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90 lines
2.7 KiB
Python
90 lines
2.7 KiB
Python
"""Tests for tools.daemon_pool.DaemonThreadPoolExecutor.
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The daemon pool exists so abandoned workers (interrupted/timed-out tool
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batches, wedged memory-provider syncs) can never block interpreter exit:
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stdlib ThreadPoolExecutor workers are non-daemon AND registered in
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concurrent.futures.thread._threads_queues, whose atexit hook joins every
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worker unconditionally — even after shutdown(wait=False).
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"""
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import subprocess
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import sys
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import threading
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import time
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from concurrent.futures.thread import _threads_queues
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from tools.daemon_pool import DaemonThreadPoolExecutor
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def test_workers_are_daemon_threads():
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pool = DaemonThreadPoolExecutor(max_workers=2)
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try:
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info = pool.submit(
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lambda: (threading.current_thread().daemon, threading.current_thread())
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).result(timeout=10)
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is_daemon, worker = info
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assert is_daemon is True
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# Not registered with concurrent.futures' atexit join hook.
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assert worker not in _threads_queues
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finally:
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pool.shutdown(wait=True)
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def test_results_and_initializer_work_like_stdlib():
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seen = []
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def _init(tag):
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seen.append(tag)
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pool = DaemonThreadPoolExecutor(max_workers=1, initializer=_init, initargs=("t",))
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try:
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assert pool.submit(lambda: 41 + 1).result(timeout=10) == 42
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assert seen == ["t"]
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finally:
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pool.shutdown(wait=True)
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def test_idle_worker_reuse():
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pool = DaemonThreadPoolExecutor(max_workers=4)
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try:
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tid1 = pool.submit(threading.get_ident).result(timeout=10)
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time.sleep(0.05) # let the worker park on the idle semaphore
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tid2 = pool.submit(threading.get_ident).result(timeout=10)
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assert tid1 == tid2
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finally:
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pool.shutdown(wait=True)
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def test_wedged_worker_does_not_block_interpreter_exit():
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"""A worker stuck in a long sleep must not hold the process open.
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With stdlib ThreadPoolExecutor this subprocess hangs until the sleep
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finishes (the atexit hook joins the worker); with the daemon pool it
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exits as soon as the main thread returns.
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"""
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script = (
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"import sys; sys.path.insert(0, %r)\n"
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"from tools.daemon_pool import DaemonThreadPoolExecutor\n"
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"import time\n"
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"pool = DaemonThreadPoolExecutor(max_workers=1)\n"
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"pool.submit(time.sleep, 120)\n"
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"time.sleep(0.3)\n"
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"pool.shutdown(wait=False)\n"
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"print('main-done', flush=True)\n"
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) % (str(_repo_root()),)
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proc = subprocess.run(
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[sys.executable, "-c", script],
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capture_output=True,
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text=True,
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timeout=30,
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)
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assert proc.returncode == 0
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assert "main-done" in proc.stdout
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def _repo_root():
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import pathlib
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return pathlib.Path(__file__).resolve().parents[2]
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