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Understanding Parallel Programming: Thread Management for Beginners
- In this fourth part of the series Understanding Parallel Programming: A Guide for Beginners, the author discusses Thread management, Thread execution flags, and Thread priority management tool.
- Thread management involves managing the execution and stopping it for which the article provides code snippets. The catch though is that a Thread cannot be stopped; it can only be given an order to stop and needs to be coded accordingly.
- Thread execution flags indicate the state of the thread. There are three flags namely – isExecuting, isCancelled, and isFinished. The developer must track isCancelled and stop the thread if it is true. isFinished flag indicates whether the thread has completed its execution.
- Thread priority management, on the other hand, enables us to prioritise certain threads based on their resource needs. It helps manage threads based on their resource demands and optimise the usage and prevent UI lags.
- The article also emphasises that merely adding more threads doesn’t always resolve performance issues. Even with hundreds of threads, you're still limited by the device's resources.
- Lastly, Run Loop, by default, is only present in the main thread and not automatically available in any other threads you create. It is essential for managing asynchronous code, timers, and some notifications like Realm, as they may not work properly in secondary threads.
- The author provides several code snippets demonstrating how to work with RunLoop in Threads. Understanding the concepts and the examples provided is essential for efficient multithreading in iOS applications.
- The article concludes with a mention that in the next part of the series, the author will discuss Grand Central Dispatch library (GCD) that simplifies thread management.
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