On Fri, Apr 16, 2010 at 12:04 AM, Jan Schampera <jan.schamp...@web.de>wrote:
> Clark J. Wang schrieb: > > In C code I can use lockf(), flock(), semaphore and mutex for locking / > > unlocking. Can bash provide some similar mechanisms? > > > > For simple things, which don't need to be 1000% rocksolid, you can use > atomic operations like mkdir or noclobbered redirection for mutex purposes. > > mkdir seems to be better but it's a bit strange for locking purpose. :) And if the script crashes the dir will be left unlocked. Accessing the file locking mechanisms of the kernel isn't possible so > far, but Bash has a plugin framework. > This may be the best way for the job. Actually I'm writing a loadable builtin command named `lockf' which internally uses lockf(3). If the script crashes the file will be automatically closed/unlocked by the OS. The only inconvenience is that I have to port/compile the code to every platform I'm working on. > > Jan >
