When this backwardbranch enters the merge, the merge executes and triggers the fork again, which in turn activates its two outgoing branches.
当此逆向分支进入merge时,将执行merge并再次触发fork,后者又会激活它的两个传出分支。
2
All backward connections into one branch of the merge should originate from the same branch of the decision to avoid implicit deadlocks or a lack of synchronization.