package lwt
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lwt.unix
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package lwt
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An Exception_filter.t is a value which indicates to Lwt what exceptions to catch and what exceptions to let bubble up all the way out of the main loop immediately.
val handle_all : thandle_all is the default filter. With it the all the exceptions (including Out_of_memory and Stack_overflow) can be handled: caught and transformed into rejected promises.
val handle_all_except_runtime : thandle_all_except_runtime is a filter which lets the OCaml runtime exceptions (Out_of_memory and Stack_overflow) go through all the Lwt abstractions and bubble all the way out of the call to Lwt_main.run.
Note that if you set this handler, then the runtime exceptions leave the Lwt internal state inconsistent. For this reason, you will not be able to call Lwt_main.run again after such an exception has escaped Lwt_main.run.
val set : t -> unitset sets the given exception filter globally. You should call this function at most once during the start of your program, before the first call to Lwt_main.run.