#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>
 
// ฟังก์ชันสำหรับสร้าง thread
void *threadFunc(void *arg) {
    int thread_id = *((int *)arg); // รับค่า id ของ thread
 
    // แสดงผลลัพธ์การทำงานของแต่ละ thread
    printf("Thread %d is running...\n", thread_id);
 
    // รอสักพักเพื่อทำให้ thread ทำงานอยู่เป็นเวลาหนึ่ง
    sleep(5);
 
    printf("Thread %d is done.\n", thread_id);
 
    return NULL; // สิ้นสุดการทำงานของ thread
}
 
int main() {
    int choice;
    int thread_id = 0;
    pthread_t tid;
 
    while (1) {
        // แสดงเมนูให้ผู้ใช้เลือก
        printf("\nMenu:\n");
        printf("1. Run thread 1\n");
        printf("2. Run thread 2\n");
        printf("3. Run thread 3\n");
        printf("4. Exit\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);
 
        if (choice == 4) {
            printf("Exiting program...\n");
            break;
        }
 
        // สร้าง thread ใหม่เมื่อผู้ใช้เลือกเมนูที่ 1, 2, หรือ 3
        if (choice >= 1 && choice <= 3) {
            thread_id++;
            printf("Creating thread %d...\n", thread_id);
            pthread_create(&tid, NULL, threadFunc, &thread_id);
            pthread_join(tid, NULL); // รอให้ thread ทำงานเสร็จสิ้นก่อนที่จะดำเนินการต่อ
        } else {
            printf("Invalid choice. Please enter again.\n");
        }
    }
 
    return 0;
}

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NA==

4