用户态线程与内核态线程

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

void print_msg(char *ptr);

int main()
{
 pthread_t thread1, thread2;
 int i,j; 
 void *retval;
 char *msg1="Hello/n";
 char *msg2="World/n";
 pthread_create(&thread1,NULL, (void *)(&print_msg), (void *)msg1);
 pthread_create(&thread2,NULL, (void *)(&print_msg), (void *)msg2);
 pthread_join(thread1,&retval);
 pthread_join(thread2,&retval);
 return 0;
}

void  print_msg(char *ptr)
{
 int i;
 for(i=0;i<10000;i++) 
   printf("%s",ptr);
}