Question

I’d like to use __thread modifier, as a substitution for thread_local from C++11, in g++. Unfortunately my local thread variable doesn’t have trivial constructor (it has to set the value of one integer components).
I think about using this kind of construction:

__thread MyVariable *var;

__thread MyVariable* MyClass::var = nullptr;

End every time I’d like to get an acces to var I check if it was allocated:

if(var == nullptr)
   var = new MyVariable(42);

But I have no idea, how to free allocated in this way memory.

Answer 1

__thread storage specifier can not handle objects with non-trivial constructors and destructors.

For objects with non-trivial constructors and destructors you may like to use boost::thread_specfic_ptr<>. When a thread terminates boost::thread_specfic_ptr<> invokes delete on the corresponding thread-specific object.