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if __name__ == '__main__':
import eventlet
from eventlet.greenthread import sleep, spawn
eventlet.monkey_patch()
import signal
import os
thread = None
timed_out = False
def on_timeout(signum, frame):
global timed_out
timed_out = True
thread.kill()
def blocking_read(fd):
os.read(fd, 4096)
signal.signal(signal.SIGALRM, on_timeout)
signal.alarm(3)
read_fd, write_fd = os.pipe()
thread = spawn(blocking_read, read_fd)
sleep(0)
assert not timed_out
print('pass')
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