tinn...@isbd.co.uk wrote:
This feels like it should be simple but I can't see a clean way of
doing it at the moment.
I want to retry locking a file for a number of times and then give up,
in pseudo-code it would be something like:-
for N times
try to lock file
if successful break out of for loop
if we don't have a lock then give up and exit
for attempt in range(N):
try:
lock_file_with_timeout(per_try) # change to what you mean
except LockAttemptFailure: # or however the failure is shown
pass # here the attempt+1th try failed.
else:
break # success -- have the lock
else:
raise ImTiredError # however you handle N attempts w/o success
<rest_of_code>
Often it is easiest to stick it in a function:
def retry_lock(tries=3, wait_per_attempt=.5):
for attempt in range(tries):
try:
# change following to whatever you do to attempt a lock.
lock_file_with_timeout(wait_per_attempt)
except LockAttemptFailure: # or however the failure is shown
pass # here the attempt+1th try failed.
else:
return # success -- have the lock
raise ImTiredError
--Scott David Daniels
scott.dani...@acm.org
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