Re: [boost] [threads] Unexpected behaviour of Thread loal storage

Subject: Re: [boost] [threads] Unexpected behaviour of Thread loal storage
From: Fu ji (fujimailing_at_[hidden])
Date: 2015-05-06 02:37:44

I try to summing up all things:

I try to export thread local storage (dllexport)
from firstmodule and import in secondmodule (dllimport) but with no effect.
In firstmodule I have Includes/ThreadLocalStorage.h with delaration:

#include <boost/thread/tss.hpp>

namespace threads {

                               extern __declspec(dllexport)
boost::thread_specific_ptr<int> TlsStorage;
                               extern __declspec(dllexport) int
tls_value_storage = 0;

}

integer tls_value_storage  is for testing purpose only. There is also
Src/ThreadLocalStorage.cpp with:

#include <Include/ThreadLocalStorage.h>

namespace threads {

                               __declspec(dllexport)
boost::thread_specific_ptr<int> TlsStorage;
                               extern __declspec(dllexport) int
tls_value_storage;
}

and the last one: in stdafx.h in secondmodule module:

namespace threads {

                               extern __declspec(dllimport)
boost::thread_specific_ptr<int> TlsStorage;
                               extern __declspec(dllimport) int
tls_value_storage2;
}

But after all when I try to change set tls in secondmodule

                threads::TlsStorage.reset(&new_language_value);
                int *sanity_check = threads::TlxStorage.get();  //.get()
return proper value

                Funtion();

Now we go to the firstmodule, function() (using the same thread)

                int sanity_check_1 = threads::tls_value_storage; //Proper
value
                int *sanity_check_2 = threads::TlsStorage.get(); //
Something bad happens, return uninitialized tls

I think it can be fault of missing extern before __declspec(dllexport)
boost::thread_specific_ptr<int> TlsStorage
in ThreadLoalStorage.cpp but when I add "extern" I have:

error LNK2001: unresolved external symbol "__declspec(dllimport) class
boost::thread_specific_ptr<int> threads::TlsStorage"
(__imp_?TlsStorage_at_threads@tlx@@3V?$thread_specific_ptr_at_H@boost@@A)

in compiling process. Maybe it's some issue with mangling ?