source: cpp/common/threads.h @ 111

#ifndef _THREADS_H_
#define _THREADS_H_

#ifdef MULTITHREADED

#include <pthread.h>

int sysGetCPUCount();

#ifdef LINUX
//#define USE_CPP_TLS
//#define CPP_TLS __thread
#endif

#ifdef __BORLANDC__ //zakladamy ze wszyscy uzywaja pthreadsowych, bo w tych wbudowanych w c++ w obecnym standardzie nie ma destrukcji obiektow (tylko proste struktury)
//#define USE_CPP_TLS 
//#define CPP_TLS __declspec(thread)
#endif

template<class T> class ThreadSingleton
{
pthread_key_t mt_key;

  public:

ThreadSingleton()
 {
 pthread_key_create(&mt_key,&destructor);
 }

~ThreadSingleton()
 {
 T* o=set(NULL);
 if (o) delete o;
 }

static void destructor(void* o)
 {
 if (o)
         delete (T*)o;
 }

T* set(T* new_o)
 {
 T* o=(T*)pthread_getspecific(mt_key);
 pthread_setspecific(mt_key,new_o);
 return o;
 }

T* get()
 {
 T* o=(T*)pthread_getspecific(mt_key);
 if (!o)
         {
         o=new T();
         pthread_setspecific(mt_key,o);
         }
 return o;
 }

T& getref() {return *get();}
};

#else

template<class T> class ThreadSingleton
{
T object;

  public:

T* get() {return &object;}
T& getref() {return object;}
};

#endif

////////////////////////////////////

#ifdef USE_CPP_TLS

// use c++ implementation (CPP_TLS must also be defined)

#define THREAD_LOCAL_DECL(cls,var) CPP_TLS cls* var
#define THREAD_LOCAL_DEF(cls,var) CPP_TLS cls* var=NULL

template<class T> T* tlsGet(T*& var)
{
if (!var)
        var=new T();
return var;
}

#define tlsGetRef(var) (*tlsGet(var))

template<class T> T* tlsSet(T*& var,T* new_o)
{
T* o=var;
var=new_o;
return o;
}

#else

// use pthreads implementation

#define THREAD_LOCAL_DECL(cls,var) ThreadSingleton<cls> var
#define THREAD_LOCAL_DEF(cls,var) ThreadSingleton<cls> var
#define tlsGet(var) var.get()
#define tlsGetRef(var) var.getref()
#define tlsSet(var,o) var.set(o)

#endif


#endif