thread_test.c

来自「Linux process and thread programming」· C语言 代码 · 共 48 行

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

void *print_message_function( void *ptr );
pthread_mutex_t mutex1 = PTHREAD_MUTEX_INITIALIZER;
int  counter = 0;

main()
{
     pthread_t thread1, thread2;
     char *message1 = "Thread 1";
     char *message2 = "Thread 2";
     int  iret1, iret2;
    
    /* Create independent threads each of which will execute function */

     iret1 = pthread_create( &thread1, NULL, print_message_function,
	  	 	    (void*) message1);
     iret2 = pthread_create( &thread2, NULL, print_message_function, 
			    (void*) message2);

     /* Wait till threads are complete before main continues. Unless we  */
     /* wait we run the risk of executing an exit which will terminate   */
     /* the process and all threads before the threads have completed.   */

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

     printf("Thread 1 returns: %d\n",iret1);
     printf("Thread 2 returns: %d\n",iret2);
     exit(0);
}

void *print_message_function( void *ptr )
{
     char *message;
     message = (char *) ptr;
     pthread_mutex_lock( &mutex1 );
     counter++;
     printf("Counter value: %d,Message: %s\n",counter,message);	
     pthread_mutex_unlock( &mutex1 );


}