sync: use usize instead of u32 for SemaphorePermit::split (#6478)

Signed-off-by: Alice Ryhl <[email protected]>

tokio/src/sync/semaphore.rs

@@ -994,7 +994,9 @@ impl<'a> SemaphorePermit<'a> {
  /// Splits `n` permits from `self` and returns a new [`SemaphorePermit`] instance that holds `n` permits.
  ///
  /// If there are insufficient permits and it's not possible to reduce by `n`, returns `None`.
- pub fn split(&mut self, n: u32) -> Option<Self> {
+ pub fn split(&mut self, n: usize) -> Option<Self> {
+ let n = u32::try_from(n).ok()?;
+
  if n > self.permits {
  return None;
  }
@@ -1008,8 +1010,8 @@ impl<'a> SemaphorePermit<'a> {
  }
 
  /// Returns the number of permits held by `self`.
- pub fn num_permits(&self) -> u32 {
- self.permits
+ pub fn num_permits(&self) -> usize {
+ self.permits as usize
  }
 }
 
@@ -1047,7 +1049,9 @@ impl OwnedSemaphorePermit {
  /// # Note
  ///
  /// It will clone the owned `Arc<Semaphore>` to construct the new instance.
- pub fn split(&mut self, n: u32) -> Option<Self> {
+ pub fn split(&mut self, n: usize) -> Option<Self> {
+ let n = u32::try_from(n).ok()?;
+
  if n > self.permits {
  return None;
  }
@@ -1066,8 +1070,8 @@ impl OwnedSemaphorePermit {
  }
 
  /// Returns the number of permits held by `self`.
- pub fn num_permits(&self) -> u32 {
- self.permits
+ pub fn num_permits(&self) -> usize {
+ self.permits as usize
  }
 }