iphoneobjective-ccocoa-touchmultithreadingnslock

How can I set a breakpoint on _NSLockError()

I am trying to debug multiple threads. 

 *** -[NSLock lock]: deadlock (<NSLock: 0xc388ab0> '(null)')
 *** Break on _NSLockError() to debug.

How can I debug this?

Solution

  • If you're using the Xcode debugger (which uses gdb under the hood), pause the app and in the console enter:

    b _NSLockError

    Then the debugger will stop the app when _NSLockError happens, which you should be able to check the backtrace.