{"record":{"id":"6ad617b5076cef23","repo":"Hmbown/CodeWhale","slug":"runtime-turn-operation-is-already-being-claimed-retry","errorCode":null,"errorMessage":"Runtime turn operation is already being claimed; retry","messagePattern":"Runtime turn operation is already being claimed; retry","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"warning","filePath":"crates/tui/src/runtime_threads.rs","lineNumber":1958,"sourceCode":"        let mut claim =\n            fd_lock::RwLock::new(self.open_turn_operation_claim_lock(operation_key_fingerprint)?);\n        let _guard = self.acquire_turn_operation_claim(&mut claim)?;\n        operation()\n    }\n\n    fn acquire_turn_operation_claim<'a>(\n        &self,\n        claim: &'a mut fd_lock::RwLock<File>,\n    ) -> Result<fd_lock::RwLockWriteGuard<'a, File>> {\n        match claim.try_write() {\n            Ok(guard) => Ok(guard),\n            Err(error)\n                if matches!(\n                    error.kind(),\n                    std::io::ErrorKind::WouldBlock | std::io::ErrorKind::Interrupted\n                ) =>\n            {\n                bail!(\"Runtime turn operation is already being claimed; retry\")\n            }\n            Err(error) => Err(error).context(\"Failed to claim Runtime turn operation\"),\n        }\n    }\n\n    /// Remove a binding left before its turn record by a process crash.\n    ///\n    /// Bindings are committed before turns, while engine submission happens\n    /// only after both are durable. A binding with no turn therefore never\n    /// reached the engine and is safe to discard during startup recovery.\n    fn recover_incomplete_turn_operations(&self) -> Result<()> {\n        let operations_dir = checked_existing_runtime_store_dir(&self.turn_operations_dir)?;\n        for entry in fs::read_dir(&operations_dir)\n            .with_context(|| format!(\"Failed to read {}\", operations_dir.display()))?\n        {\n            let path = entry?.path();\n            if path.extension().is_none_or(|extension| extension != \"json\") {\n                continue;","sourceCodeStart":1940,"sourceCodeEnd":1976,"githubUrl":"https://github.com/Hmbown/CodeWhale/blob/73e0f67d83c59909b571efdfc88c4bc28c309cb1/crates/tui/src/runtime_threads.rs#L1940-L1976","documentation":"Claiming an exclusive runtime turn operation uses a lock file created with create_new semantics. If the create fails with WouldBlock or Interrupted, another process or thread already holds the claim, so this caller is told to retry later. Any other io::Error is wrapped as a generic claim failure.","triggerScenarios":"Two processes (or two TUI instances sharing the same runtime store) call the turn-claim API concurrently; one wins the create_new, the other gets WouldBlock/Interrupted and hits this bail.","commonSituations":"Running multiple codewhale CLI/TUI instances against the same session directory; a stale lock held by a still-running process; concurrent tooling (scripts) poking the store while the UI runs.","solutions":["Wait briefly and retry the operation; the claim is transient and held by another live caller.","Close the other TUI/CLI process currently using the same runtime store.","Verify only one instance is pointed at the same session/store directory.","If the lock is stale (owning process is gone), remove the leftover binding file and retry."],"exampleFix":"// before: one-shot claim panics on contention\nlet claim = store.claim_turn_op(key)?;\n\n// after: bounded retry loop\nlet claim = loop {\n    match store.claim_turn_op(key) {\n        Ok(c) => break c,\n        Err(e) if e.to_string().contains(\"already being claimed\") => {\n            tokio::time::sleep(Duration::from_millis(50)).await;\n        }\n        Err(e) => return Err(e),\n    }\n};","handlingStrategy":"retry","validationCode":"// No pre-call check possible; contention is detected by the claim attempt itself.\n// Optionally check an existing binding before claiming:\nif store.peek_turn_binding(key)?.is_some() {\n    eprintln!(\"turn operation already claimed\");\n}","typeGuard":null,"tryCatchPattern":"match store.claim_turn_op(key) {\n    Ok(c) => c,\n    Err(e) if e.to_string().contains(\"already being claimed\") => {\n        tokio::time::sleep(Duration::from_millis(100)).await;\n        store.claim_turn_op(key)?\n    }\n    Err(e) => return Err(e),\n}","preventionTips":["Run only one TUI/CLI instance per runtime store directory.","Wrap claims in bounded retry with backoff.","Clean up stale bindings after detecting a dead owner (pid/liveness check)."],"tags":["concurrency","locking","retryable"],"backgroundTag":"resource-already-in-use","analyzedSha":"73e0f67d83c59909b571efdfc88c4bc28c309cb1","analyzedAt":"2026-09-22T01:30:00.501Z","contentChangedAt":"2026-09-22T01:30:00.501Z","schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}