Re: [Cppcms-users] singleton per thread

[Daniel V. <chi...@gm...>]

Hello.

The following simple code cause segmentation fault with both
booster::thread_specific_ptr and boost::thread_specific_ptr versions
when a client call "sum" rpc method.

I don't know why.

I missing something?

Thank you.


#include <cppcms/application.h>
#include <cppcms/service.h>
#include <cppcms/applications_pool.h>
#include <cppcms/rpc_json.h>

#include <booster/thread.h>

booster::thread_specific_ptr<int> thread_int;

class json_service : public cppcms::rpc::json_rpc_server {
public:
    json_service(cppcms::service &srv) :
cppcms::rpc::json_rpc_server(srv)
    {

bind("sum",cppcms::rpc::json_method(&json_service::sum,this),method_role);
        thread_int.reset(new int(0));
    }
    
    void sum(int x,int y)
    {
	// FIXME: this line cause segmentation fault
        std::cout << "thread_int = " << (*thread_int) << std::endl;
        return_result(x+y);
    }
};

int main(int argc, char **argv)
{
    try {
        cppcms::service srv(argc,argv);

srv.applications_pool().mount( cppcms::applications_factory<json_service>());
        srv.run();
    }
    catch(std::exception const &e) {
        std::cerr << e.what() << std::endl;
        return 1;
    }
    return 0;
}


On Tue, 2010-09-28 at 14:05 -0700, Artyom wrote:
> Store it as member of your applications,
> application instances are cached.
> 
> You can also use booster::thread_specific_ptr 
> 
> See as example wikipp.
> Artyom
> 
> P.S.: Soci has connection pool as well.
> 
> 
> ----- Original Message ----
> > From: Daniel Vallejos <chi...@gm...>
> > To: cpp...@li...
> > Sent: Tue, September 28, 2010 7:44:14 PM
> > Subject: [Cppcms-users] singleton per thread
> > 
> > Hello.
> > 
> > I use soci for database access.
> > 
> > The soci session object is  not "thread safe".
> > 
> > AFAIK each cppcms::application object runs in a  thread.
> > 
> > Then I need a "singleton per thread" or "thread local storage". 
> > 
> > How to accomplish this with cppcms?
> > 
> > I try to use  "boost::thread_specific_ptr" with no luck  (segmentation
> > fault).
> > 
> > 
> > Thanks.
> > 
> > 
> > 
> > 
> > ------------------------------------------------------------------------------
> > Start  uncovering the many advantages of virtual appliances
> > and start using them to  simplify application deployment and
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> > _______________________________________________
> > Cppcms-users  mailing list
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> > 
> 
> 
>       
> 
> ------------------------------------------------------------------------------
> Start uncovering the many advantages of virtual appliances
> and start using them to simplify application deployment and
> accelerate your shift to cloud computing.
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