thread of C language－逗點大的雨滴

two thread

#include <unistd.h>
#include <sys/types.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <string.h>

void print_message_function ( void *ptr );

typedef struct str_thdata
{
   int thread_no;
   char message[100];
} thdata;

int main()
{
   pthread_t thread1, thread2;
   thdata data1, data2;

   data1.thread_no = 1;
   strcpy(data1.message, "Hello!");

   data2.thread_no = 2;
   strcpy(data2.message, "Hi!");

   pthread_create (&thread1, NULL, (void *) &print_message_function, (void *) &data1);
   pthread_create (&thread2, NULL, (void *) &print_message_function, (void *) &data2);

   pthread_join(thread1, NULL);
   pthread_join(thread2, NULL);

   exit(0);
}

void print_message_function ( void *ptr )
{
   thdata *data;
   data = (thdata *) ptr;

   printf("Thread %d says %s \n", data->thread_no, data->message);

   pthread_exit(0);
}

makefile

thread:thread.o
   cc -o thread thread.o -lpthread

thread.o:thread.c
   cc -c thread.c

clean:
   rm -rf thread *.o