Commit e10d370a authored by Vinay Sajip's avatar Vinay Sajip

Added simple threading example to logging cookbook.

parent f817a48d
...@@ -94,6 +94,61 @@ The output looks like this:: ...@@ -94,6 +94,61 @@ The output looks like this::
2005-03-23 23:47:11,673 - spam_application - INFO - 2005-03-23 23:47:11,673 - spam_application - INFO -
done with auxiliary_module.some_function() done with auxiliary_module.some_function()
Logging from multiple threads
-----------------------------
Logging from multiple threads requires no special effort. The following example
shows logging from the main (initIal) thread and another thread::
import logging
import threading
import time
def worker(arg):
while not arg['stop']:
logging.debug('Hi from myfunc')
time.sleep(0.5)
def main():
logging.basicConfig(level=logging.DEBUG, format='%(relativeCreated)6d %(threadName)s %(message)s')
info = {'stop': False}
thread = threading.Thread(target=worker, args=(info,))
thread.start()
while True:
try:
logging.debug('Hello from main')
time.sleep(0.75)
except KeyboardInterrupt:
info['stop'] = True
break
thread.join()
if __name__ == '__main__':
main()
When run, the script should print something like the following::
0 Thread-1 Hi from myfunc
3 MainThread Hello from main
505 Thread-1 Hi from myfunc
755 MainThread Hello from main
1007 Thread-1 Hi from myfunc
1507 MainThread Hello from main
1508 Thread-1 Hi from myfunc
2010 Thread-1 Hi from myfunc
2258 MainThread Hello from main
2512 Thread-1 Hi from myfunc
3009 MainThread Hello from main
3013 Thread-1 Hi from myfunc
3515 Thread-1 Hi from myfunc
3761 MainThread Hello from main
4017 Thread-1 Hi from myfunc
4513 MainThread Hello from main
4518 Thread-1 Hi from myfunc
This shows the logging output interspersed as one might expect. This approach
works for more threads than shown here, of course.
Multiple handlers and formatters Multiple handlers and formatters
-------------------------------- --------------------------------
......
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