[Hack] Only unlock lock when actually held by current thread

There’s something else wrong here, but I can’t run things locally, so, let’s go with this for now.

Signed-off-by: Stefan Marr <[email protected]>

Author: smarr

src/som/primitives/threading/MutexPrimitives.java

@@ -82,7 +82,9 @@ public abstract static class UnlockPrim extends UnaryExpressionNode {
     @TruffleBoundary
     @Specialization
     public static final ReentrantLock unlock(final ReentrantLock lock) {
-      lock.unlock();
+      if (lock.isHeldByCurrentThread()) {
+        lock.unlock();
+      }
       return lock;
     }