Re: [Boost-users] Asio io_service::work destructor throwing mutex exception

Subject: Re: [Boost-users] Asio io_service::work destructor throwing mutex exception
From: Boris Schaeling (boris_at_[hidden])
Date: 2009-12-13 09:21:41

On Sat, 12 Dec 2009 23:48:57 +0100, Florian Turck <mail_at_[hidden]>  
wrote:

> I am using asio´s io_service::work class to prevent io_service.run()
> from returning. Unfortunatly on deletion of my object the destructor of
> io_service::work throws an exception:
>
> terminate called after throwing an instance of
> 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::system::system_error>
>> '
>   what():  mutex: Invalid argument

I always use a dynamically allocated work object and store it in a  
scoped_ptr. This works fine (I've changed your code below). However I  
don't remember having read in the Boost.Asio documentation that your  
approach is wrong. But I don't remember either where I got this idea with  
the dynamically allocated object from.

> [...]
> private:
>
> 	io_service ioService;
> 	io_service::work ioWork;

boost::scoped_ptr<io_service::work> ioWork;

> [...]
> MyClass() : ioService(),
> 		ioWork(ioService),

ioWork(new io_service::work(ioService)),

> [...]
> if (connected)
> 	disconnect();

ioWork.reset();

> ioService.stop();
> ioThread.join();
> [...]

HTH,
Boris