error while including boost libraries - c++

Question

So this is the first time i've done any multi-threading in C++. Right now my code is throwing some kind of error i can't identify but it seems to indicate that it occurs when i include boost/thread.hpp.
The error look something like this.
In file included
from /usr/include/boost/mem_fn.hpp:22:0,
from /usr/include/boost/bind/bind.hpp:26,
from /usr/include/boost/bind.hpp:22,
from /usr/include/boost/thread/detail/thread.hpp:22,
from /usr/include/boost/thread/thread.hpp:22,
from /usr/include/boost/thread.hpp:13,
from processes/Video_process.h:8,
from processes/Video_process.cpp:7:
/usr/include/boost/bind/mem_fn.hpp: In member function ‘R& boost::_mfi::dm<R, T>::operator()(T*) const [with R = void*(void*), T = Video_process]’:
/usr/include/boost/bind/bind.hpp:243:60: instantiated from ‘R boost::_bi::list1<A1>::operator()(boost::_bi::type<R>, F&, A&, long int) [with R = void* (&)(void*), F = boost::_mfi::dm<void*(void*), Video_process>, A = boost::_bi::list0, A1 = boost::_bi::value<Video_process*>]’
/usr/include/boost/bind/bind_template.hpp:20:59: instantiated from ‘boost::_bi::bind_t<R, F, L>::result_type boost::_bi::bind_t<R, F, L>::operator()() [with R = void* (&)(void*), F = boost::_mfi::dm<void*(void*), Video_process>, L = boost::_bi::list1<boost::_bi::value<Video_process*> >, boost::_bi::bind_t<R, F, L>::result_type = void* (&)(void*)]’
/usr/include/boost/thread/detail/thread.hpp:61:17: instantiated from ‘void boost::detail::thread_data<F>::run() [with F = boost::_bi::bind_t<void* (&)(void*), boost::_mfi::dm<void*(void*), Video_process>, boost::_bi::list1<boost::_bi::value<Video_process*> > >]’
processes/Video_process.cpp:240:1: instantiated from here
/usr/include/boost/bind/mem_fn.hpp:342:23: error: invalid use of non-static member function
my codes a bit long so i dont know which bits if any would be useful but here are some anyways...
1.
boost::unique_lock<boost::mutex> lock(mx);
lock.lock();
(...) //stuff
is_data_ready = 1;
lock.unlock();
2.
stserver = boost::shared_ptr<boost::thread>
(new boost::thread(boost::bind(&Video_process::streamServer, this)));
Here is how streamServer is declared in the header
void* streamServer(void* arg);

Answer 1

The error that shows in boost::bind basically says that your member function void* Video_process::streamServer(void* arg) expects two arguments this and void*. Your code only binds the first argument.
If you'd like to use it with boost::thread it shouldn't require the second void* argument or have it bound to a constant. Also, boost::thread discards the return value of the functor, so you may like to use void, i.e.:
struct Video_process {
void streamServer();
};
boost::thread(boost::bind(&Video_process::streamServer, this));
// or simply
boost::thread(&Video_process::streamServer, this);
With regards to:
boost::unique_lock<boost::mutex> lock(mx);
lock.lock();
The first line locks the mutex in the constructor, so the second line with explicit lock is unnecessary.