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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"
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);
void* get() const;
void initStorage();
void destroyStorage();
protected:
struct 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;
}
bool isNull() const { return !sInitialized || get() == NULL; }
bool notNull() const { return sInitialized && get() != NULL; }
};
template<typename DERIVED_TYPE>
class LLThreadLocalSingletonPointer
{
public:
LL_FORCE_INLINE static DERIVED_TYPE* getInstance()
{
#if LL_DARWIN
createTLSKey();
return (DERIVED_TYPE*)pthread_getspecific(sInstanceKey);
#else
return sInstance;
#endif
}
static void setInstance(DERIVED_TYPE* instance)
{
#if LL_DARWIN
createTLSKey();
pthread_setspecific(sInstanceKey, (void*)instance);
#else
sInstance = instance;
#endif
}
private:
#if LL_WINDOWS
static __declspec(thread) DERIVED_TYPE* sInstance;
#elif LL_LINUX
static __thread DERIVED_TYPE* sInstance;
#elif LL_DARWIN
static void TLSError()
{
LL_ERRS() << "Could not create thread local storage" << LL_ENDL;
}
static void createTLSKey()
{
static S32 key_created = pthread_key_create(&sInstanceKey, NULL);
if (key_created != 0)
{
LL_ERRS() << "Could not create thread local storage" << LL_ENDL;
}
}
static pthread_key_t sInstanceKey;
#endif
};
#if LL_WINDOWS
template<typename DERIVED_TYPE>
__declspec(thread) DERIVED_TYPE* LLThreadLocalSingletonPointer<DERIVED_TYPE>::sInstance = NULL;
#elif LL_LINUX
template<typename DERIVED_TYPE>
__thread DERIVED_TYPE* LLThreadLocalSingletonPointer<DERIVED_TYPE>::sInstance = NULL;
#elif LL_DARWIN
template<typename DERIVED_TYPE>
pthread_key_t LLThreadLocalSingletonPointer<DERIVED_TYPE>::sInstanceKey;
#endif
#endif // LL_LLTHREADLOCALSTORAGE_H
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