后续:执行类的成员函数

Follow-up: Executing a member function of a class

本文关键字：成员 函数 执行 后续      更新时间：2023-10-16

这是我之前在执行类的成员函数中发布的问题的后续。

我正在尝试c++ 1.1线程的一种方式，它接受类的成员函数作为线程构造函数的参数，如下面的第20行标记的第一个代码片段所示。类定义在第二个代码片段中给出。根据之前相关帖子中给出的答案，代码现在编译得很好。但是，现在在第一个代码片段的第20行出现了运行时错误。GDB回溯显示在第三个代码片段中。我是c++的新手，无法正确解释这个错误。你能告诉我怎么了吗?谢谢。

代码片段1:线程初始化(main_app.cpp) 
#include <thread>
#include "ServiceRegistrar.hpp"
#define SERVER_TYPE  100065
#define SERVER_INST_LOWER  1
#define SERVER_INST_UPPER  2
#define TIMEOUT  500000
int main()
{
  ServiceRegistrar sr1(SERVER_TYPE, TIMEOUT, SERVER_INST_LOWER, SERVER_INST_LOWER);
      /*LINE 20 is the following*/
  std::thread t(&ServiceRegistrar::subscribe2TopologyServer, &sr1);
t.join();
  sr1.publishForSRs();
}
代码片段2:类定义 
class ServiceRegistrar
{
  public:
    ServiceRegistrar(int serverType, int serverTimeOut, int serverInstanceLower, int serverInstanceUpper)
       : mServerType(serverType),
         mServerTimeOut(serverTimeOut),
         mServerInstanceLower(serverInstanceLower),
         mServerInstanceUpper(serverInstanceUpper)
         { }
     void subscribe2TopologyServer();
     void publishForSRs();
     void publishForServices();
  private:
     int mServerType;
     int mServerTimeOut;
     int mServerInstanceLower;
         int mServerInstanceUpper;           
  };

代码片段3:GDB backtrace

  (gdb) r
  Starting program: /home/......./src/main_app 
  terminate called after throwing an instance of 'std::system_error'
  what():  Operation not permitted
  Program received signal SIGABRT, Aborted.
  0xb7fdd424 in __kernel_vsyscall ()
  (gdb) bt
  #0  0xb7fdd424 in __kernel_vsyscall ()
  #1  0xb7d471df in raise () from /lib/i386-linux-gnu/libc.so.6
  #2  0xb7d4a825 in abort () from /lib/i386-linux-gnu/libc.so.6
  #3  0xb7f2e8ad in __gnu_cxx::__verbose_terminate_handler() ()
  from /usr/lib/i386-linux-gnu/libstdc++.so.6
  #4  0xb7f2c4f3 in ?? () from /usr/lib/i386-linux-gnu/libstdc++.so.6
  #5  0xb7f2c52f in std::terminate() ()
  from /usr/lib/i386-linux-gnu/libstdc++.so.6
  #6  0xb7f2c7ce in __cxa_throw () from /usr/lib/i386-linux-gnu/libstdc++.so.6
  #7  0xb7f8772e in std::__throw_system_error(int) ()
  from /usr/lib/i386-linux-gnu/libstdc++.so.6
  #8  0xb7f8883c in   std::thread::_M_start_thread(std::shared_ptr<std::thread::_Impl_base>) () from   /usr/lib/i386-linux-gnu/libstdc++.so.6
  #9  0x0804981a in std::thread::thread<void (ServiceRegistrar::*)(),     ServiceRegistrar*>(void (ServiceRegistrar::*&&)(), ServiceRegistrar*&&) (this=0xbffff050, 
  __f=
  @0xbffff058: (void (ServiceRegistrar::*)(ServiceRegistrar * const)) 0x80491d2   <ServiceRegistrar::subscribe2TopologyServer()>)
   at /usr/include/c++/4.7/thread:133
  #10 0x08049526 in main () at main_app.cpp:20

这可能意味着您还没有启用线程支持。尝试将-pthread添加到编译器的命令行参数中(在链接步骤中)。

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