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thread_specific_ptr.h
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thread_specific_ptr.h
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/******************************************************************************
* SOFA, Simulation Open-Framework Architecture *
* (c) 2006 INRIA, USTL, UJF, CNRS, MGH *
* *
* This program 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; either version 2.1 of the License, or (at *
* your option) any later version. *
* *
* This program 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 program. If not, see <http://www.gnu.org/licenses/>. *
*******************************************************************************
* Authors: The SOFA Team and external contributors (see Authors.txt) *
* *
* Contact information: contact@sofa-framework.org *
******************************************************************************/
#ifndef SOFA_HELPER_SYSTEM_THREAD_THREAD_SPECIFIC_PTR_H
#define SOFA_HELPER_SYSTEM_THREAD_THREAD_SPECIFIC_PTR_H
#if defined(__GNUC__) && (defined(__linux__) || defined(WIN32))
// use __thread
#define SOFA_TLS_KEYWORD __thread
#elif defined(WIN32)
// use __declspec(thread)
#define SOFA_TLS_KEYWORD __declspec(thread)
#else
// use pthread API
#include <pthread.h>
#define SOFA_TLS_PTHREAD
#endif
namespace sofa::helper::system::thread
{
template<class T> class thread_specific_ptr;
#if defined(SOFA_TLS_KEYWORD)
#define SOFA_THREAD_SPECIFIC_PTR(type,name) static SOFA_TLS_KEYWORD type * name = nullptr
#elif defined(SOFA_TLS_PTHREAD)
#define SOFA_THREAD_SPECIFIC_PTR(type,name) static ::sofa::helper::system::thread::thread_specific_ptr<type> name
template<class T>
class thread_specific_ptr
{
private:
pthread_key_t key;
thread_specific_ptr(thread_specific_ptr&); // NO COPY
thread_specific_ptr& operator=(thread_specific_ptr&); // NO ASSIGNEMENT
T* get() const
{
void *ptr = pthread_getspecific(key);
/*
if (!ptr)
{
ptr = new T;
pthread_setspecific(key,ptr);
}
*/
return static_cast<T*>(ptr);
}
static void destructor(void*)
{
}
public:
thread_specific_ptr()
{
pthread_key_create(&key, destructor);
}
~thread_specific_ptr()
{
pthread_key_delete(key);
}
operator T*() const
{
return get();
}
T* operator=(T* ptr)
{
pthread_setspecific(key,ptr);
return ptr;
}
T* operator->() const
{
return get();
}
T& operator*() const
{
return *get();
}
};
#else
#error thread local storage is not supported on your platform
#endif
} // namespace sofa::helper::system::thread
#endif