minix 3 and lua, berkeley db, and sqlite

8/3/2019 Minix 3 and Lua, Berkeley Db, And Sqlite

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Minix 3 and Lua, Berkeley DB, and SQLite

Source: http://newsgroups.derkeiler.com/Archive/Comp/comp.os.minix/200511/msg00242.html

From: jfathman@xxxxxxx

Date: 12 Nov 2005 18:36:18 0800

I spent my Saturday experimenting with building open source utility

software under Minix 3. I had mixed results.

Berkeley DB from www.sleepycat.com is a larger product than I remember.

It won't compile because it expects a GNU gcc compatible tool chain on

a Unix target. SQLite from www.sqlite.org won't build for the same

reason.

I had good success building Lua 5.0.2. I made minor mods to change

'gcc' to 'cc', etc. in a 'config' file, as recommended in the INSTALL

file. It built successfully, and some of the Lua test scripts worked.

The 'sieve.lua' test script failed after several iterations. I used

Minix 'chmem' to increase the stack/heap. With each increase,

'sieve.lua' progressed further, until finally it ran to successful

completion after the last stack/heap increase:

# chmem +1000 lua

lua: Stack+malloc area changed from 131072 to 132072 bytes.

# chmem +100000 lua


# chmem +100000 lua


VIM 6.3 for Minix 3 recognizes '.lua' script files, so Lua keyword

syntax highlighting works without doing anything special. The Lua

source is attractive. For example, 'sieve.lua' is:

the sieve of of Eratosthenes programmed with coroutines

typical usage: lua e N=1000 sieve.lua | column

generate all the numbers from 2 to n

function gen (n)

return coroutine.wrap(function ()

for i=2,n do coroutine.yield(i) end

end)

end

filter the numbers generated by `g', removing multiples of `p'


Minix 3 and Lua, Berkeley DB, and SQLite 1
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function filter (p, g)

return coroutine.wrap(function ()

while 1 do

local n = g()

if n == nil then return end

if math.mod(n, p) ~= 0 then coroutine.yield(n) end

endend)

end

N=N or 1000 from command line

x = gen(N) generate primes up to N

while 1 do

local n = x() pick a number until done

if n == nil then break end

print(n) must be a prime number

x = filter(n, x) now remove its multiples

end

Lua seems like a pretty good fit for Minix 3 where an embedded

application will benefit from integration with a scripting language,

and Python is perhaps a little heavy. I credit Lua for distributing

basic ANSI C code and simple make files that do not require GNU tool

chain compatibility. From www.lua.org:

> Lua is a language engine that you can embed into your application.

> This means that, besides syntax and semantics, Lua has an API

> that allows the application to exchange data with Lua programs

> and also to extend Lua with C functions. In this sense, Lua can

> be regarded as a language framework for building domainspecific> languages.

> Lua is implemented as a small library of C functions, written in

> ANSI C, and compiles unmodified in all known platforms. The

> implementation goals are simplicity, efficiency, portability, and

> low embedding cost. The result is a fast language engine with

> small footprint, making it ideal in embedded systems too.

I enjoyed my Saturday with Minix 3 and Lua. I like what I have seen so

far of the ACK compiler and the ash shell, but I am a little concerned

that the lack of the GNU toolchain and the bash shell is going to makeit challenging to port popular (and perhaps necessary) packages to

Minix 3.

Thanks.

Jim

.




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