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Notes on signal handling |
Before deciding to deal with signals in your application, please consider the following:
throw
are unsafe. Handlers defined to call a predicate are safe. Note that the
predicate can call throw/1,
but the delivery is delayed until Prolog is in a safe state.
The C-interface described in section
12.4.17 provides the option
PL_SIGSYNC
to select either safe synchronous or unsafe
asynchronous delivery.
throw
or a foreign handler, signals are delivered
immediately (as defined by the OS). When using a Prolog predicate,
delivery is delayed to a safe moment. Blocking system calls or foreign
loops may cause long delays. Foreign code can improve on that by calling PL_handle_signals().
Signals are blocked when the garbage collector is active.