Re: Sox with multiple threads?

[Ulrich Klauer <ulrich@chirlu.de>]

Christian Hoene wrote:

> One question. Is sox reentrant. Can I fork a sox program and run two  
> sox chains in parallel?

When you call fork(), the address space is duplicated, so unless there  
are already open files, the processes are completely independent.  
Re-entrancy, on the other hand, is hardly relevant.

I guess what you really mean is thread safety. Unfortunately, libSoX  
uses some global state and is thus not completely thread-safe; even  
running two different chains in parallel in a single thread may lead  
to problems. However, if you
a) use the same settings (buffer size etc.) for all chains,
b) don't rely on the "subsystem" information in the message handler  
(either set verbosity to 0 or use a custom handler that doesn't read  
the subsystem value),
c) don't mind a bit of extra randomness (read: race conditions) in the  
pseudo-random number generator,
then it will probably work.

Ulrich


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