1 files changed, 144 insertions, 0 deletions
diff --git a/library/std/src/sys/hermit/rwlock.rs b/library/std/src/sys/hermit/rwlock.rs
new file mode 100644
index 000000000..9701bab1f
--- /dev/null
+++ b/library/std/src/sys/hermit/rwlock.rs
@@ -0,0 +1,144 @@
+use crate::cell::UnsafeCell;
+use crate::sys::locks::{MovableCondvar, Mutex};
+use crate::sys_common::lazy_box::{LazyBox, LazyInit};
+
+pub struct RwLock {
+    lock: Mutex,
+    cond: MovableCondvar,
+    state: UnsafeCell<State>,
+}
+
+pub type MovableRwLock = RwLock;
+
+enum State {
+    Unlocked,
+    Reading(usize),
+    Writing,
+}
+
+unsafe impl Send for RwLock {}
+unsafe impl Sync for RwLock {}
+
+// This rwlock implementation is a relatively simple implementation which has a
+// condition variable for readers/writers as well as a mutex protecting the
+// internal state of the lock. A current downside of the implementation is that
+// unlocking the lock will notify *all* waiters rather than just readers or just
+// writers. This can cause lots of "thundering stampede" problems. While
+// hopefully correct this implementation is very likely to want to be changed in
+// the future.
+
+impl RwLock {
+    pub const fn new() -> RwLock {
+        RwLock {
+            lock: Mutex::new(),
+            cond: MovableCondvar::new(),
+            state: UnsafeCell::new(State::Unlocked),
+        }
+    }
+
+    #[inline]
+    pub unsafe fn read(&self) {
+        self.lock.lock();
+        while !(*self.state.get()).inc_readers() {
+            self.cond.wait(&self.lock);
+        }
+        self.lock.unlock();
+    }
+
+    #[inline]
+    pub unsafe fn try_read(&self) -> bool {
+        self.lock.lock();
+        let ok = (*self.state.get()).inc_readers();
+        self.lock.unlock();
+        return ok;
+    }
+
+    #[inline]
+    pub unsafe fn write(&self) {
+        self.lock.lock();
+        while !(*self.state.get()).inc_writers() {
+            self.cond.wait(&self.lock);
+        }
+        self.lock.unlock();
+    }
+
+    #[inline]
+    pub unsafe fn try_write(&self) -> bool {
+        self.lock.lock();
+        let ok = (*self.state.get()).inc_writers();
+        self.lock.unlock();
+        return ok;
+    }
+
+    #[inline]
+    pub unsafe fn read_unlock(&self) {
+        self.lock.lock();
+        let notify = (*self.state.get()).dec_readers();
+        self.lock.unlock();
+        if notify {
+            // FIXME: should only wake up one of these some of the time
+            self.cond.notify_all();
+        }
+    }
+
+    #[inline]
+    pub unsafe fn write_unlock(&self) {
+        self.lock.lock();
+        (*self.state.get()).dec_writers();
+        self.lock.unlock();
+        // FIXME: should only wake up one of these some of the time
+        self.cond.notify_all();
+    }
+}
+
+impl State {
+    fn inc_readers(&mut self) -> bool {
+        match *self {
+            State::Unlocked => {
+                *self = State::Reading(1);
+                true
+            }
+            State::Reading(ref mut cnt) => {
+                *cnt += 1;
+                true
+            }
+            State::Writing => false,
+        }
+    }
+
+    fn inc_writers(&mut self) -> bool {
+        match *self {
+            State::Unlocked => {
+                *self = State::Writing;
+                true
+            }
+            State::Reading(_) | State::Writing => false,
+        }
+    }
+
+    fn dec_readers(&mut self) -> bool {
+        let zero = match *self {
+            State::Reading(ref mut cnt) => {
+                *cnt -= 1;
+                *cnt == 0
+            }
+            State::Unlocked | State::Writing => invalid(),
+        };
+        if zero {
+            *self = State::Unlocked;
+        }
+        zero
+    }
+
+    fn dec_writers(&mut self) {
+        match *self {
+            State::Writing => {}
+            State::Unlocked | State::Reading(_) => invalid(),
+        }
+        *self = State::Unlocked;
+    }
+}
+
+fn invalid() -> ! {
+    panic!("inconsistent rwlock");
+}