Security-57336.1.9.tar.gz

[apple/security.git] / Security / libsecurity_utilities / lib / threading_internal.h

diff --git a/Security/libsecurity_utilities/lib/threading_internal.h b/Security/libsecurity_utilities/lib/threading_internal.h
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--- a/Security/libsecurity_utilities/lib/threading_internal.h
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-/*
- * Copyright (c) 2000-2001,2003-2004,2011,2013-2014 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@
- */
-
-
-//
-// threading_internal - internal support classes and functions for threading implementation
-//
-#ifndef _H_THREADING_INTERNAL
-#define _H_THREADING_INTERNAL
-
-#include <security_utilities/utilities.h>
-#include <libkern/OSAtomic.h>
-
-
-namespace Security {
-
-
-//
-// Do we have 64-bit atomic operations?
-//
-#define _HAVE_64BIT_ATOMIC (defined(__ppc64__) || defined(__i386__) || defined(__x86_64__))
-
-
-//
-// The AtomicTypes class is an implementation detail.
-// Do not use it.
-//
-template <unsigned wordsize>
-struct AtomicTypes {
-       // unsupported word size (this will cause compilation errors if used)
-};
-
-template <>
-struct AtomicTypes<32> {
-       typedef int32_t Integer;
-       
-       static Integer add(int delta, Integer &base)
-       { return OSAtomicAdd32(delta, &base); }
-       static Integer addb(int delta, Integer &base) { return OSAtomicAdd32Barrier(delta, &base); }
-       
-       static bool cas(Integer oldValue, Integer newValue, Integer &base)
-       { return OSAtomicCompareAndSwap32(oldValue, newValue, &base); }
-       static bool casb(Integer oldValue, Integer newValue, Integer &base)
-       { return OSAtomicCompareAndSwap32Barrier(oldValue, newValue, &base); }
-};
-
-#if _HAVE_64BIT_ATOMIC
-
-template <>
-struct AtomicTypes<64> {
-       typedef int64_t Integer;
-       
-       static Integer add(int delta, Integer &base) { return OSAtomicAdd64(delta, &base); }
-       static Integer addb(int delta, Integer &base) { return OSAtomicAdd64Barrier(delta, &base); }
-       
-       static bool cas(Integer oldValue, Integer newValue, Integer &base)
-       { return OSAtomicCompareAndSwap64(oldValue, newValue, &base); }
-       static bool casb(Integer oldValue, Integer newValue, Integer &base)
-       { return OSAtomicCompareAndSwap64Barrier(oldValue, newValue, &base); }
-};
-
-#endif //_HAVE_64BIT_ATOMIC
-
-
-//
-// Atomic<Type> is a set of (static) operations that can atomically access memory.
-// This is not a wrapper object. Think of it as a generator class that produces
-// the proper atomic memory operations for arbitrary data types.
-// If the underlying system does not support atomicity for a particular type
-// (e.g. 64 bits on ppc, or 16 bits anywhere), you will get compilation errors.
-//
-template <class Type>
-class Atomic {
-       typedef AtomicTypes<sizeof(Type) * 8> _Ops;
-       typedef typename _Ops::Integer _Type;
-
-public:
-       static Type add(int delta, Type &store)
-       { return Type(_Ops::add(delta, (_Type &)store)); }
-       static Type addb(int delta, Type &store)
-       { return Type(_Ops::addb(delta, (_Type &)store)); }
-       
-       static bool cas(Type oldValue, Type newValue, Type &store)
-       { return _Ops::cas(_Type(oldValue), _Type(newValue), (_Type &)store); }
-       static bool casb(Type oldValue, Type newValue, Type &store)
-       { return _Ops::casb(_Type(oldValue), _Type(newValue), (_Type &)store); }
-       
-       static void barrier() { OSMemoryBarrier(); }
-       static void readBarrier() { OSMemoryBarrier(); }
-       static void writeBarrier() { OSMemoryBarrier(); }
-       
-       // convenience additions (expressed in terms above)
-       
-       static Type increment(Type &store) { return add(1, store); }
-       static Type decrement(Type &store) { return add(-1, store); }
-       
-       static Type load(const Type &store) { readBarrier(); return store; }
-       static Type store(Type value, Type &store)
-       { while (!casb(store, value, store)) {}; return value; }
-};
-
-
-} // end namespace Security
-
-#endif //_H_THREADING_INTERNAL