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I checked what's new in Xcode 9 documentation and I found this
But i didn't understand what is that how I can use this with new Xcode 9.
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The Main Thread Checker (MTC) is a runtime tool that throws a warning when system API calls that should be made on the main thread, such as UI operations, are incorrectly called on a background thread.
The Thread Sanitizer, also known as TSan, is an LLVM based tool to audit threading issues in your Swift and C language written code. It was first introduced in Xcode 8 and can be a great tool to find less visible bugs in your code, like data races.
When an application component starts and the application does not have any other components running, the Android system starts a new Linux process for the application with a single thread of execution. By default, all components of the same application run in the same process and thread (called the "main" thread).
Threads are especially useful when you need to perform a lengthy task, but don't want it to block the execution of the rest of the application. In particular, you can use threads to avoid blocking the main thread of the application, which handles user interface and event-related actions.
It can be enabled/disabled in the diagnostics option of the scheme. Besides, the "Pause on issues" is a comfortable option to debug these problems.
Xcode 11
Xcode <11
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