Research on the method of concurrency control in collaborative design base on Tentative Hold protocol

To solve the problem that collaborative design concurrency control cannot adopt optimistic locking mechanism or traditional pessimistic locking mode, THP(Tentative Hold Protocol) is introduced into collaborative design concurrency control method on the basis of studying on it and its transaction model. And then, a conflict prevention method is proposed based on THP. The method avoids deadlock and ensures operational priority for customers with higher privilege through object resource request, resource book, operation broadcast and real-time perception. Finally, closed single-stage worm drive is set as an example to illustrate the validity of this method.