如何在iPad应用程序中遍历所有活动线程 [英] How To Loop Through All Active Thread in iPad app

问题描述

在我正在创建的iPad应用中，我正在尝试通过输出异常的callStackSymbols来处理未捕获的异常。这可以通过 [NSException callStackSymbols]

In the iPad app that I'm creating, I'm trying to handle the uncaught Exceptions by outputting the callStackSymbols of the exception. This can be done with [NSException callStackSymbols]

完成。但是，我希望能够看到callStackSymbols在所有其他活动线程上也是如此。我知道我可以在任何线程上使用 [NSThread callStackSymbols] ，但我需要遍历所有活动线程才能这样做。

However, I'd like to be able to see the callStackSymbols on all the other active threads as well. I know I can use [NSThread callStackSymbols] on any thread, but I need to loop through all the active threads to do so.

这可能吗？

推荐答案

这是一个复杂的区域，正如Sedate Alien所说。您需要实现自己的堆栈遍历以从其他活动线程中检索堆栈跟踪;诸如backtrace（3）和+ [NSThread callStackSymbols]之类的API只会为当前线程产生一个回溯。

This is a complex area, as Sedate Alien noted. You will need to implement your own stack walking to retrieve a stack trace from the other active threads; APIs such as backtrace(3) and +[NSThread callStackSymbols] will only produce a backtrace for the current thread.

由于我熟悉PLCrashReporter代码，我'我只是用它作为例子：

Since I'm familiar with the PLCrashReporter code, I'll just use it for examples:

• 要获取线程列表，你需要使用 task_threads（）： https://opensource.plausible.coop/ stash / projects / PLCR / repos / plcrashreporter / browse / Source / PLCrashLogWriter.m？at = refs％2Ftags％2F1.0＃694

获得线程列表后，可以通过 thread_get_state（）： https://opensource.plausible.coop/stash/projects/PLCR/repos/plcrashreporter/browse/ Source / PLCrashFrameWalker_arm.c？at = refs％2Ftags％2F1.0＃73

Once you have the thread list, you can fetch the thread state via thread_get_state(): https://opensource.plausible.coop/stash/projects/PLCR/repos/plcrashreporter/browse/Source/PLCrashFrameWalker_arm.c?at=refs%2Ftags%2F1.0#73

使用线程状态，您可以遍历目标的堆栈：
https://opensource.plausible.coop/stash/projects/PLCR/repos/plcrashreporter/browse/Source/PLCrashFrameWalker_arm.c?at=refs%2Ftags%2F1.0#104

Using the thread state, you can walk the target's stack: https://opensource.plausible.coop/stash/projects/PLCR/repos/plcrashreporter/browse/Source/PLCrashFrameWalker_arm.c?at=refs%2Ftags%2F1.0#104

请注意，所有这些代码都有点不寻常，因为它在信号处理程序中执行并被写为异步 - 安全;如果您不熟悉信号处理的复杂性，这是一个很好的起点： http://www.mikeash.com/pyblog/friday-qa-2011-04-01-signal-handling.html

Note that all this code is a bit unusual, as it executes within a signal handler and is written to be async-safe; if you're unfamiliar with the complications around signal handling, this is a good starting point: http://www.mikeash.com/pyblog/friday-qa-2011-04-01-signal-handling.html

正确实施这类事情是一个巨大的麻烦;我真的建议您使用PLCrashReporter或其上构建的产品之一（ QuincyKit ， HockeyApp ， Atlassian JMC 等。

Implementing this kind of thing correctly is a gigantic headache; I would really recommend that you make use of PLCrashReporter, or one of the products built on top of it (QuincyKit, HockeyApp, Atlassian JMC, etc).

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