NAME

       Runtime_events.Callbacks - no description

Module

       Module   Runtime_events.Callbacks

Documentation

       Module Callbacks
        : sig end

       type t

       Type of callbacks.

       val  create  : ?runtime_begin:(int -> Runtime_events.Timestamp.t -> Runtime_events.runtime_phase -> unit)
       ->  ?runtime_end:(int  ->  Runtime_events.Timestamp.t  ->  Runtime_events.runtime_phase   ->   unit)   ->
       ?runtime_counter:(int  -> Runtime_events.Timestamp.t -> Runtime_events.runtime_counter -> int -> unit) ->
       ?alloc:(int   ->   Runtime_events.Timestamp.t   ->   int   array   ->   unit)   ->   ?lifecycle:(int   ->
       Runtime_events.Timestamp.t -> Runtime_events.lifecycle -> int option -> unit) -> ?lost_events:(int -> int
       -> unit) -> unit -> t

       Create  a  Callback  that  optionally subscribes to one or more runtime events. The first int supplied to
       callbacks is the ring buffer index.  Each domain owns a single  ring  buffer  for  the  duration  of  the
       domain's  existence.  After  a  domain  terminates, a newly spawned domain may take ownership of the ring
       buffer. A runtime_begin callback is called when the runtime enters a new phase (e.g a runtime_begin  with
       EV_MINOR  is called at the start of a minor GC). A runtime_end callback is called when the runtime leaves
       a certain phase. The runtime_counter callback is called  when  a  counter  is  emitted  by  the  runtime.
       lifecycle  callbacks  are called when the ring undergoes a change in lifecycle and a consumer may need to
       respond.  alloc callbacks are currently only called on the instrumented runtime.   lost_events  callbacks
       are called if the consumer code detects some unconsumed events have been overwritten.

       val   add_user_event   :   'a   Runtime_events.Type.t   ->   (int  ->  Runtime_events.Timestamp.t  ->  'a
       Runtime_events.User.t -> 'a -> unit) -> t -> t

       add_user_event ty callback t extends t to additionally subscribe to user events of type ty . When such an
       event happens, callback is called with the corresponding event and payload.

OCamldoc                                           2025-06-12                       Runtime_events.Callbacks(3o)