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# Test interruption of select.poll by EINTR signal, when
# MICROPY_PY_SELECT_POSIX_OPTIMISATIONS is enabled.
try:
import time, gc, select, socket, _thread
time.time_ns # Check for time_ns on MicroPython
select.poll # Raises AttributeError for CPython implementations without poll()
except (ImportError, AttributeError):
print("SKIP")
raise SystemExit
# Use a new UDP socket for tests, which should be writable but not readable.
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
localhost_addr_info = socket.getaddrinfo("127.0.0.1", 8000)
try:
s.bind(localhost_addr_info[0][-1])
except OSError:
# Target can't bind to localhost.
# Most likely it doesn't have a NIC and the test cannot be run.
s.close()
print("SKIP")
raise SystemExit
def thread_main():
lock.acquire()
time.sleep(0.2)
print("thread gc start")
# The unix gc.collect() implementation will raise EINTR on other threads.
# Could possibly use _thread._interrupt_main() instead if MicroPython had it.
gc.collect()
print("thread gc end")
# Pre-allocate global variables here so the global dict is not resized by the main
# thread while the secondary thread runs. This is a workaround for the bug described
# in https://github.com/micropython/micropython/pull/11604
poller = None
t0 = None
result = None
dt_ms = None
# Start a thread to interrupt the main thread during its call to poll.
lock = _thread.allocate_lock()
lock.acquire()
_thread.start_new_thread(thread_main, ())
# Create the poller object.
poller = select.poll()
poller.register(s, select.POLLIN)
# Poll on the UDP socket for a set timeout, which should be reached.
print("poll")
lock.release()
t0 = time.time_ns()
result = poller.poll(400)
dt_ms = (time.time_ns() - t0) / 1e6
print("result:", result)
if 380 <= dt_ms <= 600:
print("dt in range")
else:
print("dt not in range:", dt_ms)
# Clean up.
s.close()
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