Fix error with latest parking_lot version

Author: coolreader18

Cargo.lock

@@ -121,13 +121,17 @@ impl PyLock {
     }
     #[pymethod]
     #[pymethod(name = "release_lock")]
-    fn release(&self) {
-        self.mu.unlock()
+    fn release(&self, vm: &VirtualMachine) -> PyResult<()> {
+        if self.mu.is_locked() {
+            return Err(vm.new_runtime_error("release unlocked lock".to_owned()));
+        }
+        unsafe { self.mu.unlock() };
+        Ok(())
     }
 
     #[pymethod(magic)]
-    fn exit(&self, _args: PyFuncArgs) {
-        self.release()
+    fn exit(&self, _args: PyFuncArgs, vm: &VirtualMachine) -> PyResult<()> {
+        self.release(vm)
     }
 
     #[pymethod]
@@ -178,13 +182,17 @@ impl PyRLock {
     }
     #[pymethod]
     #[pymethod(name = "release_lock")]
-    fn release(&self) {
-        self.mu.unlock()
+    fn release(&self, vm: &VirtualMachine) -> PyResult<()> {
+        if self.mu.is_locked() {
+            return Err(vm.new_runtime_error("release unlocked lock".to_owned()));
+        }
+        unsafe { self.mu.unlock() };
+        Ok(())
     }
 
     #[pymethod(magic)]
-    fn exit(&self, _args: PyFuncArgs) {
-        self.release()
+    fn exit(&self, _args: PyFuncArgs, vm: &VirtualMachine) -> PyResult<()> {
+        self.release(vm)
     }
 
     #[pymethod(magic)]
@@ -237,7 +245,9 @@ fn thread_start_new_thread(
         }
         SENTINELS.with(|sents| {
             for lock in sents.replace(Default::default()) {
-                lock.mu.unlock()
+                if lock.mu.is_locked() {
+                    unsafe { lock.mu.unlock() };
+                }
             }
         });
         vm.state.thread_count.fetch_sub(1);