It's not too difficult:
# subp.py
import sys
import time
for i in range(10):
sys.stdout.write('I am subprocess\n')
sys.stdout.flush() # this may not be necessary
time.sleep(1)
# writer.py
import subprocess
import time
subp = subprocess.Popen(['/usr/bin/python', '-u', './subp.py'],
stdout=subprocess.PIPE)
while True:
time.sleep(1)
print('I am main process.') # write this to one section of the file
if subp.poll() != None: # the subprocess has terminated
break
stdout = subp.stdout.readline()
print(stdout) # write this to the other section
brucewa...@broo:~/Documents$ python ./writer.py
I am main process.
I am subprocess
I am main process.
I am subprocess
I am main process.
I am subprocess
I am main process.
I am subprocess
I am main process.
I am subprocess
I am main process.
I am subprocess
I am main process.
I am subprocess
I am main process.
I am subprocess
I am main process.
I am subprocess
I am main process.
I am subprocess
I am main process.
On Thu, Mar 18, 2010 at 12:52 AM, Steve Holden <st...@holdenweb.com> wrote:
> Chris Colbert wrote:
> [top-posting switched to bottom-posting]
> >
> > On Thu, Mar 18, 2010 at 12:20 AM, Gabriel Genellina
> > <gagsl-...@yahoo.com.ar <mailto:gagsl-...@yahoo.com.ar>> wrote:
> >
> > En Wed, 17 Mar 2010 23:42:46 -0300, <pyt...@bdurham.com
> > <mailto:pyt...@bdurham.com>> escribió:
> >
> >
> > Is there a way to open a file for shared write mode under
> > Windows?
> >
> > I have 2 processes that will write to different regions of this
> > shared file.
> >
> >
> > Using the pywin32 package at sourceforge, you have access to the
> > CreateFile function:
> > http://msdn.microsoft.com/en-us/library/aa363858(v=VS.85).aspx
> > You want dwShareMode=FILE_SHARE_WRITE
> >
> > you could also just have one process do the writing for both processes
> > via pipes.
>
> You could, but then you'd have to work out how to avoid blocking on one
> pipe when data was available form the other. Or is this trivially easy,
> and I just don't know enough about pipes?
>
> regards
> Steve
> --
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