nick at sqrt.co.uk
Mon Aug 16 01:55:25 PDT 2004
Stefan Bellon wrote:
> John Tytgat wrote:
>>I guess if pthread switching is disabled and you make sure no
>>callbacks can kick in (running in SVC mode ?), I think you have what
>>you want to have. Any particular usecase where this is wanted ?
> In GnuPG a race condition of two concurrent GnuPG processes was
> discovered. GnuPG expects rename(a,b) to move a to b even if b exists.
Though it is feasible in many ways within UnixLib to support this (one
possibility would be to add a locking SWI to the UnixLib module), we
cannot prevent the external modification of a file by another
application, like the Filer or a SharedCLib application occuring at the
> Not that this race condition would matter as I doubt many people use
> GnuPG on RISC OS, let alone two processes running at the same time, but
> nevertheless, I think rename() should be "fixed" in UnixLib to do what
> SUSv3 says.
You're right; it should be. Since it is that and the POSIX standards
that we are attempting to follow.
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