VxWorks learning

VxWorks The operating system is the United States WindRiver The company 1983 An embedded real-time operating system designed and developed in （RTOS）, Is a key component of the embedded development environment ;

form

VxWorks The operating system consists of the following components ：

kernel

Multitasking （ Preemption based on priority , At the same time, it supports time slice scheduling between tasks with the same priority ）
Synchronization between tasks
Interprocess communication mechanism
Interrupt handling
Timer and memory management mechanism

I/O System

VxWorks Provides a fast and flexible interface with ANSI C Compatible I/O System , Include UNIX The standard Basic I/O (creat(),remove(),open(),close(),read(),write(),and ioctl()),Buffer I/O (fopen(),fclose(),fread(),fwrite(),getc(),putc()) as well as POSIX Standard asynchronous I/O.VxWorks Include the following drivers ： Network driven 、 Pipe drive 、RAM Disk drive 、SCSI drive 、 Keyboard drive 、 Display drive 、 Disk drive 、 Parallel port driver, etc .

file system

Supports four file systems ：dosFs,rt11Fs,rawFs and tapeFs
Support in a separate VxWorks There are several different file systems on the system at the same time .
Board level support package BSP（Board Support Package）
Board level support package to VxWorks The operating system provides a unified software interface for the hardware function operation of various boards , It's a guarantee VxWorks The key to OS portability , It includes hardware initialization 、 Interrupt generation and processing 、 Hardware clock and timer management 、 Local and bus memory address mapping 、 Memory allocation and so on . Each board level support package includes one ROM start-up （Boot ROM） Or other activation mechanisms .

Network support

It provides a reference to other VxWorks Systems and TCP/IP Network system " transparent " visit , Include and BSD Socket compatible programming interface , Remote procedure call （RPC）,SNMP（ optional ）, Remote file access （ Including client and server NFS Mechanism and use RSH,FTP or TFTP Non - NFS Mechanism ） as well as BOOTP And the agent ARP、DHCP、DNS、OSPF、RIP. Whether it's a loosely coupled serial line 、 The standard Ethernet connection is also tightly coupled, using the backplane bus of shared memory , be-all VxWorks Network mechanisms follow the standard Internet agreement .

Utility library

VxWorks Provides an extension set of utility routines , Including interrupt handling 、 Watchdog timer 、 Message login 、 Memory allocation 、 Character scanning 、 Line buffer and ring buffer management 、 Linked list management and ANSI C standard .