Struct Limits 

pub struct Limits {
    pub fuel: Option<u64>,
    pub deadline: Option<Duration>,
    pub max_host_calls: Option<u64>,
    pub max_call_depth: Option<usize>,
    pub max_tasks: Option<u64>,
}

Limits a host imposes on one run.

A None field imposes nothing: Limits::default() never stops a run.

Fields

fuel: Option<u64>

The total fuel a run may spend before it is stopped.

deadline: Option<Duration>

The wall-clock duration a run may take before it is stopped.

max_host_calls: Option<u64>

The total number of host calls a run may make before it is stopped.

max_call_depth: Option<usize>

The deepest a call may nest before it is stopped.

max_tasks: Option<u64>

The tasks a run may have alive at once before it is stopped.

ADR 0001 lists concurrency limits beside CPU and time, and a thread is the one resource a program can take without asking for it. So this limit is charged where the taking happens: spawn charges it before a thread exists, and a spawn past the limit stops the run rather than waiting for a sibling to finish, because waiting would be a scheduling policy and ADR 0008 has none. Like fuel and host calls, it bounds the run: every task alive anywhere in it counts, so a program cannot stay under the limit by spreading its tasks over more scopes.

Trait Implementations

impl Clone for Limits

fn clone(&self) -> Limits

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Limits

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Limits

fn default() -> Limits

Returns the “default value” for a type.