Thanks for the suggestion. Although it seems like it should work, it
does not, it returns the wrong PID. I tried it. In the following
example, the correct PID to kill is '3', but subprocess.Popen.pid
(a.k.a. server.pid) returns '2'. Here is a shortened example:
import sys
import subprocess
from PySide.QtCore import *
from PySide.QtGui import *
from PySide.QtWebKit import *
# Create a Qt application
app = QApplication(sys.argv)
pids = pm.get_python_pids()
print "PID list 1:"
print pids
## Assuming no other Python things are running,
## this prints a list of one PID, e.g. ['1']
# Start the Django server
server = subprocess.Popen(["python", manage_path, "runserver"])
pids_1 = pm.get_python_pids()
print "PID list 2:"
print pids_1
## Prints a list of two PIDs, e.g. ['1', '2']
# Enter Qt application main loop
app.exec_()
# If execution reaches this point, then the GUI window was closed
# To kill the Django server, we must first figure out what
# its Windows PID is
pids_2 = pm.get_python_pids()
print "PID list 3:"
print pids_2
## Prints a list of three PIDs, e.g. ['1', '2', '3']
## The proper process to kill is whichever one is new in pids_2. That is to
## say, we should kill the process which is listed in pids_2 but is not
## present in pids_1. In this example, it would be PID '3'.
## Another idea to find the PID to kill:
print "Server PID:"
print server.pid
## This doesn't work. In the current example, this prints '2'.
## '2' is not the correct PID to kill, the correct PID
## is '3' in this example.
# max_kill is the maximum number of processes named 'python.exe' to kill
max_kill = 1
for pid in pids_2:
if pid in pids_1:
continue
else:
subprocess.call(["taskkill", "/F", "/pid", pid])
max_kill -= 1
if max_kill == 0:
break
# Now exit Python entirely
sys.exit()
Trying to kill the Django server in this way is equivalent to
server.kill() or server.terminate() or server.send_signal(CTRL_C_EVENT).
The problem with those three is the same: they send the signal to PID
'2', which is simply not the PID of the Django server. It is the PID
bound to the Popen instance, but that is not correct.
Zak F.
On 9/7/12 4:33 AM, João Vale wrote:
Hi,
I think you're overcomplicating things when looking up Django's PID,
the object returned by Popen already provides you that:
http://docs.python.org/library/subprocess.html#subprocess.Popen.pid
Cheers,
João
On Thu, Sep 6, 2012 at 6:18 PM, Zak <[email protected]
<mailto:[email protected]>> wrote:
To see my full solution, look at the code below. Here it is
described in
English:
Use the Windows command 'tasklist' to get a list of all running
processes. Unfortunately, several processes are named simply
'python.exe', and I could not find a way to figure out which one
corresponded to manage.py. If you kill the wrong 'python.exe'
process, a
process may essentially kill itself. If the process kills itself
before
it kills manage.py, then manage.py will not be killed at all.
To solve this problem, I ran 'tasklist' several times and kept
track of
when new processes appeared and which PID they had. It turns out that
three 'python.exe' processes are created, and you need to kill the
third
one.
I eventually kill the process using 'taskkill /F /pid %s' %
(pid_to_kill).
Here is the code, simplified and merged into a single file:
import re
import subprocess
pyPat = re.compile("(?m)^python\.exe\s+(?P<pid>\d+)")
# pyPat matches if "python.exe" occurs at the start of a new line
(not in
# the middle), followed by one or more spaces, followed by one or more
# digits. The digits are stored in the 'pid' group of the match
object.
def get_python_pids():
tasklist = subprocess.check_output(["tasklist"])
pids = []
for mtch in pyPat.finditer(tasklist):
pids.append(mtch.group('pid'))
return pids
import sys
import subprocess
from PySide.QtCore import *
from PySide.QtGui import *
from PySide.QtWebKit import *
# Create a Qt application
app = QApplication(sys.argv)
# Create a browser window and show it
browser = QWebView(None)
browser.load(QUrl("http://127.0.0.1:8000/";))
browser.show()
# pids = pm.get_python_pids()
# print "PID list 1:"
# print pids
## Assuming no other Python things are running,
## this prints a list of one PID, e.g. ['1']
# Start the Django server
manage_path = local_settings.root_dir + 'manage.py'
server = subprocess.Popen(["python", manage_path, "runserver"])
pids_1 = pm.get_python_pids()
# print "PID list 2:"
# print pids_1
## Prints a list of two PIDs, e.g. ['1', '2']
# Enter Qt application main loop
app.exec_()
# If execution reaches this point, then the GUI window was closed
# To kill the Django server, we must first figure out what
# its Windows PID is
pids_2 = pm.get_python_pids()
# print "PID list 3:"
# print pids_2
## Prints a list of three PIDs, e.g. ['1', '2', '3']
## The proper process to kill is whichever one is new in pids_2.
That is to
## say, we should kill the process which is listed in pids_2 but
is not
## present in pids_1. In this example, it would be PID '3'.
# max_kill is the maximum number of processes named 'python.exe'
to kill
max_kill = 1
for pid in pids_2:
if pid in pids_1:
continue
else:
subprocess.call(["taskkill", "/F", "/pid", pid])
max_kill -= 1
if max_kill == 0:
break
# Now exit Python entirely
sys.exit()
Zak F.
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