Advice on handling deadlock is incorrect

I have attached a (very) crude example of how to solve the problem of deadlock. People might be concerned with the inefficiency of writing to a file and then reading it again, but for small(few tens of megabytes) this should not really be a problem, certainly not on linux as one can expect the file data to sit in cache, not quite sure about windows. I believe if you are advanced enough to worry about performance you will be able to read and understand select().

Please let me know if I should change something or you need anything else. Reasons to procrastinate are welcome...;]]

tim

Proposed change to line 128 in trunk/lec/integrate.swc : <b1>

<t>Solution is to use a temporary file.</t>

<b2><t>Write your data to a temporary file and use that as input

to the program</t></b2>

<b2><t>This will work fine for "small" data sets, if you want to

use sets of the order of gigabytes please read about <c>select()</c></t></b2> </b1>

An example(adapted freely from a post by Guido some years back) goes like this:

import tempfile tf = tempfile.TemporaryFile?()

try:

tf.write(text) tf.flush() #XXX don't know if this is really needed child = subprocess.Popen(['gzip', '-c'],

stdin=tf, stdout=subprocess.PIPE)

result = child.stdout.read()

finally:

tf.close()