feat: SharedMutex is_locked; use of binary mtx

modules/terrain/shared_mutex.cpp

@@ -28,6 +28,16 @@ void SharedMutex::unlock_exclusive() {
 	this->lock.unlock();
 }
 
+bool SharedMutex::is_locked() {
+	if (this->lock.try_lock()) {
+		bool locked{ this->shared_count != 0 };
+		this->lock.unlock();
+		return locked;
+	} else {
+		return false;
+	}
+}
+
 SharedMutex::LockExclusive::LockExclusive(SharedMutex &mutex) : mtx{ mutex } {
 	this->mtx.lock_exclusive();
 }

modules/terrain/shared_mutex.h

@@ -7,10 +7,11 @@ struct SharedMutex {
 	void unlock_shared();
 	void lock_exclusive();
 	void unlock_exclusive();
+	bool is_locked();
 
 private:
-	Mutex lock{};
-	int shared_count{};
+	BinaryMutex lock{};
+	unsigned shared_count{};
 
 public:
 	class LockExclusive {