同步变量也是变量
由用户空间委托内核空间进行维护；
有赋值、检查、操作、重置的语义；
SRE实战 互联网时代守护先锋，助力企业售后服务体系运筹帷幄！一键直达领取阿里云限量特价优惠。线程依赖这些变量进行状态的维护和同步；
同步变量是可以线程间共享的变量；
同步变量的查询和操作通过系统调用执行；
可能会阻塞执行；
Synchronization
Computer Science
In computer science, synchronization refers to one of two distinct but related concepts: synchronization of processes, and synchronization of data. Process synchronization refers to the idea that multiple processes are to join up or handshake at a certain point, in order to reach an agreement or commit to a certain sequence of action.
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