<div dir="ltr">Sometimes, I notice the below errors:<div><div> python call_Test.py</div><div>Traceback (most recent call last):</div><div> File "call_Test.py", line 1, in <module></div><div> from Test_Task import TestTask</div>
<div> File "/cygdrive/d/smoketest/targetflasher/flasher_server/Source/Test_Task.py", line 5, in <module></div><div> import Logging.logQueueHandler as logq</div><div> File "/cygdrive/d/smoketest/targetflasher/flasher_server/Source/Logging/logQueueHandler.py", line 72, in <module></div>
<div> queue = multiprocessing.Queue(-1)</div><div> File "/usr/lib/python2.6/multiprocessing/__init__.py", line 213, in Queue</div><div> return Queue(maxsize)</div><div> File "/usr/lib/python2.6/multiprocessing/queues.py", line 37, in __init__</div>
<div> self._rlock = Lock()</div><div> File "/usr/lib/python2.6/multiprocessing/synchronize.py", line 117, in __init__</div><div> SemLock.__init__(self, SEMAPHORE, 1, 1)</div><div> File "/usr/lib/python2.6/multiprocessing/synchronize.py", line 49, in __init__</div>
<div> sl = self._semlock = _multiprocessing.SemLock(kind, value, maxvalue)</div><div>OSError: [Errno 17] File exists</div></div><div><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, May 2, 2013 at 4:13 PM, Maitrey Mishra <span dir="ltr"><<a href="mailto:maitreymishra23@gmail.com" target="_blank">maitreymishra23@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>I wrote some tests for logging module. I use python 2.6 and use the example as in cookbook</div><div>
file : Test_Task.py</div><div>from threading import Thread</div><div>import Logging.logQueueHandler as logq</div>
<div><br></div><div>class TestTask(threading.Thread):</div><div>def __init__(self):</div><div>pass</div><div><br></div><div>def run(self):</div><div>t = Thread(target=logq.log, args=("ERROR", "Hi"))</div>
<div>t.start()</div><div>q = Thread(target=logq.log, args=("ERROR", "Hello"))</div><div>q.start()</div><div>p = Thread(target=logq.log, args=("ERROR", "How are you?"))</div><div>p.start()</div>
<div>l = Thread(target=logq.log, args=("ERROR", "I am fine, Thank You!"))</div><div>l.start()</div><div>call_test.py</div><div>from Test_Task import TestTask</div><div>import unittest</div><div><br></div>
<div>task = TestTask()</div><div>task.run()</div><div>However, In the log messages I see a number of messages missing.</div><div>With the tests, my aim is to see how logging works with multiple threads.</div></div><div class="HOEnZb">
<div class="h5"><div class="gmail_extra">
<br><br><div class="gmail_quote">On Fri, Apr 26, 2013 at 3:19 PM, Jean-Michel Pichavant <span dir="ltr"><<a href="mailto:jeanmichel@sequans.com" target="_blank">jeanmichel@sequans.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><div style="font-size:12pt;font-family:times new roman,new york,times,serif">Yep that's the one I used.<br><br><hr><div><div><blockquote style="padding-left:5px;font-size:12pt;font-style:normal;margin-left:5px;font-family:Helvetica,Arial,sans-serif;text-decoration:none;font-weight:normal;border-left:2px solid #1010ff">
<div dir="ltr">Ah, <a href="http://plumberjack.blogspot.de/2010/09/using-logging-with-multiprocessing.html" target="_blank">http://plumberjack.blogspot.de/2010/09/using-logging-with-multiprocessing.html</a><div>I use this now, it seems to work!</div>
<div>Thanks!</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, Apr 26, 2013 at 2:16 PM, Maitrey Mishra <span dir="ltr"><<a href="mailto:maitreymishra23@gmail.com" target="_blank">maitreymishra23@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hi All,<div>Thanks for the inputs.</div><div>I use python2.6. It seems to be easier with python3.2 and QueueHandler class.</div>
<div>I pasted the class in my code however I still get the error: AttributeError: 'module' object has no attribute 'QueueHandler'</div>
<div>What changes did you do for adapting to python2.5?</div><div><br></div><div>Thanks!<br>Br,</div><div>Maitrey</div><div><br></div></div><div><div><div class="gmail_extra"><br><br><div class="gmail_quote">
On Thu, Apr 25, 2013 at 4:32 PM, Jean-Michel Pichavant <span dir="ltr"><<a href="mailto:jeanmichel@sequans.com" target="_blank">jeanmichel@sequans.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
----- Original Message -----<br>
> Hi,<br>
><br>
> I need an efficient way of logging using python.<br>
> My problem statemnt:<br>
> 1. I have multiple processes using the same logging file.<br>
> I need solutions to the following:<br>
<div>> a) If multiple processes are trying to write to the same file, I need<br>
</div>> to prevent that. Otherwise, the logging messages will be puzzling to<br>
> the user as he would see logging messages from one module than may<br>
> be some other following it.<br>
><br>
> Please let me know if there is an efficient way to do it.<br>
><br>
> Thanks!<br>
><br>
> Br,<br>
> Maitrey<br>
> --<br>
> <a href="http://mail.python.org/mailman/listinfo/python-list" target="_blank">http://mail.python.org/mailman/listinfo/python-list</a><br>
<br>
Everything you need should be explained here<br>
<a href="http://docs.python.org/release/3.2/howto/logging-cookbook.html#logging-to-a-single-file-from-multiple-processes" target="_blank">http://docs.python.org/release/3.2/howto/logging-cookbook.html#logging-to-a-single-file-from-multiple-processes</a><br>
<br>
Most of the concepts are applicable to any version of python I've done it with python 2.5. I used some Vinay's code posted on the net to implement a logging server, all my processes are logging to that server which is responsible for writing the file.<br>
<br>
JM<br>
<br>
<br>
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