I am trying to debug multiple threads.
*** -[NSLock lock]: deadlock (<NSLock: 0xc388ab0> '(null)')
*** Break on _NSLockError() to debug.
How can I debug this?
How can I set a breakpoint on _NSLockError()
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If you're using the Xcode debugger (which uses gdb under the hood), pause the app and in the console enter:
Then the debugger will stop the app when _NSLockError happens, which you should be able to check the backtrace.