linux怎么创建线程数

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

// 线程执行的函数
void* thread_function(void* arg) {
    printf("Hello from thread %ld
", (long)arg);
    return NULL;
}

int main() {
    pthread_t threads[5]; // 创建线程数组
    int rc;
    long t;

    // 创建5个线程
    for(t = 0; t < 5; t++) {
        printf("In main: creating thread %ld
", t);
        rc = pthread_create(&threads[t], NULL, thread_function, (void*)t);
        if (rc) {
            printf("ERROR: return code from pthread_create() is %d
", rc);
            exit(-1);
        }
    }

    // 等待所有线程结束
    for(t = 0; t < 5; t++) {
        pthread_join(threads[t], NULL);
    }

    pthread_exit(NULL);
}