1 files changed, 53 insertions, 0 deletions
diff --git a/src/libstd/sys/windows/rwlock.rs b/src/libstd/sys/windows/rwlock.rs
new file mode 100644
index 00000000000..88ce85c39f6
--- /dev/null
+++ b/src/libstd/sys/windows/rwlock.rs
@@ -0,0 +1,53 @@
+// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use cell::UnsafeCell;
+use sys::sync as ffi;
+
+pub struct RWLock { inner: UnsafeCell<ffi::SRWLOCK> }
+
+pub const RWLOCK_INIT: RWLock = RWLock {
+    inner: UnsafeCell { value: ffi::SRWLOCK_INIT }
+};
+
+impl RWLock {
+    #[inline]
+    pub unsafe fn new() -> RWLock { RWLOCK_INIT }
+
+    #[inline]
+    pub unsafe fn read(&self) {
+        ffi::AcquireSRWLockShared(self.inner.get())
+    }
+    #[inline]
+    pub unsafe fn try_read(&self) -> bool {
+        ffi::TryAcquireSRWLockShared(self.inner.get()) != 0
+    }
+    #[inline]
+    pub unsafe fn write(&self) {
+        ffi::AcquireSRWLockExclusive(self.inner.get())
+    }
+    #[inline]
+    pub unsafe fn try_write(&self) -> bool {
+        ffi::TryAcquireSRWLockExclusive(self.inner.get()) != 0
+    }
+    #[inline]
+    pub unsafe fn read_unlock(&self) {
+        ffi::ReleaseSRWLockShared(self.inner.get())
+    }
+    #[inline]
+    pub unsafe fn write_unlock(&self) {
+        ffi::ReleaseSRWLockExclusive(self.inner.get())
+    }
+
+    #[inline]
+    pub unsafe fn destroy(&self) {
+        // ...
+    }
+}