study_objc4/objc4-750/runtime/objc-locks.h

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 * Copyright (c) 2017 Apple Inc.  All Rights Reserved.
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 * 
 * This file contains Original Code and/or Modifications of Original Code
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 * file.
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/***********************************************************************
* objc-locks.h
* Declarations of all locks used in the runtime.
**********************************************************************/

#ifndef _OBJC_LOCKS_H
#define _OBJC_LOCKS_H

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

// Lock ordering is declared in _objc_fork_prepare()
// and is enforced by lockdebug.

extern monitor_t classInitLock;
extern mutex_t selLock;
extern mutex_t cacheUpdateLock;
extern recursive_mutex_t loadMethodLock;
extern mutex_t crashlog_lock;
extern spinlock_t objcMsgLogLock;
extern mutex_t AltHandlerDebugLock;
extern mutex_t AssociationsManagerLock;
extern StripedMap<spinlock_t> PropertyLocks;
extern StripedMap<spinlock_t> StructLocks;
extern StripedMap<spinlock_t> CppObjectLocks;

// SideTable lock is buried awkwardly. Call a function to manipulate it.
extern void SideTableLockAll();
extern void SideTableUnlockAll();
extern void SideTableForceResetAll();
extern void SideTableDefineLockOrder();
extern void SideTableLocksPrecedeLock(const void *newlock);
extern void SideTableLocksSucceedLock(const void *oldlock);
extern void SideTableLocksPrecedeLocks(StripedMap<spinlock_t>& newlocks);
extern void SideTableLocksSucceedLocks(StripedMap<spinlock_t>& oldlocks);

#if __OBJC2__
#include "objc-locks-new.h"
#else
#include "objc-locks-old.h"
#endif

#endif