objc4-709.tar.gz

[apple/objc4.git] / runtime / objc-locks.h

diff --git a/runtime/objc-locks.h b/runtime/objc-locks.h
new file mode 100644 (file)
index 0000000..05bd22f
--- /dev/null
+++ b/runtime/objc-locks.h
@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2017 Apple Inc.  All Rights Reserved.
+ * 
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+/***********************************************************************
+* 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 rwlock_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);
+
+#if __OBJC2__
+#include "objc-locks-new.h"
+#else
+#include "objc-locks-old.h"
+#endif
+
+#endif