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import pytest
import sys, os, subprocess
CODE = """
import sys, os, _thread, time
fd1, fd2 = os.pipe()
f1 = os.fdopen(fd1, 'rb', 0)
f2 = os.fdopen(fd2, 'wb', 0)
def f():
print("thread started")
x = f1.read(1)
assert x == b"X"
print("thread exit")
_thread.start_new_thread(f, ())
time.sleep(0.5)
if os.fork() == 0: # in the child
time.sleep(0.5)
x = f1.read(1)
assert x == b"Y"
print("ok!")
sys.exit()
f2.write(b"X") # in the parent
f2.write(b"Y") # in the parent
time.sleep(1.0)
"""
@pytest.mark.skipif("not getattr(os, 'fork', None)")
def test_thread_fork_file_lock():
output = subprocess.check_output([sys.executable, '-u', '-c', CODE])
assert output.splitlines() == [
b'thread started',
b'thread exit',
b'ok!']
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