抽烟者问题。假设一个系统中有三个抽烟者进程，每个抽烟者不断地卷烟并抽 烟。抽烟者卷起并抽掉一颗烟需要有三种材料：烟草、纸和胶水。一个抽烟者有烟 草，一个有纸，另一个有胶水。系统中还有两个供应者进程，它们无限地供应所有 三种材料，但每次仅轮流提供三种材料中的两种。得到缺失的两种材料的抽烟者在 卷起并抽掉一颗烟后会发信号通知供应者，让它继续提供另外的两种材料。这一过 程重复进行。 -Smoker problem. Suppose a system has three smoker processes, each smoker and continue to smoke cigarettes. Smoker smoke rolled up and deprived of a need to have three materials: tobacco, paper and glue. A tobacco smoker, a paper, glue another. There are two systems provider processes that unlimited supply of all three materials, but each time only two of the three in turn provided material. Get the missing two materials in roll and deprived smokers smoke after a notice will be sent a signal provider, it continues to provide an additional two materials. This process is repeated.