pub trait MrbGarbageCollection {
    fn create_arena_savepoint(
        &mut self
    ) -> Result<ArenaIndex<'_>, ArenaSavepointError>; fn live_object_count(&mut self) -> i32; 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) -> i32

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

Enable garbage collection.

Returns the prior GC enabled state.

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

Disable garbage collection.

Returns the prior GC enabled state.

Implementors§