I decided to go with one big log file, which will be shared by all
threads (child and parent). A log message Queue is used to store all
log entries, and a customized logger thread will get log entries from
the Queue.
#from the logger thread#
def run(self):
while self.flag == 1: #if the flag is set to 0, the logger
thread should exit
try:
entry = self.q.get()
except Empty:
self.logger.debug('cant find any log entry')
continue
except:
self.logger.error("Unexpected error:", sys.exc_info()
[0])
raise
#do whatever that should be done
self.logger.info("logger thread done") #should see this
message in log file as well
def off(self):
self.logger.info('turning off flag')
self.flag = 0
#in parent thread#
logItemQ.put('We are done, lets stop the logger now.')
time.sleep(1) #it seems that the logger thread cannot exit if
I put a sleep here
myLog.off() #off is called successfully
myLog.join()
I put an off method to turn off a flag so the logger thread knows it
should exit. However, the last log message (the one 'We are done,
lets stop the logger now.') won't be logged if I call myLog.off() and
myLog.join() immediately. So, I put a time.sleep(1) to make sure the
logger thread has enough time to finish it's job. Unfortunately, now
the logger thread simply won't exit, and I don't see the message
'logger thread done'. I can't figure out at which point it hangs,
since I don't any new log entry but the thread simply won't exit.
Am I taking a right approach by using a flag? Should I lock the flag?
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