编辑“︁C 语言线程终止”︁（章节）

== 线程终止的方法 ==  

=== 1. 线程函数自然退出 ===  
线程函数执行到<code>return</code>语句时，线程正常终止。  

<syntaxhighlight lang="c">  
#include <pthread.h>  
#include <stdio.h>  

void* thread_function(void* arg) {  
    printf("Thread is running\n");  
    return NULL;  // 线程自然终止  
}  

int main() {  
    pthread_t thread_id;  
    pthread_create(&thread_id, NULL, thread_function, NULL);  
    pthread_join(thread_id, NULL);  
    printf("Thread has terminated\n");  
    return 0;  
}  
</syntaxhighlight>  

'''输出'''：  
<pre>  
Thread is running  
Thread has terminated  
</pre>  

=== 2. 使用 pthread_exit() ===  
<code>pthread_exit</code>允许线程显式退出，并返回一个状态值。  

<syntaxhighlight lang="c">  
void* thread_function(void* arg) {  
    printf("Thread will exit now\n");  
    pthread_exit((void*)42);  // 返回状态值42  
}  

int main() {  
    pthread_t thread_id;  
    void* exit_status;  
    pthread_create(&thread_id, NULL, thread_function, NULL);  
    pthread_join(thread_id, &exit_status);  
    printf("Thread exited with status: %ld\n", (long)exit_status);  
    return 0;  
}  
</syntaxhighlight>  

'''输出'''：  
<pre>  
Thread will exit now  
Thread exited with status: 42  
</pre>  

=== 3. 使用 pthread_cancel() ===  
<code>pthread_cancel</code>允许一个线程请求终止另一个线程。目标线程需设置可取消状态（默认启用）。  

<syntaxhighlight lang="c">  
#include <unistd.h>  

void* thread_function(void* arg) {  
    while (1) {  
        printf("Thread is running...\n");  
        sleep(1);  
    }  
    return NULL;  
}  

int main() {  
    pthread_t thread_id;  
    pthread_create(&thread_id, NULL, thread_function, NULL);  
    sleep(3);  
    pthread_cancel(thread_id);  // 请求终止线程  
    pthread_join(thread_id, NULL);  
    printf("Thread was cancelled\n");  
    return 0;  
}  
</syntaxhighlight>  

'''输出'''：  
<pre>  
Thread is running...  
Thread is running...  
Thread is running...  
Thread was cancelled  
</pre>