Multithreading problem.

[Scottas]

I have problems with multithreading. When I do like this:

boost::thread	thread	( boost::bind ( _getfile, remote, local ) );
thread.join	(); 

void	_getfile	( const char *remote, const char *local )
{
	CFTP::ftp_getfile
		ftpfile	=
	{
		local,
		remote,
		NULL
	};
logprintf	( "%s, %s", local, remote );
}

Everything goes right. But when I remove thread.join ( because I don't need to wait ), then I got strange symbols when I output 'local' and 'remote' params in function '_getfile'. Whats wrong with it?

[helios]

Does the context of the boost::thread object resemble this?

{
    std::string string_a,string_b;
    const char *remote,*local;
    remote=string_a.c_str();
    local=string_b.c_str();
    boost::thread thread( boost::bind ( _getfile, remote, local ) );
}

If it does, the problem is that the lifetime of the pointer returned by std::string::c_str() is bound to the lifetime of the std::string object. Since you don't join, the std::strings are free to go out of scope while _getfile() is still running.
The easiest solution is to just pass copies of the strings and let the callee take ownership of them.

[Scottas]

Thanks for answer, but can you give me an example of solution, because I don't know how

[Scottas]

Up