iphone - 在非当前线程的 IOS 中检索线程名称

Question

如何检索线程的“名称”？

(请参阅应用程序暂停的 xcode 图片，其中我所说的“名称”以黄色突出显示，“com.apple.coremedia.player.async”...我可以检索正在运行的线程，并且尝试了以下，没有运气

mach_msg_type_number_t count, i;
thread_act_array_t list;

task_threads(mach_task_self(), &list, &count);
for (i = 0; i < count; i++) {
    if (list[i] == mach_thread_self()) continue;

    char theName[16];

    memset(theName, 0x00, sizeof(theName));
    pthread_getname_np(list[i], theName);
    printf("The thread name is %s.\n", theName);

}

注意:我不是在询问当前线程的线程名称。我有兴趣从正在运行的线程集中获取线程名称(参见上面的示例)。因此关于 [NSThread currentThread] 的解决方案不会工作

Answer 1

您的问题很简单:task_threads 返回 Mach 端口数组，而不是 pthread_t 数组。在调用 pthread_getname_np 时，您将 Mach 端口视为 pthread_t。但是 Mach 端口不是 pthread_t。您需要使用 pthread_from_mach_thread_np 将每个转换为 pthread_t:

static void dumpThreads(void) {
    char name[256];
    mach_msg_type_number_t count;
    thread_act_array_t list;
    task_threads(mach_task_self(), &list, &count);
    for (int i = 0; i < count; ++i) {
        pthread_t pt = pthread_from_mach_thread_np(list[i]);
        if (pt) {
            name[0] = '\0';
            int rc = pthread_getname_np(pt, name, sizeof name);
            NSLog(@"mach thread %u: getname returned %d: %s", list[i], rc, name);
        } else {
            NSLog(@"mach thread %u: no pthread found", list[i]);
        }
    }
}

我的测试程序的输出:

2013-03-14 03:21:45.908 hole[28315:c07] url connection complete
2013-03-14 03:21:46.787 hole[28315:c07] mach thread 3079: getname returned 0: 
2013-03-14 03:21:46.789 hole[28315:c07] mach thread 6147: getname returned 0: 
2013-03-14 03:21:46.790 hole[28315:c07] mach thread 6915: getname returned 0: 
2013-03-14 03:21:46.792 hole[28315:c07] mach thread 7683: getname returned 0: WebThread
2013-03-14 03:21:46.794 hole[28315:c07] mach thread 13059: getname returned 0: com.apple.NSURLConnectionLoader
2013-03-14 03:21:46.796 hole[28315:c07] mach thread 16131: getname returned 0: 
2013-03-14 03:21:46.798 hole[28315:c07] mach thread 17667: getname returned 0: 
2013-03-14 03:21:46.801 hole[28315:c07] mach thread 18187: getname returned 0: com.apple.CFSocket.private
2013-03-14 03:21:46.802 hole[28315:c07] mach thread 20227: getname returned 0: