Concurrency & multiprocessing

X07 intentionally separates:

• deterministic concurrency (for tests and fixture worlds)
• OS multiprocessing (for production parallelism)

Deterministic concurrency (async, single-core)

In fixture worlds, X07’s async system:

• is cooperative (tasks yield at known points)
• runs on a deterministic scheduler
• uses virtual time (ticks) instead of wall-clock time

This enables:

• deterministic pipelines,
• repeatable performance measurements,
• reproducible repair loops.

OS multiprocessing (multi-core)

In OS worlds, X07 can spawn subprocesses:

• the OS schedules them across cores
• policies limit what can be spawned, how many, and resource bounds

This provides a safe default path to “real parallel work” without bringing nondeterminism into the deterministic test substrate.

Guideline:

• Keep core logic testable in fixture worlds.
• Use subprocess adapters at the edge for CPU-parallel work.