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import gc
import linecache
from textwrap import dedent
import weakref
def test_linecache_race():
# Test that checkcache is resilient to possible race conditions
# gh-5109
def gen_func(n):
func_code = dedent("""
def func():
pass
""")
g = {}
exec(func_code, g, g)
func = g['func']
filename = f"<generated-{n}>"
linecache.cache[filename] = (len(func_code), None, func_code.splitlines(True), filename)
def cleanup_linecache(filename):
def _cleanup():
if filename in linecache.cache:
del linecache.cache[filename]
return _cleanup
weakref.finalize(func, cleanup_linecache(filename))
return func
# Unpatched, this required about 6000 iterations to fail
for n in range(10_000):
func = gen_func(n)
del func
linecache.checkcache()
if n % 1000 == 0:
# print(f"{n:5}")
pass
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