Trait MrbGarbageCollection

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pub trait MrbGarbageCollection {
    // Required methods
    fn create_arena_savepoint(
        &mut self,
    ) -> Result<ArenaIndex<'_>, ArenaSavepointError>;
    fn live_object_count(&mut self) -> usize;
    fn mark_value(&mut self, value: &Value) -> Result<(), Error>;
    fn incremental_gc(&mut self) -> Result<(), Error>;
    fn full_gc(&mut self) -> Result<(), Error>;
    fn enable_gc(&mut self) -> Result<State, Error>;
    fn disable_gc(&mut self) -> Result<State, Error>;
}

Expand description

Garbage collection primitives for an mruby interpreter.

Required Methods§

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fn create_arena_savepoint( &mut self, ) -> Result<ArenaIndex<'_>, ArenaSavepointError>

Create a savepoint in the GC arena.

Savepoints allow mruby to deallocate all the objects created via the C API.

Normally objects created via the C API are marked as permanently alive (“white” GC color) with a call to mrb_gc_protect.

The returned ArenaIndex implements Drop, so it is sufficient to let it go out of scope to ensure objects are eventually collected.

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fn live_object_count(&mut self) -> usize

Retrieve the number of live objects on the interpreter heap.

A live object is reachable via top self, the stack, or the arena.

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fn mark_value(&mut self, value: &Value) -> Result<(), Error>

Mark a Value as reachable in the mruby garbage collector.

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fn incremental_gc(&mut self) -> Result<(), Error>

Perform an incremental garbage collection.

An incremental GC is less computationally expensive than a full GC, but does not guarantee that all dead objects will be reaped. You may wish to use an incremental GC if you are operating with an interpreter in a loop.

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fn full_gc(&mut self) -> Result<(), Error>

Perform a full garbage collection.

A full GC guarantees that all dead objects will be reaped, so it is more expensive than an incremental GC. You may wish to use a full GC if you are memory constrained.

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