Enum fidl_fuchsia_starnix_device::SyncFenceRegistryRequest

pub enum SyncFenceRegistryRequest {
    CreateSyncFences {
        num_fences: u32,
        responder: SyncFenceRegistryCreateSyncFencesResponder,
    },
    RegisterSignaledEvent {
        fence_key: SyncFenceKey,
        event: Event,
        control_handle: SyncFenceRegistryControlHandle,
    },
}

This protocol is used to create Linux compatible fences for Fuchsia.

This protocol is “closed”, but for this protocol we don’t require cross-version source or ABI compatibility.

The registry service guarantees that the timestamp of event signal operations are accurately recorded. The timestamps are only available inside Starnix.

Any errors in methods result in channel closure.

Variants

CreateSyncFences

Batch create SyncFences. There is one-to-one correspondance between sync_fence_keys and events. Each event is treated as the first synchronization object that is backing a SyncFence. There may be other events added later through SYNC_IOC_MERGE ioctl.

Lifetime of SyncFence is defined by how long the client holds SyncFenceKey.

Fields

num_fences: u32

responder: SyncFenceRegistryCreateSyncFencesResponder

RegisterSignaledEvent

Registers an event for this SyncFenceKey. This event is expected to be signaled iff all the underlying events associated with this SyncFence are signaled.

If fence_key is not found in the registry of created SyncFenceKeys or dropped, event is signaled immediately.

Fields

fence_key: SyncFenceKey

event: Event

control_handle: SyncFenceRegistryControlHandle

Implementations

impl SyncFenceRegistryRequest

pub fn into_create_sync_fences( self ) -> Option<(u32, SyncFenceRegistryCreateSyncFencesResponder)>

pub fn into_register_signaled_event( self ) -> Option<(SyncFenceKey, Event, SyncFenceRegistryControlHandle)>

pub fn method_name(&self) -> &'static str

Name of the method defined in FIDL

Trait Implementations

impl Debug for SyncFenceRegistryRequest

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

Formats the value using the given formatter.