forked from retoor/devplacepy
retoor
9cfaddfc40
The creation and run quotas were checked and then acted on, so two concurrent create_task calls or two schedulers could both pass the check and overshoot the limit. Both are now a single conditional INSERT decided on the driver rowcount: reserve_run takes a run slot after the claim and releases the claim by deferring when the quota is spent, and insert_task_within_quota does the same for the task row itself. Racing twelve and sixteen processes now yields exactly the limit. The atomic insert names its columns, and dataset skips a None valued key when it creates a table lazily, so the store declares the full task column set up front. Both the column and index ensures now tolerate a concurrent duplicate, since several processes build a store at once and SQLite DDL is not idempotent. Adds the quota, task-run context, guard, store and scheduler test suites, and documents the chokepoints and the unhackable task-run flag.