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// **********************************************************************
//
// Copyright (c) 2003-2007 ZeroC, Inc. All rights reserved.
//
// This copy of Ice is licensed to you under the terms described in the
// ICE_LICENSE file included in this distribution.
//
// **********************************************************************
#ifndef ICE_UTIL_SHARED_H
#define ICE_UTIL_SHARED_H
#include <IceUtil/Config.h>
#if defined(ICE_USE_MUTEX_SHARED)
# include <IceUtil/Mutex.h>
#elif (defined(__linux) || defined(__FreeBSD__)) && (defined(__i386) || defined(__x86_64)) && !defined(__ICC)
# define ICE_HAS_ATOMIC_FUNCTIONS
namespace IceUtilInternal
{
// __ICC: The inline assembler causes problems with shared libraries.
//
// Linux only. Unfortunately, asm/atomic.h builds non-SMP safe code
// with non-SMP kernels. This means that executables compiled with a
// non-SMP kernel would fail randomly due to concurrency errors with
// reference counting on SMP hosts. Therefore the relevent pieces of
// atomic.h are more-or-less duplicated.
//
/*
* Make sure gcc doesn't try to be clever and move things around
* on us. We need to use _exactly_ the address the user gave us,
* not some alias that contains the same information.
*/
struct AtomicCounter
{
volatile int counter;
};
}
#elif defined(_WIN32)
// Nothing to include
#else
// Use a simple mutex
# include <IceUtil/Mutex.h>
#endif
//
// Base classes for reference counted types. The IceUtil::Handle
// template can be used for smart pointers to types derived from these
// bases.
//
// IceUtil::SimpleShared
// =====================
//
// A non thread-safe base class for reference-counted types.
//
// IceUtil::Shared
// ===============
//
// A thread-safe base class for reference-counted types.
//
namespace IceUtil
{
class ICE_UTIL_API SimpleShared
{
public:
SimpleShared();
SimpleShared(const SimpleShared&);
virtual ~SimpleShared()
{
}
SimpleShared& operator=(const SimpleShared&)
{
return *this;
}
void __incRef()
{
assert(_ref >= 0);
++_ref;
}
void __decRef()
{
assert(_ref > 0);
if(--_ref == 0)
{
if(!_noDelete)
{
_noDelete = true;
delete this;
}
}
}
int __getRef() const
{
return _ref;
}
void __setNoDelete(bool b)
{
_noDelete = b;
}
private:
int _ref;
bool _noDelete;
};
class ICE_UTIL_API Shared
{
public:
Shared();
Shared(const Shared&);
virtual ~Shared()
{
}
Shared& operator=(const Shared&)
{
return *this;
}
virtual void __incRef();
virtual void __decRef();
virtual int __getRef() const;
virtual void __setNoDelete(bool);
protected:
#if defined(_WIN32)
LONG _ref;
#elif defined(ICE_HAS_ATOMIC_FUNCTIONS)
IceUtilInternal::AtomicCounter _ref;
#else
int _ref;
Mutex _mutex;
#endif
bool _noDelete;
};
}
#endif
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