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Process & I/O — index

Three small libraries that handle process introspection, cross-process file locking, and filesystem-change notifications. All have iOS-sandbox considerations. Each now has its own page — this file is just a table of contents.

Per-library docs

Library Version What it does Doc
psutil 5.9.8 (iOS shim) process + system info; iOS sandbox limits what's visible psutil.md
filelock 3.28.0 cross-process file locking; on iOS becomes a process-wide mutex filelock.md
watchdog 4.0.0 filesystem change notifications; on iOS falls back to PollingObserver watchdog.md

Pairing them

A common pattern: poll a downloaded-models directory, take the lock when loading a new model, log thread state via psutil:

import os, time, psutil, threading
from watchdog.observers.polling import PollingObserver
from watchdog.events import FileSystemEventHandler
from filelock import FileLock

MODELS_DIR = os.path.expanduser("~/Documents/models")
LOCK = FileLock(MODELS_DIR + "/.load.lock", timeout=30)

class LoadOnNew(FileSystemEventHandler):
    def on_created(self, event):
        if not event.src_path.endswith(".pte"):
            return
        with LOCK:
            print(f"[t={threading.get_ident()}] loading {event.src_path}")
            # ... pretend-load ...
            time.sleep(2)
            print(f"  loaded; rss={psutil.Process().memory_info().rss/1024**2:.0f}MiB")

obs = PollingObserver(timeout=2.0)
obs.schedule(LoadOnNew(), MODELS_DIR, recursive=False)
obs.start()

See also