Async::interrupt is a perl module that implements asynchronous interruptions, similar in nature to unix signals, in a cross-platform manner. modules might want to run code asynchronously (in another thread or from a signal handler) and then signal the interpreter on certain events. one common way is to write data to a pipe and use an event handling toolkit to watch for i/o events. another way is to send a signal. those methods are slow, and in the case of a pipe, also not asynchronous - it won't interrupt a running perl interpreter.

this module implements asynchronous notifications that enable you to signal running perl code from another thread, asynchronously, and sometimes even without using a single syscall.