Used to convert signals to exceptions

Will periodically call Thread.delay if set to true

Coq interruption: set the following boolean reference to interrupt Coq (it eventually raises Break, simulating a Ctrl-C)

Use this function as a potential yield function. If interrupt has been set, il will raise Sys.Break.

timeout n f x tries to compute Some (f x), and if it fails to do so before n seconds, returns None instead.

Set a particular timeout function; warning, this is an internal API and it is scheduled to go away.

protect_sigalrm f x computes f x, but if SIGALRM is received during that computation, the signal handler is executed only once the computation is terminated. Otherwise said, it makes the execution of f atomic w.r.t. handling of SIGALRM.

This is useful for example to prevent the implementation of `Timeout` to interrupt I/O routines, generating ill-formed output.