Scieneer Common Lisp 1.3.9 online documentation

unix:unix-signal-synchronization signal[Function]

Return the synchronization of the given signal. The signal should be a valid signal number or a keyword of the standard UNIX signal name. The synchronization which will be either:

A synchronous signal, such as a floating pointer exception, generated by a thread and delivered to the thread generating the signal.
An asynchronous signal delivered to the process. A new thread will be created to handle each asynchronous signal received.