C语言---多个线程读取文件

#include<pthread.h>#include<stdio.h>#include<stdlib.h>#include<string.h>#include<semaphore.h>#include <unistd.h>#define THREAD_NUM 25typedef struct{    FILE *_fp;    int _nThreadId;//第几个线程    sem_t *_semLock;}IDD_THREAD_PARAM;void *ThreadFunc(void *args){    char sLine[100+1];    FILE *fpRead = ((IDD_THREAD_PARAM *)args)->_fp;    sem_t *semLock = ((IDD_THREAD_PARAM *)args)->_semLock;    int nId = ((IDD_THREAD_PARAM *)args)->_nThreadId;        sem_wait(semLock);    while(!feof(fpRead))    {        memset(sLine,0,sizeof(sLine));        fgets(sLine,100,fpRead);        fprintf(stderr,"Thread ID-%d:%s",nId,sLine);    }    sem_post(semLock);}int main(){    pthread_t *pThreads;    sem_t semLock;    pThreads = (pthread_t *)malloc(THREAD_NUM*sizeof(pthread_t));        sem_init(&semLock,0,1);    FILE *fp = fopen("test.txt","r");    //开始线程循环    IDD_THREAD_PARAM param;    for(int i=0;i<THREAD_NUM;i++)    {        memset(param,0,sizeof(IDD_THREAD_PARAM));        param._fp = fp;        param._nThreadId = i;        param._semLock = &semLock;        pthread_create((pThreads+i),NULL,ThreadFunc,param);    }        for(int i=0;i<THREAD_NUM;i++)        pthread_join(*(pThreads+i),NULL);    free(pThreads);    pThreads = NULL;    fclose(fp);    fp = NULL;    return 0;}