Otp Effect

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Otp Effect

The Otp effect provides the following built-in operations, wired into the VM and runtime.

Operation	Signature	Description
Otp.create_supervisor	create_supervisor(name: String, strategy: Int) -> Int | Nil	Create an OTP supervisor actor and return its id; strategy is 0=one_for_one, 1=one_for_all, 2=rest_for_one, 3=simple_one_for_one (any other value yields nil). Nil no-op outside a runtime.
Otp.supervise_child	supervise_child(sup: Int, child: Actor, policy: Int) -> Nil	Place an existing actor under a supervisor; policy is 0=permanent, 1=temporary, 2=transient (any other value is a no-op). Unknown supervisor ids are nil no-ops.
Otp.set_template	set_template(sup: Int, type_name: String) -> Nil	Set the child template of a simple_one_for_one supervisor to the named actor type, resolved against the performing module’s actor metadata. Unknown types or supervisor ids are nil no-ops.
Otp.start_child	start_child(sup: Int) -> Actor | Nil	Spawn a fresh child from a simple_one_for_one supervisor’s template and supervise it; returns the child actor ref, or nil when the supervisor is unknown, has no template, or is not simple_one_for_one.
Otp.terminate_child	terminate_child(sup: Int, child: Actor) -> Nil	Remove a child from supervision WITHOUT restarting it and exit it cleanly (Normal). Unknown supervisors or children are nil no-ops.
Otp.child_count	child_count(sup: Int) -> Int | Nil	Return the number of currently supervised children, or nil for an unknown supervisor id.

Implementation site: Runtime Host