linux C++多线程操作文件&输出加锁

下述demo将指定目录下文件存入vector，然后一分为二交给两个线程(threadTask1,threadTask2)去分别处理，对输出函数printDirent加锁防止紊乱。
#include <iostream>
#include <string>
#include <sys/types.h>
#include <dirent.h>
#include <unistd.h>
#include <stdio.h>
#include <fstream>
#include <iomanip>
#include <ctime>
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <unistd.h>
#include <list>
#include <numeric>
#include <algorithm>
#include <vector>

static pthread_mutex_t testlock;
using namespace std;
void *threadTask1(void *ptr);
void *threadTask2(void *ptr);
typedef vector<dirent> VECTORDIRENT;
VECTORDIRENT listDirent;
VECTORDIRENT::iterator iter;
void printStr(string buff);
void printDirent(struct dirent ptrTest);

void *threadTask1(void *ptr)
{
int vectorI=0;
int vectorLen = listDirent.size()/2;
int count=0;
for(;vectorI<vectorLen;vectorI++)
{
printDirent(listDirent[vectorI]);
count++;
}
}

void *threadTask2(void *ptr)
{
int vectorI=listDirent.size()/2;
int vectorLen = listDirent.size();
int count=0;
for(;vectorI<vectorLen;vectorI++)
{
printDirent(listDirent[vectorI]);
count++;
}
}

void printDirent(struct dirent ptrTest){
pthread_mutex_lock(&testlock);
cout<<ptrTest.d_name<<endl;
pthread_mutex_unlock(&testlock);

}

int main(void)
{
DIR *dirTest;
struct dirent *ptrTest;
string testFolderPathName = "/home/undoner/";
dirTest = opendir(testFolderPathName.data()); ///open the dir
int fileCount = 0;
while((ptrTest = readdir(dirTest)) != NULL) ///read the list of this dir
{
if(ptrTest->d_type==8){
listDirent.push_back(*ptrTest);
}
}
cout<<listDirent.size()<< endl;
cout<<"listDirent.begin()--- listDirent.end():"<<endl;
for (iter = listDirent.begin(); iter != listDirent.end(); ++iter) {
cout << iter->d_name << " ";
}
pthread_t thread1,thread2;
int ret1,ret2;
ret1=pthread_create(&thread1,NULL,threadTask1,NULL);
ret2=pthread_create(&thread2,NULL,threadTask2,NULL);
//ret3=pthread_create(&thread3,NULL,thread,NULL);
if(ret1!=0){
printf ("Create pthread error!\n");
exit (1);
}
if(ret2!=0){
printf ("Create pthread error!\n");
exit (1);
}
pthread_join(thread1,NULL);
pthread_join(thread2,NULL);
return 0;
}