pthread在类中 [英] pthread in a class

问题描述

嘿，大家，考虑下面的代码（编译用 g ++ -lpthread thread_test.cpp ）如何知道我从thread_function内部的数字线程？如果您有任何其他建议，请与我们联络。

Hey everyone, considering the following code (compiled with g++ -lpthread thread_test.cpp) how can I know what number thread I am in from inside "thread_function"? And let me know if you have any other suggestions.

感谢！

thread_test.cpp：

thread_test.cpp:

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <unistd.h>

class A { 
   public:
      A();
      void run();

   private:
      static void* thread_function( void *ptr );
      pthread_t m_thread1, m_thread2;

      static int m_global;
};

int A::m_global = 0;

A::A() {
   int ret1 = pthread_create( &m_thread1, NULL, &A::thread_function, this );
   int ret2 = pthread_create( &m_thread2, NULL, &A::thread_function, this );
}

void A::run() {
   while ( 1 ) { 
      printf( "parent incrementing...\n" );
      m_global++;
      sleep( 2 );
   }   
}

void* A::thread_function( void *ptr ) { 
   printf( "I'm thread ?\n" );

   while ( 1 ) { 
      printf("thread global: %d\n", m_global );
      sleep( 1 );
   }   
}

int main() {
   A a;
   a.run();

   return 0;
}

推荐答案

可以使用pthread_self函数。

You can use pthread_self() function.

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