[Tutor] cgi.FieldStorage() causing thread.error: can't allocate lock

[Peter Otten]

Alan Gauld wrote:

> On 23/05/14 12:57, SABARWAL, SHAL wrote:
>> Wondering if anyone came across this error in using form =
>> cgi.FieldStorage()
>>
>> import tempfile
>>
>>                      File /tempfile.py", line 83, in <module> _once_lock
>> = _allocate_lock()
>>
>>                          thread.error: can't allocate lock
>>
>> puthon version 2.7, on HP-UX 11.11
> 
> Since we can't see the code in tempfile.py we could ony guess
> Also please include the full error traceback, that looks like
> you have summarised it.
> 
> As it stands it is impossible to tell how tempfile.py relates to
> cgi.FieldStorage() or even if the error is related to that
> at all.

Here's what the cgi.FieldStorage.make_file() method looks like

    def make_file(self, binary=None):
        # docstring omitted
        import tempfile
        return tempfile.TemporaryFile("w+b")

and importing from within a method is generally a bad idea when threads are 
involved. However, I'm unable to provoke the error the OP is seeing.

Shal, does the error occur every time or sporadically? Can you provide code 
to reproduce the error?