能帮我找下错误吗

zenglei286

程序源代码
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <ctype.h>
int total_words = 0;

main(int ac , char * av[ ])
{
        pthread_t t1, t2;
        void *test(void *);
        void *count_words(void *);
        if(ac!=3){
                printf("usage: % s file1 file2\n", av[0]);
                exit(1);
        }
        pthread_create(&t1,NULL,test,(void *)av[1]);
        pthread_create(&t1,NULL,test,(void *)av[2]);
        pthread_join(t1, NULL);
        pthread_join(t2, NULL);
        printf("%5d: total words\n", total_words);
}
void *count_words(void *f)
{
        char *filename = (char * )f;
        FILE * fp;
        int c, temp, prevc = '\0';
       
        if((fp = fopen (filename, "r" )) !=NULL)
        {
                while((c = getc(fp))!= EOF)
                {
                  if(!isalnum(c)&& isalnum(prevc))
                        {
                                temp=total_words;
                                sleep(0.1);                          /*延时，使产生脏数据*/
                                total_words=temp+1;
                        }                       
                prevc =c;
                }
        fclose(fp);
        }
        else
                perror(filename);
        return NULL;
}
void *test(void *f)
{
        char *i=(char *)f;
        printf("%s",*i);
}

程序出现了段错误
core dump
Core was generated by `./3 1.txt 2.txt'.
Program terminated with signal 11, Segmentation fault.

warning: Can't read pathname for load map: Input/output error.
Reading symbols from /lib/tls/i686/cmov/libpthread.so.0...done.
Loaded symbols for /lib/tls/i686/cmov/libpthread.so.0
Reading symbols from /lib/tls/i686/cmov/libc.so.6...done.
Loaded symbols for /lib/tls/i686/cmov/libc.so.6
Reading symbols from /lib/ld-linux.so.2...done.
Loaded symbols for /lib/ld-linux.so.2
#0  0xb7e9d27b in strlen () from /lib/tls/i686/cmov/libc.so.6
如果把线程中的执行程序换成了Count_words的话,运行就不会结束,为什么会这样呢

scutan

printf("%s", *i);
-->
printf("%s", i);

hohoxu_hao115

pthread_create(&t1,NULL,test,(void *)av[1]);
         pthread_create(&t1,NULL,test,(void *)av[2]);

这里两个t1。

zenglei286

谢谢大家了,没有想到是这些小错误呀,还以为犯了什么大的错误呢