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/**
* @file llthreadlocalstorage.h
* @author Richard
* @brief Class wrappers for thread local storage
*
* $LicenseInfo:firstyear=2004&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#ifndef LL_LLTHREADLOCALSTORAGE_H
#define LL_LLTHREADLOCALSTORAGE_H
#include "llinstancetracker.h"
#include "llapr.h"
class LLThreadLocalPointerBase : public LLInstanceTracker<LLThreadLocalPointerBase>
{
public:
LLThreadLocalPointerBase()
: mThreadKey(NULL)
{
if (sInitialized)
{
initStorage();
}
}
LLThreadLocalPointerBase( const LLThreadLocalPointerBase& other)
: mThreadKey(NULL)
{
if (sInitialized)
{
initStorage();
}
}
~LLThreadLocalPointerBase()
{
destroyStorage();
}
static void initAllThreadLocalStorage();
static void destroyAllThreadLocalStorage();
protected:
void set(void* value);
LL_FORCE_INLINE void* get() const
{
// llassert(sInitialized);
void* ptr;
apr_status_t result =
apr_threadkey_private_get(&ptr, mThreadKey);
if (result != APR_SUCCESS)
{
ll_apr_warn_status(result);
llerrs << "Failed to get thread local data" << llendl;
}
return ptr;
}
void initStorage();
void destroyStorage();
protected:
apr_threadkey_t* mThreadKey;
static bool sInitialized;
};
template <typename T>
class LLThreadLocalPointer : public LLThreadLocalPointerBase
{
public:
LLThreadLocalPointer()
{}
explicit LLThreadLocalPointer(T* value)
{
set(value);
}
LLThreadLocalPointer(const LLThreadLocalPointer<T>& other)
: LLThreadLocalPointerBase(other)
{
set(other.get());
}
LL_FORCE_INLINE T* get() const
{
return (T*)LLThreadLocalPointerBase::get();
}
T* operator -> () const
{
return (T*)get();
}
T& operator*() const
{
return *(T*)get();
}
LLThreadLocalPointer<T>& operator = (T* value)
{
set((void*)value);
return *this;
}
bool operator ==(const T* other) const
{
if (!sInitialized) return false;
return get() == other;
}
};
template<typename DERIVED_TYPE>
class LLThreadLocalSingleton
{
typedef enum e_init_state
{
UNINITIALIZED = 0,
CONSTRUCTING,
INITIALIZING,
INITIALIZED,
DELETED
} EInitState;
public:
LLThreadLocalSingleton()
{}
virtual ~LLThreadLocalSingleton()
{
sInstance = NULL;
sInitState = DELETED;
}
static void deleteSingleton()
{
delete sInstance;
sInstance = NULL;
sInitState = DELETED;
}
static DERIVED_TYPE* getInstance()
{
if (sInitState == CONSTRUCTING)
{
llerrs << "Tried to access singleton " << typeid(DERIVED_TYPE).name() << " from singleton constructor!" << llendl;
}
if (sInitState == DELETED)
{
llwarns << "Trying to access deleted singleton " << typeid(DERIVED_TYPE).name() << " creating new instance" << llendl;
}
if (!sInstance)
{
sInitState = CONSTRUCTING;
sInstance = new DERIVED_TYPE();
sInitState = INITIALIZING;
sInstance->initSingleton();
sInitState = INITIALIZED;
}
return sInstance;
}
static DERIVED_TYPE* getIfExists()
{
return sInstance;
}
// Reference version of getInstance()
// Preferred over getInstance() as it disallows checking for NULL
static DERIVED_TYPE& instance()
{
return *getInstance();
}
// Has this singleton been created uet?
// Use this to avoid accessing singletons before the can safely be constructed
static bool instanceExists()
{
return sInitState == INITIALIZED;
}
// Has this singleton already been deleted?
// Use this to avoid accessing singletons from a static object's destructor
static bool destroyed()
{
return sInitState == DELETED;
}
private:
LLThreadLocalSingleton(const LLThreadLocalSingleton& other);
virtual void initSingleton() {}
static __declspec(thread) DERIVED_TYPE* sInstance;
static __declspec(thread) EInitState sInitState;
};
template<typename DERIVED_TYPE>
__declspec(thread) DERIVED_TYPE* LLThreadLocalSingleton<DERIVED_TYPE>::sInstance = NULL;
template<typename DERIVED_TYPE>
__declspec(thread) typename LLThreadLocalSingleton<DERIVED_TYPE>::EInitState LLThreadLocalSingleton<DERIVED_TYPE>::sInitState = LLThreadLocalSingleton<DERIVED_TYPE>::UNINITIALIZED;
template<typename DERIVED_TYPE>
class LLThreadLocalSingletonPointer
{
public:
void operator =(DERIVED_TYPE* value)
{
sInstance = value;
}
LL_FORCE_INLINE static DERIVED_TYPE* getInstance()
{
return sInstance;
}
LL_FORCE_INLINE static void setInstance(DERIVED_TYPE* instance)
{
sInstance = instance;
}
private:
static __declspec(thread) DERIVED_TYPE* sInstance;
};
template<typename DERIVED_TYPE>
__declspec(thread) DERIVED_TYPE* LLThreadLocalSingletonPointer<DERIVED_TYPE>::sInstance = NULL;
#endif // LL_LLTHREADLOCALSTORAGE_H
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