Mac / iPhone：有没有办法在不使用Objective-C的情况下获取线程标识符？ [英] Mac/iPhone: Is there a way to get a thread identifier without using Objective-C?

问题描述

有没有办法获得当前正在运行的线程的任何类型的线程标识符，而无需求助于Objective-C的NSThread。

Is there a way to get any kind of thread identifier of the currently running thread without resorting to Objective-C's NSThread.

我正在改进我们的自定义调试跟踪系统正确处理多个线程。对于每行跟踪输出，我想打印一个线程ID或一个线程名称。线程以各种方式实例化，例如，使用NSOperationQueue和pthread函数。

I'm improving our custom debug tracing system to handle multiple threads properly. For each line of trace output, I'd like to print a thread id or a thread name. Threads are instantiated in various ways, e.g. both NSOperationQueue and pthread functions are used.

我目前有以下两种选择，但我对其中任何一种都不满意。还有其他选择吗？

I've currently a following two alternatives, but I'm not satisfied with either of them. Are there any other options?

pthread_t选项

pthread_t 似乎是特定平台 _opaque_pthread_h 的typedef。现在可以使用 _opaque_pthread_h 的字段，即使它是hack-y而且不可移植。它有一个long类型的 __ sig 字段，但是对于我的进程的所有线程，它似乎具有相同的值。

pthread_t seems to be a typedef of a platform specific _opaque_pthread_h. It would be ok to use fields of _opaque_pthread_h for now, even if it's hack-y and not portable. It has a __sig field of type long, but that seems to have a same value for all threads of my process.

NSThread选项

[NSThread name] 需要 NSAutoreleasePool ，但我不希望这是一个要求，因为我们的大部分代码都是纯C ++，所以它会是很高兴只是在没有自动释放池包装的情况下启动c ++函数。

[NSThread name] requires NSAutoreleasePool to be in place, but I don't want that to be a requirement as most of our code is pure C++, so it would be nice to just to launch c++ function without autorelease pool wrapping.

推荐答案

我找到了一种足以获得跟踪输出的唯一标识符的方法。

I found a one way that is enough to get some kind of unique identifier for trace output.

pthread_mach_thread_np 可用于获取线程标识符，iPhone上的unsigned int。

pthread_mach_thread_np can be used to get a thread identifier, an unsigned int on iPhone.

mach_port_t tid = pthread_mach_thread_np(pthread_self());

显然，这是NSLog输出中使用的相同线程ID。

Apparently this is a same thread id that is used in NSLog output.

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