#include <stdio.h> #include <stdlib.h> #include <pthread.h> #define NUM_THREADS 5 void *thread_func(void *thread_id) { long tid; tid = (long) thread_id; printf("Thread %ld is running\n", tid); // 创建一个新的线程 pthread_t sub_thread; int rc; rc = pthread_create(&sub_thread, NULL, thread_func, (void *) (tid + 1)); if (rc) { printf("Error: return code from pthread_create() is %d\n", rc); exit(-1); } pthread_exit(NULL); } int main(int argc, char *argv[]) { pthread_t threads[NUM_THREADS]; int rc; long t; for (t = 0; t < NUM_THREADS; t++) { printf("Creating thread %ld\n", t); rc = pthread_create(&threads[t], NULL, thread_func, (void *) t); if (rc) { printf("Error: return code from pthread_create() is %d\n", rc); exit(-1); } } // 等待所有线程结束 for (t = 0; t < NUM_THREADS; t++) { pthread_join(threads[t], NULL); } pthread_exit(NULL); }如何在第二个子线程里天机算法

您可以将您的算法代码放在`thread_func`函数中。在您创建新的子线程时，将`thread_func`作为参数传递给`pthread_create`函数，就可以在新的子线程中运行您的算法。以下是修改后的代码示例：

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

#define NUM_THREADS 5

void *thread_func(void *thread_id) {
    long tid;
    tid = (long) thread_id;
    printf("Thread %ld is running\n", tid);
    
    // 在第二个子线程中添加算法
    if (tid == 2) {
        printf("Running algorithm in thread %ld\n", tid);
        // 这里是您的算法代码
        // ...
    }

    // 创建一个新的子线程
    pthread_t sub_thread;
    int rc;
    rc = pthread_create(&sub_thread, NULL, thread_func, (void *) (tid + 1));
    if (rc) {
        printf("Error: return code from pthread_create() is %d\n", rc);
        exit(-1);
    }

    pthread_exit(NULL);
}

int main(int argc, char *argv[]) {
    pthread_t threads[NUM_THREADS];
    int rc;
    long t;
    for (t = 0; t < NUM_THREADS; t++) {
        printf("Creating thread %ld\n", t);
        rc = pthread_create(&threads[t], NULL, thread_func, (void *) t);
        if (rc) {
            printf("Error: return code from pthread_create() is %d\n", rc);
            exit(-1);
        }
    }

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

    pthread_exit(NULL);
}

在函数`thread_func`中，当`tid`等于2时，您可以在该线程中运行您的算法。如果您需要访问共享资源，请考虑线程安全问题。