线程的创建pthread_create.c

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

void *pthread_fun(void *arg)
{
  int b;
  b = *(int *)arg;
  printf("b = %d \n",b);
  int i = 5 ;
  while(i > 0)
   {
     printf("pthread start \n");
     sleep(1);
     i -- ;
   }
}
int main()
{
     pthread_t pthread;
     int a =10;
#if 0 
     if (pthread_create(&pthread,NULL,pthread_fun,NULL) < 0)
      {
          perror("fail to pthread_create");
          exit(1);
      }
#endif
#if 1
    if (pthread_create(&pthread,NULL,pthread_fun,&a) < 0)
    {
       perror("fail to pthread_create");
       exit(1);
    }
#endif
    printf("pthread create success\n");
    pthread_join(pthread,NULL);//等待线程的退出
    printf("pthread exit \n");
    return 0;
}