mt.c

sun 给出的源程序,可用sunstudio或gcc编译.

#include <stdio.h>       /* standard I/O routines                 */
#include <pthread.h>     /* pthread functions and data structures */
#include <strings.h>
#include <stdlib.h>
#include <unistd.h>

void* do_computing(void *data)
{
	int j,sum;
	j=*((int *)data);
	for(sum=0;j<=100;j++){
		sum=sum+j;
	}
	printf("Sum is %d\n",sum);
	pthread_exit(0);
}

void* do_leak(void *data)
{
	int i;
	char *p;

	for(i=0;i<20;i++){
		if(i==16){
			p=(char*)malloc(20*sizeof(char));
			if(p==NULL)
				exit(-1);
			else{
				memset(p,0,20);
				strcpy(p,"Hello Sun Studio");	
				printf("%s\n",p);
			}
		}
	}
	pthread_exit(0);
}

int
main(int argc, char* argv[])
{
    int        num;
    int        thr_id1;        /* thread ID for the first new thread    */
    int        thr_id2;        /* thread ID for the second new thread   */
    pthread_t  p_thread1;      /* first thread's structure              */
    pthread_t  p_thread2;      /* second thread's structure             */

    num=1;
    /* create a new thread that will execute 'do_computing()'*/
    thr_id1 = pthread_create(&p_thread1, NULL, do_computing, (void*)&num);
    /* create a second thread that will execute 'do_leak()'  */
    thr_id2 = pthread_create(&p_thread2, NULL, do_leak, NULL);

    pthread_join(p_thread1,NULL);
    pthread_join(p_thread2,NULL);
    return 0;
}