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Editorial Team
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Asked: 2026-05-23T07:24:12+00:00

In the iPad app that I’m creating, I’m trying to handle the uncaught Exceptions

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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]

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.

Is this possible?

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1 Answer

  1. Editorial Team

    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.

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

    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

    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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