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问题

有多个就绪的进程或线程,哪一个应该先执行?

When to schedule

  • Process creates
  • Process exits
  • Process blocks on IO
  • IO interrupts
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IPC

inter process communication

Race Condition

2 process want to eat same cake

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definition

The running program

Process versus Thread

内存

  • 进程有独立的内存空间
  • 线程之间共享内存空间
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软件配置

软件生存周期各个阶段活动的产物经审批后即可称之为软件配置项

过程

  1. Function Test
  2. Performance Test
  3. Acceptance Test
  4. Installation Test
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黑白盒

黑盒

  • 已知产品所应具有的功能,通过测试来检测每个功能是否都能正常使用

白盒

  • 已知产品的内部工作过程,可以通过测试证明每种内部操作是否符合设计规格要求,所有内部成分是否以经过检查
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设计的定义

Design is the creative process of transforming the problem into a solution, the description of the solution is call the DESIGN.

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