Struct SharedBuf 

pub struct SharedBuf { /* private fields */ }

A borrowed view of the host’s shared-data buffer for the current call, or none (in which case shared access falls back to the slot model).

The type is not Send/Sync (a NonNull field), matching the single-threaded virtual machine. It owns no memory; the host owns the buffer and outlives the borrow.

Implementations

impl SharedBuf

pub fn new() -> Self

An inactive buffer. Shared access uses the slot model until set is called with a non-empty buffer.

pub fn set(&mut self, buf: &mut [u8])

Capture the host buffer for the current call.

An empty slice is treated as “no buffer”: the buffer goes inactive and the caller routes shared access to the slot model. This is the coexistence path for hosts that drive the virtual machine through the plain call/resume and populate shared slots through set_data.

pub fn clear(&mut self)

Release the borrowed buffer. The virtual machine calls this before the call_with_shared/resume_with_shared entry point returns, so a stale pointer is never observable.

pub fn is_active(&self) -> bool

Whether a host buffer is currently borrowed.

pub fn bytes(&self) -> Option<&[u8]>

The borrowed buffer as a shared slice, or None when inactive.

pub fn bytes_mut(&mut self) -> Option<&mut [u8]>

The borrowed buffer as a mutable slice, or None when inactive.

Trait Implementations

impl Default for SharedBuf

fn default() -> Self

Returns the “default value” for a type.