1 files changed, 42 insertions, 0 deletions
diff --git a/library/std/src/sys/windows/locks/rwlock.rs b/library/std/src/sys/windows/locks/rwlock.rs
new file mode 100644
index 000000000..fa5ffe574
--- /dev/null
+++ b/library/std/src/sys/windows/locks/rwlock.rs
@@ -0,0 +1,42 @@
+use crate::cell::UnsafeCell;
+use crate::sys::c;
+
+pub struct RwLock {
+    inner: UnsafeCell<c::SRWLOCK>,
+}
+
+pub type MovableRwLock = RwLock;
+
+unsafe impl Send for RwLock {}
+unsafe impl Sync for RwLock {}
+
+impl RwLock {
+    #[inline]
+    pub const fn new() -> RwLock {
+        RwLock { inner: UnsafeCell::new(c::SRWLOCK_INIT) }
+    }
+    #[inline]
+    pub unsafe fn read(&self) {
+        c::AcquireSRWLockShared(self.inner.get())
+    }
+    #[inline]
+    pub unsafe fn try_read(&self) -> bool {
+        c::TryAcquireSRWLockShared(self.inner.get()) != 0
+    }
+    #[inline]
+    pub unsafe fn write(&self) {
+        c::AcquireSRWLockExclusive(self.inner.get())
+    }
+    #[inline]
+    pub unsafe fn try_write(&self) -> bool {
+        c::TryAcquireSRWLockExclusive(self.inner.get()) != 0
+    }
+    #[inline]
+    pub unsafe fn read_unlock(&self) {
+        c::ReleaseSRWLockShared(self.inner.get())
+    }
+    #[inline]
+    pub unsafe fn write_unlock(&self) {
+        c::ReleaseSRWLockExclusive(self.inner.get())
+    }
+}