also sprach Fabio Fabbri <[EMAIL PROTECTED]> [2005.08.23.1408 +0200]: > I must admit I didn't know this kind of semaphores. However I think > solve this kind of problem with semaphores is harder than using monitors > or message passing. I don't know how to use monitors under bash, so I > implemented this using message passing through TCP and writing a server > as a first try.
while [ ! -e/var/run/my_semaphore ]; do sleep 1; done > Moreover, this kind of server is flexible and can receive messages > from a service when it's partially started. For example it can > receive a notification from hotplug or udev when sound card or > network card is available, then a script that was waiting for > these devices can be executed without wait for all the execution > of hotplug. They could also just create semaphores. > And last, if deadlock occurs, you can unlock easily sending the right > message. ... or by creating/removing the right semaphore. Don't get me wrong, I appreciate your effort. But before we add such complexity (and TCP *is* complexity), we should know which problems we are trying to solve therewith, which can't be solved with easier methods. > ... or enabling TCP in bash. This is a documented feature of bash > 2, but it was disabled and the man page reports a feature that is > not available. I think bash should be recompiled with TCP support, > otherwise the manual should be modified! File a bug. I don't think bash will ever get TCP support in Debian. It's too dangerous. -- .''`. martin f. krafft <[EMAIL PROTECTED]> : :' : proud Debian developer and author: http://debiansystem.info `. `'` `- Debian - when you have better things to do than fixing a system Invalid/expired PGP (sub)keys? Use subkeys.pgp.net as keyserver! "der beruf ist eine schutzwehr, hinter welche man sich erlaubterweise zurückziehen kann, wenn bedenken und sorgen allgemeiner art einen anfallen." - friedrich nietzsche
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