safest way to kill a thread

[martinnitram]

Dear all,
in python, a thread can be created by t = threading.Thread. But i
found that when the main (and the thread) program is running and user
use Crtl+C/Crtl+Z to break the program abnormally, the thread is still
running and needed to kill manually (by the pid). Is there had any
safest way to kill/exit the thread program under python (when the
thread program part is a forever loop)?

Thank a lot

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Re: safest way to kill a thread

[martinnitram]

limodou wrote:
>Using Thread's method setDaemon() before you call the start() method.
>Just like :
>t.setDaemon(True)
>t.start()
thank for fast reply.
from python.org doc, said that setDaemon() function as
"The entire Python program exits when no active non-daemon threads
are left."
is it mean that when the main program exit (normally/abnormally), all
threads created will also exit?
  Thank again.

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Re: safest way to kill a thread

[martinnitram]

Great thank for your helping.
Should the 'daemonic' flag at setDaemon() function set to 1/TRUE or
0/FALSE to do such action?

limodou wrote:
>I think only those threads which invoked with setDaemon() method will
>exit, and others will not,  as the main program exit.

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Re: safest way to kill a thread

[martinnitram]

Thank for all helping and sorry that i overlooked the previous
message.

Peter Hansen wrote:
> [EMAIL PROTECTED] wrote:
> > Should the 'daemonic' flag at setDaemon() function set to 1/TRUE or
> > 0/FALSE to do such action?
>
> First of all, it's "True" and "False" in Python, not TRUE
> and FALSE.
>
> Secondly, the answer to the question was in the previous
> message where "limodou" told you about this in the first
> place.  Go back and read it again...
> 
> -Peter

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check socket alive

[martinnitram]

Dear all,
   following are some piece of my code (mainly create a socket
connection to server and loop to receive data):

   # function to create and return socket
   def connect():
server_config = ('192.168.1.50', );
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
sock.connect()
except socket.error:
print "Failed to connect"
return 0
return sock

   # function to receive data
   def recv_for_sock(sock):
 sock.settimeout(25)
 while 1:
   if sock is None:
 return 1
   try:
 recv_data = sock.recv(65535)
 if recv_data:
    # do something
   except socket.timeout:
 print "Socket Timeout"
 time.sleep (10)
 pass
   except socket.error:
 print "Socket Error"
 time.sleep (10)
 pass

  # main function
  if __name__ == '__main__':
  sock = connect()
  if sock:
  errorno = recv_for_sock(sock)
  ... # other stuffs
  else:
  print "Cannot create connection"
  ...

  my question is, when the socket (create a main function) is
disconnected by server (netstat status show close_wait), in
"recv_for_sock" function, it can catch the timeout exception at first
time. After then, the program will looping/hang within the
"recv_for_sock" function (actually is the socket.recv function) and
causing CPU usage to 99%. So, how to detect the socket connection is
closed at this case? I tried to use exception/check socket is None but
no help.
Thank for helping.

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thread end and make main program end also?

[martinnitram]

Dear all,

   Following are some codes:

   from myClass import * # some user define classes, which will catch
the exception within its function

   thread_function():
  myClass myclass
  while (1):
 returnValue = myclass.myfunction();
 print "Return Value %s" % returnValue
  #... cont' to do something

# main
thrd =  threading.Thread(None,thread_function,"thread_function")
thrd.setDaemon(True)
thrd.start()
#... cont' to do other thing

'myClass.myfunction()' will return some value (used 'return') when
caught exceptions and let the 'thread_function()' handle the following.
But now found that after 'myClass.myfunction()' return, both thread
program and main program will exit, when i prefer it will cont' to run.


 is it the default behavior of thread return? Thank a lot

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Re: thread end and make main program end also?

[martinnitram]

  Sorry that i had't show my code clearly.
   The exception try and catch at the module function (i.e.
myClass.myfunction(), which like:

  start code within myClass.py 
def myfunction(self, dbconnection):
  sql_query= 'update table set col=value'
  try:
dbconnection.query(sql_query)
result = dbconnection.store_result()
tuple_list = result.fetch_row(0,0)
  except MySQLError (errno, strerror):
print "MySQLError, errno: %s, strerror: %s" % (errno, strerror)
return 11
  except (errno, strerror): # catch all
print "General Error, errno: %s, strerror: %s" % (errno, strerror)"
return 21
  end code within myClass.py 

  and let main thread function (thread_function()) to handle the sub
thread function by its return value (mainly are update database,
printing message and continuous to run).

   Should the exception catch at main thread  function rather than
class function?
Thank for helping.

   return 1

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