock::rwlock::WriteLock;
- ///
- /// let key = ThreadKey::get().unwrap();
- /// let lock = RwLock::new(1);
- /// let writer = WriteLock::new(&lock);
- ///
- /// match writer.try_lock(key) {
- /// Ok(n) => assert_eq!(*n, 1),
- /// Err(_) => unreachable!(),
- /// };
- /// ```
- pub fn try_lock(&self, key: ThreadKey) -> Result<RwLockWriteGuard<'_, T, R>, ThreadKey> {
- self.0.try_write(key)
- }
-
- // There's no `try_lock_no_key`. Instead, `try_read_no_key` is called on
- // the referenced `RwLock`.
-
- /// Immediately drops the guard, and consequently releases the exclusive
- /// lock on the underlying [`RwLock`].
- ///
- /// This function is equivalent to calling [`drop`] on the guard, except
- /// that it returns the key that was used to create it. Alternately, the
- /// guard will be automatically dropped when it goes out of scope.
- ///
- /// # Examples
- ///
- /// ```
- /// use happylock::{RwLock, ThreadKey};
- /// use happylock::rwlock::WriteLock;
- ///
- /// let key = ThreadKey::get().unwrap();
- /// let lock = RwLock::new(0);
- /// let writer = WriteLock::new(&lock);
- ///
- /// let mut guard = writer.lock(key);
- /// *guard += 20;
- /// let key = WriteLock::unlock(guard);
- /// ```
- #[must_use]
- pub fn unlock(guard: RwLockWriteGuard<'_, T, R>) -> ThreadKey {
- RwLock::unlock_write(guard)
- }
-}