study_objc4/objc4-779.1/runtime/objc-locks-new.h

/*
 * Copyright (c) 2017 Apple Inc.  All Rights Reserved.
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/***********************************************************************
* objc-locks-new.h
* Declarations of all locks used in the runtime.
**********************************************************************/

#ifndef _OBJC_LOCKS_NEW_H
#define _OBJC_LOCKS_NEW_H

// fork() safety requires careful tracking of all locks used in the runtime.
// Thou shalt not declare any locks outside this file.

extern mutex_t runtimeLock;
extern mutex_t DemangleCacheLock;

#endif