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Honor per-thread unload delays in app-server (#55270)

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## Why

Thread unload timing used the server-wide delay, ignoring per-thread configuration overrides. Clients need to control how long individual idle, unsubscribed threads remain loaded.

## What changed

- Resolve unload timing from each loaded thread's `thread_unload_delay_secs` configuration. Setting it to `0` allows immediate unloading once the thread has no subscribers or activity.
- Allow this runtime retention override in `experimentalPredictionMode` forks while continuing to reject other configuration overrides. Reject negative values and delays too large to schedule.
- Replace the source-specific immediate-unload behavior with explicit configuration.

## Testing

Extend integration coverage for per-thread delays, unloading after active turns finish, fork overrides, and invalid prediction-fork delays. Verify that immediate unloading preserves persistent history and that cold resumes and ordinary nested forks use their default delay instead of retaining the previous runtime's override.

GitOrigin-RevId: fcb82bd73a101260c51e2a8476f94320c23ac929
This commit is contained in:
jif
2026-10-19 12:30:33 +00:00
committed by copyberry
parent 1b89beea82
commit d28be12577
12 changed files with 157 additions and 31 deletions
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codex-rs/core/src/config/mod.rs
+1 -1
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@@ -1127,7 +1127,7 @@ pub struct Config {
/// Default: `300000` (5 minutes).
pub background_terminal_max_timeout: u64,
/// Idle timeout for unsubscribed app-server threads, resolved at server startup.
/// Idle timeout for unsubscribed app-server threads.
pub thread_unload_delay: Duration,
/// Compatibility-only settings retained for legacy `ghost_snapshot`