Barak, Ron wrote:
Hi,
This is my first try at IPC in Python, and I would like to ask your help
with the following problem:
I would like to spawn a process with P_NOWAIT, and pass some data to the
child process.
I created two scripts to try IPC (in a blocking way):
$ cat subprocess_sender.py
#!/usr/bin/env python
import subprocess
proc = subprocess.Popen(["python", "-u", "subprocess_receiver.py"],
stdin=subprocess.PIPE, shell=True)
proc.communicate(input="this is sent from subprocess_sender.py")[0]
proc.stdin.close()
and
$ cat subprocess_receiver.py
#!/usr/bin/env python
import sys
print sys.stdin.readline()
These scripts intercommunicate nicely:
$ python -u subprocess_sender.py
this is sent from subprocess_sender.py
The example in the documentation is:
18.1.3.4. Replacing the os.spawn family¶
<http://docs.python.org/library/subprocess.html#replacing-the-os-spawn-family>
P_NOWAIT example:
pid = os.spawnlp(os.P_NOWAIT, "/bin/mycmd", "mycmd", "myarg")
==>
pid = Popen(["/bin/mycmd", "myarg"]).pid
[snip]
The documentation is showing the 'subprocess' equivalents of older calls
(the 'subprocess' module was added in Python 2.4).
This means is that "Popen" is equivalent to calling "spawnlp" with
P_NOWAIT.
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