《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:
        1. Basic element of resource allocation in the operating system.
        2. Possesses independent resources:
            a. code segment
            b. data segment
                i. constant data
                ii. global variable
                iii. stack
                iv. heap
            c. register
            d. program counter
        3. Have independent virtual address mapping.
        4. It has life cycle, it is running, in contrast to a program.
    Thread:
        1. Basic element of CPU scheduling.
        2. Possesses part of independent resources:
            a. register
            b. stack
            c. program counter
        3. Multiple threads share part of resources in same process:
            a. code segment
            b. data segment
                i. constant data
                ii. global variable
                iii. heap
        4. All threads in a process share the same address space.
        5. It has life cycle