src/libstd/sys/windows/rwlock.rs

   1 // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 use prelude::v1::*;
  12
  13 use cell::UnsafeCell;
  14 use sys::sync as ffi;
  15
  16 pub struct RWLock { inner: UnsafeCell<ffi::SRWLOCK> }
  17
  18 unsafe impl Send for RWLock {}
  19 unsafe impl Sync for RWLock {}
  20
  21 impl RWLock {
  22     pub const fn new() -> RWLock {
  23         RWLock { inner: UnsafeCell::new(ffi::SRWLOCK_INIT) }
  24     }
  25     #[inline]
  26     pub unsafe fn read(&self) {
  27         ffi::AcquireSRWLockShared(self.inner.get())
  28     }
  29     #[inline]
  30     pub unsafe fn try_read(&self) -> bool {
  31         ffi::TryAcquireSRWLockShared(self.inner.get()) != 0
  32     }
  33     #[inline]
  34     pub unsafe fn write(&self) {
  35         ffi::AcquireSRWLockExclusive(self.inner.get())
  36     }
  37     #[inline]
  38     pub unsafe fn try_write(&self) -> bool {
  39         ffi::TryAcquireSRWLockExclusive(self.inner.get()) != 0
  40     }
  41     #[inline]
  42     pub unsafe fn read_unlock(&self) {
  43         ffi::ReleaseSRWLockShared(self.inner.get())
  44     }
  45     #[inline]
  46     pub unsafe fn write_unlock(&self) {
  47         ffi::ReleaseSRWLockExclusive(self.inner.get())
  48     }
  49
  50     #[inline]
  51     pub unsafe fn destroy(&self) {
  52         // ...
  53     }
  54 }