Dear all, Thanks for all those suggestions. Of course there are platform specific solutions, but I'd like to keep the code 100% cross platform everywhere it's possible.
The issue with file locking, is every OS does not have a system-wide user-writable standard folder. There is /tmp on linux/unix which is standard, but AFAIK windows only has per-user temporary file, and system temp which is not user writable. Also QLocalSocket doesn't do the job under windows, as two processes can listen on the same name (only one will receive data), the conflict is not reported by the API. It seems there is no very good solution. Thiago : some times ago, you wrote about an extension of the QSharedMemory API for having opt-in system wide shared memory in a future Qt release. Was this abandonned? Thanks!
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