vendor/fd-lock/src/sys/windows/read_guard.rs

   1 use windows_sys::Win32::Foundation::HANDLE;
   2 use windows_sys::Win32::Storage::FileSystem::UnlockFile;
   3
   4 use std::ops;
   5 use std::os::windows::prelude::*;
   6
   7 use super::utils::syscall;
   8 use super::RwLock;
   9
  10 #[derive(Debug)]
  11 pub struct RwLockReadGuard<'lock, T: AsRawHandle> {
  12     pub(crate) lock: &'lock RwLock<T>,
  13 }
  14
  15 impl<T: AsRawHandle> ops::Deref for RwLockReadGuard<'_, T> {
  16     type Target = T;
  17
  18     #[inline]
  19     fn deref(&self) -> &Self::Target {
  20         &self.lock.inner
  21     }
  22 }
  23
  24 impl<T: AsRawHandle> Drop for RwLockReadGuard<'_, T> {
  25     #[inline]
  26     fn drop(&mut self) {
  27         let handle = self.lock.inner.as_raw_handle() as HANDLE;
  28         let _ = syscall(unsafe { UnlockFile(handle, 0, 0, 1, 0) });
  29     }
  30 }