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# Test that having multiple threads block on stdin doesn't cause any issues.
#
# The test doesn't expect any input on stdin.
#
# This is a regression test for https://github.com/micropython/micropython/issues/15230
# on rp2, but doubles as a general property to test across all ports.
import sys
import _thread
try:
import select
except ImportError:
print("SKIP")
raise SystemExit
class StdinWaiter:
def __init__(self):
self._done = False
def wait_stdin(self, timeout_ms):
poller = select.poll()
poller.register(sys.stdin, select.POLLIN)
poller.poll(timeout_ms)
# Ignoring the poll result as we don't expect any input
self._done = True
def is_done(self):
return self._done
thread_waiter = StdinWaiter()
_thread.start_new_thread(thread_waiter.wait_stdin, (1000,))
StdinWaiter().wait_stdin(1000)
# Spinning here is mostly not necessary but there is some inconsistency waking
# the two threads, especially on CPython CI runners where the thread may not
# have run yet. The actual delay is <20ms but spinning here instead of
# sleep(0.1) means the test can run on MP builds without float support.
while not thread_waiter.is_done():
pass
# The background thread should have completed its wait by now.
print(thread_waiter.is_done())
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