Dart Concurrency Complete Guide — Isolates, compute, Streams, and Mutex Patterns
Dart's concurrency model is single-threaded by default, relying on the event loop for asynchronous operations, but uses isolates to achieve true parallelism for CPU-intensive tasks. The compute() function simplifies running one-off computations in a background isolate, while Isolate.spawn() enables long-lived, bidirectional communication with workers. Techniques like TransferableTypedData allow efficient, zero-copy data transfers between isolates, improving performance for large data processing.
- ▪Dart uses a single-threaded event loop model where async/await enables cooperative concurrency but not parallelism.
- ▪The compute() function in Flutter runs a function in a background isolate and is ideal for one-time CPU-heavy tasks like JSON parsing.
- ▪Isolate.spawn() allows persistent bidirectional communication with background workers using SendPort and ReceivePort.
- ▪TransferableTypedData enables zero-copy transfer of large binary data like image pixels between isolates, reducing memory overhead.
- ▪Only serializable data types can be passed between isolates; closures and non-serializable objects like BuildContext are not allowed.
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