contextimpl(boost::function<void()> fn){

contextfn = fn;

pFiber = CreateFiber(1024 * 64, contextimpl::contextFiberProc, this);

}

~contextimpl(){

DeleteFiber(pFiber);

}

#ifdef _WINDOWS

static VOID CALLBACK contextFiberProc(_In_ PVOID lpParameter){

contextimpl * ct = static_cast<contextimpl*>(lpParameter);

if (!ct->contextfn.empty()){

ct->contextfn();

}

}

#endif

#ifdef _WINDOWS

LPVOID pFiber;

#endif

boost::function<void()> contextfn;

#ifdef _WINDOWS

contextimpl * _contextimpl = new contextimpl(fn);

#endif

return _contextimpl->pFiber;

#ifdef _WINDOWS

SwitchToFiber(ct);

#endif