进一步有进一步惊喜

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

volatile int th_num = 10;
volatile int sum = 0;
pthread_mutex_t lock;
void *add_th(void *arg){
    int in_arg = *(int *)arg;
    pthread_t tid;
    tid = pthread_self();
    for(int i=0;i<2000;i++){
        // 使用锁
        pthread_mutex_lock(&lock);
        sum += 1;
        pthread_mutex_unlock(&lock);
    }
    printf("thread arg = %d\n",in_arg);
    printf("thread id = %lu\n",tid);
    th_num --;
    return NULL;
}
int main() {
    pthread_t handle;
    int re = -1;
    for (int i = th_num;i>0;i--){
//        使用原有的i
//        int *arg = &i;

//        新建变量
        int *arg = malloc(sizeof(int));
        *arg = i;
//
//        int d = i;
//        int *arg = &d;
        re = pthread_create(&handle,NULL,add_th,arg);
        if(re == 0){
            printf("创建线程成功\n");
        }else {
            printf("创建线程失败，code %d\n",re);
        }
    }
    while (th_num > 0){
        printf("查询线程是否已经退出,th_num : %d\n",th_num);
        sleep(1);
    }
    printf("sum = %d\n",sum);
    return 0;
}

#include <process.h>

void th_testThread(void *arg) {
    // 线程处理
    int *data = (int *)arg;
}

int main(int argc, char *argv[]) {
    int data = 2;
    _beginthread(th_testThread, 0, &data);

    // 主线程处理
}