某系统中采用固定优先级调度，有3个任务，优先级顺序为X>Y>Z,任务Z先执行，并且运行过程中独占了共享资源S，在释放S之前，任务X和Y开始运行，X也申请资源S，Y和Z之间没有共享资源，则三个任务执行完成的顺序是（)。
- A.X、Y、Z
- B.Y、X、Z
- C.Y、Z、X
- D.Z、X、Y
正确答案及解析
正确答案
解析
本题出的不严谨，并没有给出具体执行时间和流程供判断。本题应该这样理解：Z先执行，独占资源S，XY后执行，X优先级最高先执行，但要等待资源S被释放，因此转由Y再执行，可判断Y比X先执行完，然后等资源S释放后，再执行X直到结束，再继续执行Z直到结束。
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