threading problems

[gabitzu4224]

main problem is i dont really understand threads, and at the moment they are my only option because im working on windows and it doesnt support fork processes.ran this program and all i got was a random integer ( 348 )

import thread

mutex=thread.allocate_lock()
f=open('newText.txt.','w')

def counter2(ID):
mutex.acquire()
f.write(ID,'\nNumbers are ')
for i in range(5): f.write(i)
f.write('\n')
mutex.release()


thread.start_new(counter2,(1,))



...and and all i got was an integer which wasnt even supposed to appear (i understand that each thread when started they return a value which is supposed to be ignored), the file cointains nothing

[ilikepython]

main problem is i dont really understand threads, and at the moment they are my only option because im working on windows and it doesnt support fork processes.ran this program and all i got was a random integer ( 348 )

import thread

mutex=thread.allocate_lock()
f=open('newText.txt.','w')

def counter2(ID):
mutex.acquire()
f.write(ID,'\nNumbers are ')
for i in range(5): f.write(i)
f.write('\n')
mutex.release()


thread.start_new(counter2,(1,))



...and and all i got was an integer which wasnt even supposed to appear (i understand that each thread when started they return a value which is supposed to be ignored), the file cointains nothing

First of all please us code tags.

In your counter2 function there are a couple errors. Why are you passing 2 arguements to f.write()? Why are you passing an integer to f.write()? You should only pass a single string to that function.

Also, you shouldn't exit the main thread until all your chil threads have exited. You could do something like this:

import thread
import time
 
mutex=thread.allocate_lock()
f=open('newText.txt.','w')
done = false
 
def counter2(ID):
    mutex.acquire()
    f.write(ID,'\nNumbers are ')
    for i in range(5):
        f.write(i)
    f.write('\n')
    mutex.release()
    done = true
 
 
thread.start_new(counter2,(1,))
 
while not done:
    time.sleep(0.2)
 

That might not be necessary though depending on what you are doing.