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Fix ordering of pthread_create(pthread_t *thread)

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This change fixes a bug where signal_latency_async_test would flake less
than 1/1000 of the time. What was happening was pthread_kill(sender_thr)
would return EFAULT. This was because pthread_create() was not returning
the thread object pointer until after clone() had been called. So it was
actually possible for the main thread to stall after calling clone() and
during that time the receiver would launch and receive a signal from the
sender thread, and then fail when it tried to send a pong. I thought I'd
use a barrier at first, in the test, to synchronize thread creation, but
I firmly believe that pthread_create() was to blame and now that's fixed
This commit is contained in:
Justine Tunney 2025-01-03 17:28:39 -08:00
parent ed6d133a27
commit e939659b70
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GPG key ID: BE714B4575D6E328
6 changed files with 57 additions and 63 deletions
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19
tool/scripts/flakes
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@ -6,17 +6,20 @@ import concurrent.futures
from collections import Counter
from typing import List, Dict, Tuple
NUM_PARALLEL = int(os.cpu_count() * 1.5)
NUM_PARALLEL = int(os.cpu_count() * 20)
def find_test_files(root_dir: str) -> List[str]:
def find_test_files(root: str) -> List[str]:
"""Find all executable files ending with _test recursively."""
test_files = []
for root, _, files in os.walk(root_dir):
for file in files:
if file.endswith('_test'):
file_path = os.path.join(root, file)
if os.access(file_path, os.X_OK):
test_files.append(file_path)
if os.path.isdir(root):
for root, _, files in os.walk(root):
for file in files:
if file.endswith('_test'):
file_path = os.path.join(root, file)
if os.access(file_path, os.X_OK):
test_files.append(file_path)
elif root.endswith('_test'):
test_files.append(root)
return test_files
def run_single_test(test_path: str) -> int: