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365fe0b3d5
Fixes #2665. Regenerated by tabbott with `lint --fix` after a rebase and change in parameters. Note from tabbott: In a few cases, this converts technical debt in the form of unsorted imports into different technical debt in the form of our largest files having very long, ugly import sequences at the start. I expect this change will increase pressure for us to split those files, which isn't a bad thing. Signed-off-by: Anders Kaseorg <anders@zulip.com>
75 lines
2.0 KiB
Python
75 lines
2.0 KiB
Python
import errno
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import os
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import pty
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import sys
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from typing import Callable, Dict, Iterable, Iterator, Tuple, TypeVar
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JobData = TypeVar('JobData')
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def run_parallel(job: Callable[[JobData], int],
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data: Iterable[JobData],
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threads: int=6) -> Iterator[Tuple[int, JobData]]:
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pids: Dict[int, JobData] = {}
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def wait_for_one() -> Tuple[int, JobData]:
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while True:
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try:
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(pid, status) = os.wait()
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return status, pids.pop(pid)
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except KeyError:
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pass
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for item in data:
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pid = os.fork()
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if pid == 0:
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sys.stdin.close()
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try:
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os.close(pty.STDIN_FILENO)
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except OSError as e:
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if e.errno != errno.EBADF:
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raise
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sys.stdin = open("/dev/null")
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os._exit(job(item))
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pids[pid] = item
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threads = threads - 1
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if threads == 0:
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(status, item) = wait_for_one()
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threads += 1
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yield (status, item)
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if status != 0:
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# Stop if any error occurred
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break
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while True:
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try:
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(status, item) = wait_for_one()
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yield (status, item)
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except OSError as e:
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if e.errno == errno.ECHILD:
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break
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else:
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raise
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if __name__ == "__main__":
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# run some unit tests
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import time
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jobs = [10, 19, 18, 6, 14, 12, 8, 2, 1, 13, 3, 17, 9, 11, 5, 16, 7, 15, 4]
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expected_output = [6, 10, 12, 2, 1, 14, 8, 3, 18, 19, 5, 9, 13, 11, 4, 7, 17, 16, 15]
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def wait_and_print(x: int) -> int:
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time.sleep(x * 0.1)
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return 0
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output = []
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for (status, job) in run_parallel(wait_and_print, jobs):
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output.append(job)
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if output == expected_output:
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print("Successfully passed test!")
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else:
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print("Failed test!")
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print(jobs)
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print(expected_output)
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print(output)
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