《Cracking the Coding Interview》——第16章：线程与锁——题目1

2014-04-27 19:09

题目：线程和进程有什么区别？

解法：理论题，操作系统教材上应该有很详细的解释。我回忆了一下，写了如下几点。

代码：

 // 16.1 What is the difference between process and thread?
 Answer:
     Process:
         . Basic element of resource allocation in the operating system.
         . Possesses independent resources:
             a. code segment
             b. data segment
                 i. constant data
                 ii. global variable
                 iii. stack
                 iv. heap
             c. register
             d. program counter
         . Have independent virtual address mapping.
         . It has life cycle, it is running, in contrast to a program.
     Thread:
         . Basic element of CPU scheduling.
         . Possesses part of independent resources:
             a. register
             b. stack
             c. program counter
         . Multiple threads share part of resources in same process:
             a. code segment
             b. data segment
                 i. constant data
                 ii. global variable
                 iii. heap
         . All threads in a process share the same address space.
         . It has life cycle