On 12/6/08, Roland Mainz <roland.mainz at nrubsig.org> wrote:
>
> Hi!
>
> ----
>
> Is there a way that multiple proceses can write to the same pipe fd but
> keep their writes "atomic" (regardless of the size, e.g. the writes may
> be 1 byte or 300GB), e.g. that the data (or better "record") being
> written appears in one piece ?
>
> For example:
> process 1 writes "aaaaaaaa", process 2 writes "bbbbbbb" and process 3
> writes "cccccccccccccc" to a single pipe. The consumer reading from the
> pipe should get either:
> -- snip --
> "aaaaaaaabbbbbbbcccccccccccccc"
> "aaaaaaaaccccccccccccccbbbbbbb"
> "bbbbbbbccccccccccccccaaaaaaaa"
> "bbbbbbbaaaaaaaacccccccccccccc"
> "ccccccccccccccaaaaaaaabbbbbbb"
> "ccccccccccccccbbbbbbbaaaaaaaa"
> etc.
> -- snip --
>
> ... but never something like...
> -- snip --
> "aaaabbbaabbbbccccccccaacccccc"
> "cbccccbccccbcccccbbbaaaaabaaa"
> -- snip --
Isn't this what putmsg() and getmsg() are for?
Out of curiosity - Is this related to the record oriented pipes you
mentioned in the ksh93 review thread?
Chris
--
^---^
(@)v(@) Chris Pickett
| / IT consultant
===m==m=== pkchris at users.sourceforge.net
