Message 56682 - Python tracker

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Author	draghuram
Recipients	draghuram, superwesman
Date	2007-10-23.16:58:44
SpamBayes Score	0.09007897
Marked as misclassified	No
Message-id	<1193158725.23.0.0395698555458.issue1256@psf.upfronthosting.co.za>
In-reply-to

Content
PIPE on POSIX are implemented using pipe system call so it will have all the limitations of the system buffering that is used for implementing pipes. The buffer size is system dependent. For example, on my Linux, I hit the hang condition at 64K and not 20480 bytes (as is your case). What basically happens is that the child fills up the pipe buffer and is blocked until space is available. Since the parent in your test script is not reading the bytes, space will never be freed up. I suggest that the bug is closed as invalid.

PIPE on POSIX are implemented using pipe system call so it will have all
the limitations of the system buffering that is used for implementing
pipes. The buffer size is system dependent. For example, on my Linux, I
hit the hang condition at 64K and not 20480 bytes (as is your case).
What basically happens is that the child fills up the pipe buffer and is
blocked until space is available. Since the parent in your test script
is not reading the bytes, space will never be freed up. 

I suggest that the bug is closed as invalid.

History
Date	User	Action	Args
2007-10-23 16:58:45	draghuram	set	spambayes_score: 0.090079 -> 0.09007897 recipients: + draghuram, superwesman
2007-10-23 16:58:45	draghuram	set	spambayes_score: 0.090079 -> 0.090079 messageid: <1193158725.23.0.0395698555458.issue1256@psf.upfronthosting.co.za>
2007-10-23 16:58:45	draghuram	link	issue1256 messages
2007-10-23 16:58:44	draghuram	create