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# Threads should be semi-cooperative, to the point where one busy
# thread can't starve out another.
#
# (Note on ports without the GIL this one should always be true, on ports with GIL it's
# a test of the GIL behaviour.)
import _thread
import sys
from time import ticks_ms, ticks_diff, sleep_ms
done = False
ITERATIONS = 5
SLEEP_MS = 250
MAX_DELTA = 30
if sys.platform in ("win32", "linux", "darwin"):
# Conventional operating systems get looser timing restrictions
SLEEP_MS = 300
MAX_DELTA = 100
def busy_thread():
while not done:
pass
def test_sleeps():
global done
ok = True
for _ in range(ITERATIONS):
t0 = ticks_ms()
sleep_ms(SLEEP_MS)
t1 = ticks_ms()
d = ticks_diff(t1, t0)
if d < SLEEP_MS - MAX_DELTA or d > SLEEP_MS + MAX_DELTA:
print("Slept too long ", d)
ok = False
print("OK" if ok else "Not OK")
done = True
# make the thread the busy one, and check sleep time on main task
_thread.start_new_thread(busy_thread, ())
test_sleeps()
sleep_ms(100)
done = False
# now swap them
_thread.start_new_thread(test_sleeps, ())
busy_thread()
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