69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
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#include <stdio.h>
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#include <pthread.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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int global_data;
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void clean(void *data) // 清理函数的耗时属于调用线程
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{
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printf("开始清理数据: %p\n", data);
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global_data = *((int *)data);
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free(data);
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}
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void *task(void *data)
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{
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int n = atoi((char *)data);
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int *total = malloc(4);
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pthread_cleanup_push(clean, total);
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for (int i = 1; i <= n; i++)
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{
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*total += i;
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usleep(200 * 1000);
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}
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pthread_cleanup_pop(1);
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pthread_exit(NULL); // 加入清理函数后，但数据的退出无意义
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}
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typedef struct delay_cancel_info
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{
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pthread_t tid;
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int delay;
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} DELAY_INFO;
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void *delay_cancel(void *data)
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{
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DELAY_INFO *info = (DELAY_INFO *)data;
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sleep(info->delay);
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printf("%ld 线程即将取消\n", info->tid);
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pthread_cancel(info->tid);
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}
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int main(int argc, char const *argv[])
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{
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if (argc != 3)
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{
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printf("usage: %s number delay_time\n", argv[0]);
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return 0;
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}
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pthread_t tid;
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pthread_create(&tid, NULL, task, (void *)argv[1]);
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DELAY_INFO info = {tid, atoi(argv[2])};
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pthread_t tid2;
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pthread_create(&tid2, NULL, delay_cancel, &info);
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if (pthread_join(tid, NULL) == 0)
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{
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printf("%ld 子线程返回数据: %d\n", tid, global_data);
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}
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return 0;
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}
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/*
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【小结】在线程加入的清理函数时，原线程中的pthread_exit()则不能正常返回数据。因此，在清理函数内，将当前堆的数据赋值给全局变量，在主线程中进行使用。
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*/
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