Hello, I made reading on RT PREEMPT, but didn't find some rules/methods, to make sure that a real time thread keeps its deadline. For example: Can I use in the userspace thread any syscall , or will it results in thread preemption ? Regards, Ran -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html