spyopensource/os

Java Operation System, it is an operating system that you can build by yourself.

Java OS

This is a Java OS project. It is a microkernel operating system with both the kernel and applications implemented using the Java programming language. This library consist of a JDK, which people can use to build they own software for the operating system.

Build

Run following command to get the source code:

git clone git://s55969da3.adsl.online.nl/jx/os.git

This is a NetBean projecct. It requires compiler and jcore.

os's Issues

send udp via java api

Debug out println doesn't work inside thread

add unittest

run java class

I'm trying to use a JIT compiler or classic way with JVM.

sata support

bootrc doesn't work

there is some problem with vector class

received udp via java api

Portable Operating System Interface

• run native c program with standard library
• Posix System Calls

Network Posix compliance

interfaces:

• int sys_socketcall(int call, unsigned long *args)
• int sys_socket(int family, int type, int protocol)
• int sys_socketpair(int family, int type, int protocol, int usockvec[2])
• int sys_bind(int fd, struct sockaddr *umyaddr, int addrlen)
• int sys_listen(int fd, int backlog)
• int sys_accept(int fd, struct sockaddr *upeer_sockaddr, int *upeer_addrlen)
• int sys_connect(int fd, struct sockaddr *uservaddr, int addrlen)
• int sys_getsockname(int fd, struct sockaddr *usockaddr, int *usockaddr_len)
• int sys_getpeername(int fd, struct sockaddr *usockaddr, int *usockaddr_len)
• int sys_sendto(int fd, void * buff, size_t len, unsigned flags, struct sockaddr *addr, int addr_len)
• int sys_send(int fd, void * buff, size_t len, unsigned flags)
• int sys_recvfrom(int fd, void * ubuf, size_t size, unsigned flags, struct sockaddr *addr, int *addr_len)
• int sys_recv(int fd, void * ubuf, size_t size, unsigned flags)
• int sys_setsockopt(int fd, int level, int optname, char *optval, int optlen)
• int sys_getsockopt(int fd, int level, int optname, char *optval, int *optlen)
• int sys_shutdown(int fd, int how)
• int sys_sendmsg(int fd, struct msghdr *msg, unsigned flags)
• int sys_recvmsg(int fd, struct msghdr *msg, unsigned int flags)

problem with generic class

a minimum working filesystem

• read file
• write file
• experimental file system with hash
• java file system api
• POSIX compliance: File and Directory Operations

KISS

keep it

• why to keep it simple? It is easy to maintain.
• why to stupid? it is easy to understand
• make it beautiful, so it make you feel goed (OSjs)
• structuren: https://en.wikibooks.org/wiki/The_Linux_Kernel

Symmetric Multi-Processing (SMP)

It uses multiple processors which shares a common memory and bus. This systems can improve the performance and reliability of parallel applications by distributing the workload among the processors.

some data types does not support yet

• long: https://github.com/sPyOpenSource/compiler/blob/master/src/jx/compiler/nativecode/Reg64.java
• double: https://github.com/sPyOpenSource/compiler/blob/master/src/jx/compiler/nativecode/RegDouble.java
• float: https://github.com/sPyOpenSource/compiler/blob/master/src/jx/compiler/nativecode/RegFloat.java

wifi network

• driver
• wpa

self reproduce os

java os need to prive a development environment for it own development:

• IDE
• compiler
• test tools

Webserver

native compiler and runtime

Java ASM is a framework for manipulating and analyzing Java bytecode. It can be used to dynamically generate classes in binary form.

add lance net driver

read a file via java api

minimum jdk

https://en.wikipedia.org/wiki/Java_Platform,_Standard_Edition#General_purpose_packages

read a file from hard drive

concurrence hashmap

webserver read from filesystem

keyboard

hashmap is not functioning

• found out the problem: float
• fixed the problem see issue #14

multicore

webserver is slow

network driver is too slow

cpu usage is too high

it is because no delay in the kernel!

console

release product build

version 1.0: here

ping is slow

network driver is too slow

License

usb support

https://launchpad.net/libusb4j

JAVA Scheduler Support

zie paket: jx.scheduler (https://github.com/sPyOpenSource/os/tree/master/src/jx/scheduler)

• LLRRobin en HLRRobin
• bij een nieuw thread pak de rustigste core.
• Veelal wordt er om elke 15ms van thread gewisseld op een core
• 2/8 rule
• interrupt

translation comments from german to english

• https://github.com/sPyOpenSource/os/blob/master/src/buffercache/BufferCache.java
• https://github.com/sPyOpenSource/os/blob/master/src/buffercache/BufferHead.java
• https://github.com/sPyOpenSource/os/blob/master/src/jx/buffer/BufferHead.java

Readme

string + doesn't work

run jar file

JAR file is a file that contains compressed versions of Java class files and other resources, such as images, audio, and text. JAR files are used to distribute and run Java applications and libraries on all Java platform.

run native program using posix

posix

shutdown

switch with string doesn't work

api for core temperature reading