Asynchronous exception
An asynchronous exception is an exception delivered independently of the execution point of the computation or thread it interrupts.
Functional Design and Architecture: Examples in Haskell
An asynchronous exception is an exception delivered independently of the execution point of the thread or computation it interrupts.
- How it is used
- Distinguishes unpredictable cross-thread failures from ordinary synchronous exceptions when designing error boundaries.
- How deep it goes
- Defines cross-thread delivery and recommends prohibition plus interpreter-level gatekeeping, without detailing an asynchronous-exception handling procedure.
- Examples
- Uses Haskell threads, native file-system operations, explicit Either-based results, and interpreter exception conversion.
- What you can do after
- Evaluate exception boundaries and design interpreters that keep unpredictable external failures out of business logic.
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Learn Haskell by Example
AsyncException is a Haskell exception type whose constructors represent asynchronous runtime events such as stack overflow, thread termination, and user interruption.
- How it is used
- Handles user interruption and inter-thread control flow during operations such as file copying.
- How deep it goes
- Defines four constructors and demonstrates selective UserInterrupt handling, but does not develop broader asynchronous-exception internals.
- Examples
- Uses Ctrl-C during metadata-preserving file copying and removes the partially copied destination.
- What you can do after
- Apply it via catchJust to select UserInterrupt, clean up partial work, and rethrow the interruption.
Read how Learn Haskell by Example explains asynchronous exception →
Related concepts
- exceptionkind of · An exception is a runtime signal or object representing an abnormal condition that interrupts ordinary program flow and may be handled or propagated.
- asynchronous programmingcontrasts with · Asynchronous programming structures operations so they can proceed or complete without requiring the initiating execution flow to wait for them.
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