runtime/objc-locks.h

   1 /*
   2  * Copyright (c) 2017 Apple Inc.  All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 /***********************************************************************
  25 * objc-locks.h
  26 * Declarations of all locks used in the runtime.
  27 **********************************************************************/
  28
  29 #ifndef _OBJC_LOCKS_H
  30 #define _OBJC_LOCKS_H
  31
  32 // fork() safety requires careful tracking of all locks used in the runtime.
  33 // Thou shalt not declare any locks outside this file.
  34
  35 // Lock ordering is declared in _objc_fork_prepare()
  36 // and is enforced by lockdebug.
  37
  38 extern monitor_t classInitLock;
  39 extern rwlock_t selLock;
  40 extern mutex_t cacheUpdateLock;
  41 extern recursive_mutex_t loadMethodLock;
  42 extern mutex_t crashlog_lock;
  43 extern spinlock_t objcMsgLogLock;
  44 extern mutex_t AltHandlerDebugLock;
  45 extern mutex_t AssociationsManagerLock;
  46 extern StripedMap<spinlock_t> PropertyLocks;
  47 extern StripedMap<spinlock_t> StructLocks;
  48 extern StripedMap<spinlock_t> CppObjectLocks;
  49
  50 // SideTable lock is buried awkwardly. Call a function to manipulate it.
  51 extern void SideTableLockAll();
  52 extern void SideTableUnlockAll();
  53 extern void SideTableForceResetAll();
  54 extern void SideTableDefineLockOrder();
  55 extern void SideTableLocksPrecedeLock(const void *newlock);
  56 extern void SideTableLocksSucceedLock(const void *oldlock);
  57
  58 #if __OBJC2__
  59 #include "objc-locks-new.h"
  60 #else
  61 #include "objc-locks-old.h"
  62 #endif
  63
  64 #endif