# A spawn per iteration creates threads proportional to input size; the OS
# limit arrives before the loop does. The spawn-collect-join idiom (push the
# handle, join after) is still matched - the handles bound the joins, not the
# creation rate - so this stays a warning to justify, not an error.
id: rust-thread-spawn-in-loop
language: rust
severity: error
message: >-
  This spawns an OS thread per iteration. Bound the concurrency: a fixed pool,
  scoped threads over chunks, or async tasks.
files:
  - "**/*.rs"
ignores:
  - "apps/wiki/vendor/**"
  - "safety/oxidized/**"
rule:
  any:
    - pattern: thread::spawn($$$A)
    - pattern: std::thread::spawn($$$A)
  inside:
    any:
      - {kind: for_expression}
      - {kind: while_expression}
      - {kind: loop_expression}
    stopBy: end