Hi, I am sure the subject explain my intention. I got two processes trying to modifying the same place. I want them to do it one after one, or, if their operations interleave, I would like to let them know that the content have been changed and polluted by the other so that the content should be given up. That is, I would rather give up the data, if polluted, than having a false one. I try to set a atomic ref counter, but it seems impossible to do that without a lock to synchronize. Note that I don't want a strict synchronization: the situation is a lot better. The data can be given up if that place has been polluted. Yubin -- To unsubscribe from this list: send the line "unsubscribe perfbook" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
