如何将类成员函数与该类的对象绑定以通过pthreads创建线程？

Question

如何将类成员函数（不带输入参数）与类的对象绑定，以便可以使用绑定的函数通过pthreads创建线程？

#include <tr1/functional> 
    using std::tr1::bind; 
using namespace std::tr1::placeholders; 


Server server(port_number); 
Server* serverPtr; 
serverPtr = &server; 

pthread_t my_thread = makeThread(bind(&lab1::Server::Run), serverPtr); 

pthread_t makeThread(ThreadBody body) { 

ThreadBody* copy = new ThreadBody(body); 

void* arg = reinterpret_cast<void*>(copy); 
pthread_t thread; 
if (pthread_create(&thread, NULL, threadFunction, arg) != 0) { 
perror("Can't create thread"); 
delete copy; 
exit(1); 
} 
return thread; 
} 

我得到了编译错误：

我不知道这是什么错误表示。

 
/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../include/c++/4.1.2/tr1/functional_iterate.h: In instantiation of âstd::tr1::_Result_of_implâ: 
/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../include/c++/4.1.2/tr1/functional:126: instantiated from âstd::tr1::result_ofâ 
/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../include/c++/4.1.2/tr1/bind_iterate.h:44: instantiated from âstd::tr1::_Bindâ 
lab2.cpp:80: instantiated from here 
/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../include/c++/4.1.2/tr1/functional_iterate.h:106: error: âintâ is not a class, struct, or union type 
/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../include/c++/4.1.2/tr1/functional_iterate.h: In instantiation of âstd::tr1::_Result_of_implâ: 
/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../include/c++/4.1.2/tr1/functional:126: instantiated from âstd::tr1::result_ofâ 
/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../include/c++/4.1.2/tr1/bind_iterate.h:55: instantiated from âstd::tr1::_Bindâ 
lab2.cpp:80: instantiated from here 
/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../include/c++/4.1.2/tr1/functional_iterate.h:106: error: âconst intâ is not a class, struct, or union type 
/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../include/c++/4.1.2/tr1/functional_iterate.h: In instantiation of âstd::tr1::_Result_of_implâ: 
/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../include/c++/4.1.2/tr1/functional:126: instantiated from âstd::tr1::result_ofâ 
/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../include/c++/4.1.2/tr1/bind_iterate.h:66: instantiated from âstd::tr1::_Bindâ 
lab2.cpp:80: instantiated from here 
/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../include/c++/4.1.2/tr1/functional_iterate.h:106: error: âvolatile intâ is not a class, struct, or union type 
/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../include/c++/4.1.2/tr1/functional_iterate.h: In instantiation of âstd::tr1::_Result_of_implâ: 
/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../include/c++/4.1.2/tr1/functional:126: instantiated from âstd::tr1::result_ofâ 
/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../include/c++/4.1.2/tr1/bind_iterate.h:77: instantiated from âstd::tr1::_Bindâ 
lab2.cpp:80: instantiated from here 
/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../include/c++/4.1.2/tr1/functional_iterate.h:106: error: âconst volatile intâ is not a class, struct, or union type 
lab2.cpp: In constructor âlab1::Server::Server(int)â: 
lab2.cpp:80: error: could not convert âstd::tr1::bind [with _Functor = int, _T1 = sockaddr*, _T2 = long unsigned int](((lab1::Server*)this)->lab1::Server::listen_fd_, ((sockaddr*)(& server_endpoint)), 16ul)â to âboolâ 
thread.hpp: In function âint main(int, char**)â: 
thread.hpp:34: error: too many arguments to function âpthread_t base::makeThread(base::ThreadBody)â 
lab2.cpp:229: error: at this point in file 
/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../include/c++/4.1.2/tr1/bind_iterate.h: In member function âtypename std::tr1::result_of::type std::tr1::_Bind:perator()() [with _Functor = std::tr1::_Mem_fn]â: 
/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../include/c++/4.1.2/tr1/functional_iterate.h:502: instantiated from âstatic void std::tr1::_Function_handler::_M_invoke(const std::tr1::_Any_data&) [with _Functor = std::tr1::_Bind()()>]â 
/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../include/c++/4.1.2/tr1/functional_iterate.h:850: instantiated from âstd::tr1::function::function(_Functor, typename std::__enable_if::_Useless, (! std::tr1::is_integral::value)>::__type) [with _Functor = std::tr1::_Bind()()>, _Res = void]â 
lab2.cpp:229: instantiated from here 
/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../include/c++/4.1.2/tr1/bind_iterate.h:45: error: no match for call to â(std::tr1::_Mem_fn)()â 
/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../include/c++/4.1.2/tr1/functional_iterate.h:207: note: candidates are: _Res std::tr1::_Mem_fn:perator()(_Class&) const [with _Res = void, _Class = lab1::Server] 
/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../include/c++/4.1.2/tr1/functional_iterate.h:213: note: _Res std::tr1::_Mem_fn:perator()(_Class*) const [with _Res = void, _Class = lab1::Server] 
/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../include/c++/4.1.2/tr1/bind_iterate.h:45: error: return-statement with a value, in function returning 'void' 
make: *** [lab2_server] Error 1 

Answer 1

你应该使用绑定这样

bind(&lab1::Server::Run, serverPtr); 

但我认为在pthread_create不接受bind返回function。 您可以在服务器中编写静态帮助器方法，并使用arg参数。

class Server 
{ 
    static void RunWrapper(void* server) 
    { 
    Server* s = static_cast<Server*>(server); 
    s->Run(); 
    } 
}; 


Server* myServer = CreateServer(); 
pthread_create(&thread, NULL, &Server::RunWrapper, myServer);