library/std/src/sys/windows/rwlock.rs

   1 use crate::cell::UnsafeCell;
   2 use crate::sys::c;
   3
   4 pub struct RWLock {
   5     inner: UnsafeCell<c::SRWLOCK>,
   6 }
   7
   8 unsafe impl Send for RWLock {}
   9 unsafe impl Sync for RWLock {}
  10
  11 impl RWLock {
  12     pub const fn new() -> RWLock {
  13         RWLock { inner: UnsafeCell::new(c::SRWLOCK_INIT) }
  14     }
  15     #[inline]
  16     pub unsafe fn read(&self) {
  17         c::AcquireSRWLockShared(self.inner.get())
  18     }
  19     #[inline]
  20     pub unsafe fn try_read(&self) -> bool {
  21         c::TryAcquireSRWLockShared(self.inner.get()) != 0
  22     }
  23     #[inline]
  24     pub unsafe fn write(&self) {
  25         c::AcquireSRWLockExclusive(self.inner.get())
  26     }
  27     #[inline]
  28     pub unsafe fn try_write(&self) -> bool {
  29         c::TryAcquireSRWLockExclusive(self.inner.get()) != 0
  30     }
  31     #[inline]
  32     pub unsafe fn read_unlock(&self) {
  33         c::ReleaseSRWLockShared(self.inner.get())
  34     }
  35     #[inline]
  36     pub unsafe fn write_unlock(&self) {
  37         c::ReleaseSRWLockExclusive(self.inner.get())
  38     }
  39
  40     #[inline]
  41     pub unsafe fn destroy(&self) {
  42         // ...
  43     }
  44 }