linux进程间通信
linux进程间通信主要分为以下4个领域
(1)消息传递(管道,FIFO,消息队列)
(2)同步(互斥锁,条件变量,读写锁,信号量)
(3)共享内存区(匿名共享内存区,有名共享内存区)
(4)过程调用(Solaris门,Sun RPC)
linux进程间的信息共享可以分为
(1) 基于文件系统的共享
(2) 基于内核的共享
(3) 基于共享内存区的共享
IPC对象的持续性
(1)随进程间持续的IPC对象一直存在到打开着该对象的最后一个进程关闭该对象的最后一个进程关闭该对象为止。
(2)随内核持续的IPC对象一直存在到内核重新自举或显式删除该对象为止。
(3)随文件系统持续的IPC对象一直存在到显示删除该对象为止。即使系统自举了,该对象还是存在的。
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