Two changes to improve code coverage in deterministic simulation testing:
1. Add 3 chunk servers (was 1) to match the replication factor
- This enables testing of chunk replication and chunk-to-chunk
server communication code paths in chunk_server.c
- Covers: process_chunk_server_download_*, start_download,
download_targets_* functions
2. Fix Quakey bug where events targeting a closed descriptor caused
assertion failures
- Added remove_events_targeting_desc() to clean up DISCONNECT and
DATA events when a descriptor is freed
- Modified desc_free() to accept Sim pointer and call cleanup
- This was exposed by running multiple chunk servers which create
more connection activity
Three related issues were causing the simulation to get stuck:
1. Network events (connect, disconnect, send_data) were scheduled with
relative times instead of absolute times, causing events to be
scheduled in the past once simulation time exceeded 10-100ms.
2. When DATA events couldn't be fully consumed (receiver buffer full),
they stayed at their original time, preventing time from advancing.
Now they are rescheduled to current_time + 10ms.
3. When poll_timeout was 0, WAKEUP events were created at current_time,
causing an infinite loop where time never advanced. Now timeout=0
sets timedout immediately without creating an event.
cozis
Claude