- the module-help subprocess is read as UTF-8 under a cp1252 locale
- the yfinance cache check names the suite's directory, which may sit under the home on Windows
- POSIX file modes and shell upgrade commands are checked only off Windows
- file locking names errno.EDEADLK, which macOS also defines
- a settlement pass holds the log's settlement lock, so runs sharing a log never pay for the same reflection twice; only outcomes actually written count as settled, and a run's Memory Log step does not wait for another run's pass
- each outcome is written when its reflection is done, so an interrupted pass keeps what it finished
- any failure to price a decision is reported as a failed settlement, not taken for a window that has yet to trade
- storing a decision and settling outcomes hold a lock across the read, change and write, so runs sharing a log no longer drop each other's entries
- files.locked takes the lock on a .lock file beside the log, across threads and processes
- the OHLCV cache and the SEC EDGAR cache go through dataflows.files.replace_file: a reader sees the old file or the new one, and concurrent writers never share a temp file
Yijia-Xiao