files in non-blocking mode?

[Uwe Mayer]

Sunday 28 November 2004 14:49 pm Mathias Waack wrote:

> Uwe Mayer wrote:
>> I want two python programs to communicate over stdIO channels. The
>> one executes the other via the popen3 function:
>> 
>> amc = Popen3("./amc/amc.py", True, 0)
>> line = stdin.readline()
>> amc.tochild.write(line)
>> amc.tochild.flush()
>> print amc.fromchild.readlines()
>> 
>> The problem is that although amc.tochild gets flushed the data
>> never reaches the client until the .tochild fd is closed. Is there
>> any way to put IO channels into non-blocking mode in python?
 
> How do you read the data in the client? Maybe you're using a line
> buffered read? Does your code work if the server includes a trailing
> CR and/or NL in the string before it calls the flush?

Yes, I used 

line = stdin.readline()

and made sure the sending client had a newline ("\n") char appended to the
text. Still, the receiving client's readline() function does not return.

Uwe