Le 14/02/2012 10:32, Lukasz Sokol a écrit :
On 14/02/2012 08:43, Antonio Fortuny wrote:
Hello Antonio,
Linux ? I'm still looking for a solution equivalent to the Windows
mutexes. Events seem to be local to a process. Semaphores could be a
solution but with Lazarus 0.9.31 on an OpenSuse 11.4 64 bit,
semaphores can only be used unnamed (*sem_init* function is
available) because function *sem_open* is not defined, only on DARWIN
OS. The problem with a file is that I don't know how to use it as a
semaphore with the above constraints. The problem looks like a token
problem.
Antonio.
System-wide solutions for Linux is the *Unix-way*, is to create a lock-file;
Got it.
If you create one on a tmpfs mounted directory,
What do you call a "tmpfs mounted directory" ? I'm only a pascal
programmer not a system guy
it will all happen in
memory, hence no hard-drive storage access will happen (unless moved to swap,
but in your case it won't ever happen) so all you need to do is check for
lock file existence.
Does it mean that every process will have to create the file ? An
open-close sequence checking the IOResult would be enough ?
(IMHO)
There is also futex (Fast Userspace muTEX) but I don't know much about that one;
http://en.wikipedia.org/wiki/Futex
HTH.
L.
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