lock fixes

ostd/internal/mutex.hh

@@ -86,7 +86,7 @@ struct UniqueLock {
     UniqueLock(): p_mtx(nullptr), p_owns(false) {}
 
     explicit UniqueLock(MutexType &m): p_mtx(&m), p_owns(true) {
-        m->lock();
+        m.lock();
     }
 
     UniqueLock(MutexType &m, DeferLock): p_mtx(&m), p_owns(false) {}
@@ -139,6 +139,13 @@ struct UniqueLock {
         return ret;
     }
 
+    bool unlock() {
+        if (!p_mtx || p_owns) return false;
+        bool ret = p_mtx->unlock();
+        if (ret) p_owns = false;
+        return ret;
+    }
+
     void swap(UniqueLock &u) {
         detail::swap_adl(p_mtx, u.p_mtx);
         detail::swap_adl(p_owns, u.p_owns);

ostd/thread.hh

@@ -71,6 +71,10 @@ namespace this_thread {
     inline void yield() {
         thrd_yield();
     }
+
+    inline void exit() {
+        thrd_exit(0);
+    }
 }
 
 namespace detail {