Android c++进程的相关内容

Android C++系列：Linux进程间通信(二)

内存映射mmap/munmapmmap可以把磁盘文件的一部分直接映射到内存，这样文件中的位置直接就有对应的内存地址，对文件的读写可以直接用指针来做而不需要read/write函数。#include <sys/mman.h> void *mmap(void *addr, size_t l...

Android C++系列：Linux进程间通信(一)

每个进程各自有不同的用户地址空间，任何一个进程的全局变量在另一个进程中都看不到，所以进程之间要交换数据必须通过内核，在内核中开辟一块缓冲区，进程1把数据从用户空间拷到内核缓冲区，进程2再从内核缓冲区把数据读走，内核提供的这种机制称为进程间通信(IPC，InterProcess Communic...

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Android C++系列：Linux进程(三)

wait/waitpid僵尸进程: 子进程退出，父进程没有回收子进程资源(PCB)，则子进程变成僵尸进程孤儿进程: 父进程先于子进程结束，则子进程成为孤儿进程,子进程的父进程成为1号进程init进程，称为init进程领养孤儿进程#include <sys/types.h> #inclu...

Android C++系列：Linux进程(二)

1. fork#include <unistd.h> pid_t fork(void);子进程复制父进程的0到3g空间和父进程内核中的PCB，但id号不同。 fork调用一次返回两次父进程中返回子进程ID子进程中返回0读时共享，写时复制#include <sys/types.h&g...

Android C++系列：Linux进程(一)

1. 进程概念我们知道，每个进程在内核中都有一个进程控制块(PCB)来维护进程相关的信息，Linux内核的进程控制块是task_struct结构体。现在我们全面了解一下其中都有哪些信息。进程id。系统中每个进程有唯一的id，在C语言中用pid_t类型表示，其实就是一个非负整数。进程的状态，有运...

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