关于安全性算法有个地方我不懂，谁能解释一下，谢谢！！
系统所执行的安全性算法可描述如下：
(1)设置两个向量
工作向量Work。它表示系统可提供给进程继续运行所需要的各类资源数目，它含有m个元素，执行安全算法开始时，work :=Allocation。
Finish。它表示系统是否有足够的资源分配给进程，使之运行完成，开始时先做Finish[i]：＝false；当有足够资源分配给进程时，令Finish[i]：=true。
(2)从进程集合中找到一个能满足下述条件的进程：
①Finish[i]=false
②Needi ≤Work
如找到，执行步骤(3)；否则，执行步骤(4)。
(3)当进程只获得资源后，可顺利执行，直至完成，并释放出分配给它的资源，故执行
Work :=Work+Allocationi；
Finish[i]:＝true；
Go to step 2；
(4)如果所有进程的Finish[i]=true，则表示系统处于安全状态；否则，系统处于不安全状态
我想知道Allocation 和Allocationi 具体有什么区别？为什么(1)中是Allocation 而(3)中的是Allocationi了？
谢谢 ！！！
[解决办法]
和Needi意思差不多，都是指i的资源数，Needi是i需要的，Allocationi是i已经分配的。
[解决办法]
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