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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,221 @@ | ||
| use codex_protocol::ThreadId; | ||
| use std::collections::HashMap; | ||
| use std::collections::HashSet; | ||
| use std::sync::Arc; | ||
| use std::sync::Mutex; | ||
|
|
||
| #[derive(Default)] | ||
| pub(crate) struct ThreadActivityGate { | ||
| state: Mutex<ThreadActivityState>, | ||
| } | ||
|
|
||
| #[derive(Default)] | ||
| struct ThreadActivityState { | ||
| next_generation: u64, | ||
| nodes: HashMap<ThreadId, ThreadActivityNode>, | ||
| } | ||
|
|
||
| struct ThreadActivityNode { | ||
| generation: u64, | ||
| // A lineage edge follows the stable logical thread ID across runtime generations. | ||
| parent_thread_id: Option<ThreadId>, | ||
| active: usize, | ||
| closing: bool, | ||
| handle_live: bool, | ||
| initializing: bool, | ||
| } | ||
|
|
||
| #[derive(Debug, thiserror::Error)] | ||
| #[error("thread or ancestor is shutting down")] | ||
| pub(crate) struct ThreadActivityRegistrationError; | ||
|
|
||
| pub(crate) struct ThreadActivityHandle { | ||
| gate: Arc<ThreadActivityGate>, | ||
| thread_id: ThreadId, | ||
| generation: u64, | ||
| } | ||
|
|
||
| impl ThreadActivityGate { | ||
| pub(crate) fn register( | ||
| self: &Arc<Self>, | ||
| thread_id: ThreadId, | ||
| parent_thread_id: Option<ThreadId>, | ||
| ) -> Result<ThreadActivityHandle, ThreadActivityRegistrationError> { | ||
| let mut state = self | ||
| .state | ||
| .lock() | ||
| .unwrap_or_else(std::sync::PoisonError::into_inner); | ||
|
|
||
| if state | ||
| .nodes | ||
| .get(&thread_id) | ||
| .is_some_and(|node| !node.closing || node.active > 0) | ||
| || parent_thread_id.is_some_and(|parent_thread_id| { | ||
| Self::ancestor_blocks_registration(&state, parent_thread_id, thread_id) | ||
| }) | ||
| || Self::has_active_descendant(&state, thread_id) | ||
| { | ||
| return Err(ThreadActivityRegistrationError); | ||
| } | ||
|
|
||
| state.next_generation = state.next_generation.wrapping_add(1); | ||
| let generation = state.next_generation; | ||
| state.nodes.insert( | ||
| thread_id, | ||
| ThreadActivityNode { | ||
| generation, | ||
| parent_thread_id, | ||
| active: 1, | ||
| closing: false, | ||
| handle_live: true, | ||
| initializing: true, | ||
| }, | ||
| ); | ||
| Ok(ThreadActivityHandle { | ||
| gate: Arc::clone(self), | ||
| thread_id, | ||
| generation, | ||
| }) | ||
| } | ||
|
|
||
| fn ancestor_blocks_registration( | ||
| state: &ThreadActivityState, | ||
| mut ancestor_id: ThreadId, | ||
| descendant_id: ThreadId, | ||
| ) -> bool { | ||
| let mut visited = HashSet::new(); | ||
| while visited.insert(ancestor_id) { | ||
| if ancestor_id == descendant_id { | ||
| return true; | ||
| } | ||
| let Some(node) = state.nodes.get(&ancestor_id) else { | ||
| return false; | ||
| }; | ||
| if node.closing { | ||
| return true; | ||
| } | ||
| let Some(parent_thread_id) = node.parent_thread_id else { | ||
| return false; | ||
| }; | ||
| ancestor_id = parent_thread_id; | ||
| } | ||
| true | ||
| } | ||
|
|
||
| fn has_active_descendant(state: &ThreadActivityState, ancestor_id: ThreadId) -> bool { | ||
| state.nodes.iter().any(|(thread_id, node)| { | ||
| if *thread_id == ancestor_id || node.active == 0 { | ||
| return false; | ||
| } | ||
| let mut parent_thread_id = node.parent_thread_id; | ||
| let mut visited = HashSet::new(); | ||
| while let Some(parent_id) = parent_thread_id | ||
| && visited.insert(parent_id) | ||
| { | ||
| if parent_id == ancestor_id { | ||
| return true; | ||
| } | ||
| parent_thread_id = state | ||
| .nodes | ||
| .get(&parent_id) | ||
| .and_then(|node| node.parent_thread_id); | ||
| } | ||
| false | ||
| }) | ||
| } | ||
|
|
||
| fn mark_closed(&self, thread_id: ThreadId, generation: u64) { | ||
| let mut state = self | ||
| .state | ||
| .lock() | ||
| .unwrap_or_else(std::sync::PoisonError::into_inner); | ||
| let Some(node) = state.nodes.get_mut(&thread_id) else { | ||
| return; | ||
| }; | ||
| if node.generation == generation { | ||
| node.closing = true; | ||
| } | ||
| } | ||
|
|
||
| fn mark_initialized(&self, thread_id: ThreadId, generation: u64) { | ||
| let mut state = self | ||
| .state | ||
| .lock() | ||
| .unwrap_or_else(std::sync::PoisonError::into_inner); | ||
| let Some(node) = state.nodes.get_mut(&thread_id) else { | ||
| return; | ||
| }; | ||
| if node.generation == generation && node.initializing { | ||
| node.initializing = false; | ||
| node.active = node.active.saturating_sub(1); | ||
| } | ||
| } | ||
|
|
||
| fn prune_inactive_orphaned( | ||
| state: &mut ThreadActivityState, | ||
| mut thread_id: ThreadId, | ||
| mut generation: u64, | ||
| ) { | ||
| loop { | ||
| let has_children = state | ||
| .nodes | ||
| .values() | ||
| .any(|node| node.parent_thread_id == Some(thread_id)); | ||
| let Some(node) = state.nodes.get(&thread_id) else { | ||
| return; | ||
| }; | ||
| if node.generation != generation || node.handle_live || node.active != 0 || has_children | ||
| { | ||
| return; | ||
| } | ||
| let parent_thread_id = node.parent_thread_id; | ||
| state.nodes.remove(&thread_id); | ||
| let Some(parent_id) = parent_thread_id else { | ||
| return; | ||
| }; | ||
| let Some(parent) = state.nodes.get(&parent_id) else { | ||
| return; | ||
| }; | ||
| thread_id = parent_id; | ||
| generation = parent.generation; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl ThreadActivityHandle { | ||
| pub(crate) fn mark_initialized(&self) { | ||
| self.gate.mark_initialized(self.thread_id, self.generation); | ||
| } | ||
|
|
||
| pub(crate) fn mark_closed(&self) { | ||
| self.gate.mark_closed(self.thread_id, self.generation); | ||
| } | ||
| } | ||
|
|
||
| impl Drop for ThreadActivityHandle { | ||
| fn drop(&mut self) { | ||
| let mut state = self | ||
| .gate | ||
| .state | ||
| .lock() | ||
| .unwrap_or_else(std::sync::PoisonError::into_inner); | ||
| let Some(node) = state.nodes.get_mut(&self.thread_id) else { | ||
| return; | ||
| }; | ||
| if node.generation == self.generation { | ||
| node.handle_live = false; | ||
| node.active = 0; | ||
| node.closing = true; | ||
| node.initializing = false; | ||
| ThreadActivityGate::prune_inactive_orphaned( | ||
| &mut state, | ||
| self.thread_id, | ||
| self.generation, | ||
| ); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| #[cfg(test)] | ||
| #[path = "thread_activity_tests.rs"] | ||
| mod tests; |
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