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Use support.sleeping_retry() and support.busy_retry() (#93848)

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* Replace time.sleep(0.010) with sleeping_retry() to
  use an exponential sleep.
* support.wait_process(): reuse sleeping_retry().
* _test_eintr: remove unused variables.
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Victor Stinner 2022-06-15 14:09:56 +02:00 • committed by GitHub
parent bddbd80cff
commit 0ba80273f2
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7 changed files with 51 additions and 58 deletions
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14
Lib/test/_test_eintr.py
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@ -403,11 +403,9 @@ class SignalEINTRTest(EINTRBaseTest):
old_mask = signal.pthread_sigmask(signal.SIG_BLOCK, [signum])
self.addCleanup(signal.pthread_sigmask, signal.SIG_UNBLOCK, [signum])
t0 = time.monotonic()
proc = self.subprocess(code)
with kill_on_error(proc):
wait_func(signum)
dt = time.monotonic() - t0
self.assertEqual(proc.wait(), 0)
@ -497,16 +495,18 @@ class FNTLEINTRTest(EINTRBaseTest):
proc = self.subprocess(code)
with kill_on_error(proc):
with open(os_helper.TESTFN, 'wb') as f:
while True: # synchronize the subprocess
dt = time.monotonic() - start_time
if dt > 60.0:
raise Exception("failed to sync child in %.1f sec" % dt)
# synchronize the subprocess
start_time = time.monotonic()
for _ in support.sleeping_retry(60.0, error=False):
try:
lock_func(f, fcntl.LOCK_EX | fcntl.LOCK_NB)
lock_func(f, fcntl.LOCK_UN)
time.sleep(0.01)
except BlockingIOError:
break
else:
dt = time.monotonic() - start_time
raise Exception("failed to sync child in %.1f sec" % dt)
# the child locked the file just a moment ago for 'sleep_time' seconds
# that means that the lock below will block for 'sleep_time' minus some
# potential context switch delay