Question

我在执行以下示例程序时遇到分段错误：

#include<iostream>
#include<pthread.h>
#include<string.h>
#include<exception>
#include<stdexcept>
using namespace std;

class ThreadHandler
{
  public:
    int createThread(void (*function)(void*),void* input);
    void setThreadID(int);
    int getThreadID();
    void runThread();
    /* Constructor for ThreadHandler*/
    ThreadHandler();
    virtual ~ThreadHandler();
  protected:
  private:
    int mThreadID;
    pthread_t thread;
};

/* Function: ThreadHandler() */
ThreadHandler::ThreadHandler():mThreadID(0)
{
   cout<<"\n ThreadHandling - constructor"; 
}

/* Function: ~ThreadHandler() */
ThreadHandler::~ThreadHandler()
{
}

/*Function: setThreadID() - set mThreadID value after
  thread creation*/
void ThreadHandler::setThreadID(int thread_id)
{
  cout<<"\n setThreadID function Entry";
  mThreadID=thread_id;
  cout<<"\n Thread ID: "<<mThreadID;
  cout<<"\n setThreadID function Exit";
}

/*Function: getThreadID() - return a thread ID after
  thread creation*/
int ThreadHandler::getThreadID()
{
  return mThreadID;
}

/*Function: createThread() - Create Thread
  and Assign function dynamically */
int ThreadHandler::createThread(void (*callingFunction)(void*),void* input)
{
  cout<<"\n createThread Function Entry";
  int thread_id=pthread_create(&thread,(pthread_attr_t*)callingFunction,NULL,input);
  if(thread_id)
  {
     cout<<"\n Failed to create the thread and throw an exception";
     throw;
  }
  setThreadID(thread_id);
  cout<<"\n createThread Function Exit";
  return thread_id;
}

/* Function: runThread() -- Joinable thread for exection*/
void ThreadHandler::runThread()
{
  cout<<"\n Join the thread for runnable"<<endl;
  pthread_join(this->thread,NULL);
}

/*Function to execute by the thread*/
void ThreadFunction(void* input)
{
   cout<<"\n Thread Execution: "<<input;
}
/*Main part of the Class and Execution*/
int main()
{
   char* msgPtr="I am running";
   ThreadHandler *objThread = new ThreadHandler();
   if(objThread==NULL)
   {
      cout<<"\n Failed to create a ThreadHandler object";
      return -1;
   } 
   /*Create a function pointer to pass*/
   //void* (*FunctionPtr)(void*)=NULL;
   //FunctionPtr = &ThreadFunction;
   try
   {
      cout<<"\n -- start create a thread --";
      objThread->createThread(&ThreadFunction,reinterpret_cast<void*>(msgPtr));
   }
   catch(exception& e)
   {
      cout<<"\n Exception while creating the thread";
   }
   return 0;
}

错误： ThreadHandling - 构造函数 - 开始创建一个帖子 -

编程接收信号SIGSEGV，分段故障。 allocate_stack中的0x00007ffff76aab8c（stack =，pdp =，attr = 0x400ead）在allocatestack.c：415 415 allocatestack.c：没有这样的文件或目录。

Answer 1

<强>问题

您似乎正在以错误的顺序将参数传递给pthread_create。

来自man-pages：

int pthread_create(pthread_t *thread, const pthread_attr_t *attr,
                          void *(*start_routine) (void *), void *arg);

<强>解决方案

改变这个：

pthread_create(&thread,(pthread_attr_t*)callingFunction,NULL,input);

到此：

pthread_create(&thread, NULL, callingFunction, input);

<强>建议

我建议使用std::thread，因为这样可以更轻松地处理线程，尤其是在与std::function结合使用时。

在allocate_stack中（stack = <synthetic pointer =“”>，pdp = <synthetic pointer =“”>

1 个答案: