Posted by hank, Wed Nov 21 22:45:00 UTC 2007
I was on IRC tonight and someone was having trouble with their NASM homework. I decided to help them by learning NASM and coding up their homework problem for fun. It was pretty cool.
Displaying articles with tag c
Posted by hank, Sun Sep 09 10:48:00 UTC 2007
OK - so I love DDR. I was trying to compile Stepmania this morning, and found that it has some issues. I found the answer to the first issue in this post, and found the answer to the second in this one. Apparently, there are some patches that have gone into 4.0 CVS that haven’t been put into the old source.
Procedure
Get the Stepmania Source and extract it somewhere. Now we need to get stuff to compile it:
sudo apt-get install gcc-3.4 g++-3.4 build-essential liblualib50-dev
CC=gcc-3.4 CXX=g++-3.4 ./configure
Now we should have a nice Makefile and such. If you get dependency problems, you can figure that out on your own. You’ll need SDL and a few other things too, but I already had those.
First, I got this:
rch/InputHandler/InputHandler_SDL.cpp:126: error: `int SDL_EventMask' redeclared as different kind of symbol
/usr/include/SDL/SDL_events.h:108: error: previous declaration of `typedef enum SDL_EventMasks SDL_EventMask'
arch/InputHandler/InputHandler_SDL.cpp:126: error: declaration of `int SDL_EventMask'/usr/include/SDL/SDL_events.h:108: error: conflicts with previous declaration `typedef enum SDL_EventMasks SDL_EventMask'
arch/InputHandler/InputHandler_SDL.cpp: In constructor `InputHandler_SDL::InputHandler_SDL()':
arch/InputHandler/InputHandler_SDL.cpp:176: error: expected unqualified-id before '|=' token
arch/InputHandler/InputHandler_SDL.cpp: In member function `virtual void InputHandler_SDL::Update(float)':
arch/InputHandler/InputHandler_SDL.cpp:195: error: expected primary-expression before ')' token
make[2]: *** [InputHandler_SDL.o] Error 1
make[2]: Leaving directory `/usr/local/src/StepMania-3.9-src/src'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/usr/local/src/StepMania-3.9-src/src'
make: *** [all-recursive] Error 1
Then, after I fixed that, I got this:
if g++ -DHAVE_CONFIG_H -I. -I. -I. -I/usr/include/lua50 -I/usr/include/SDL -D_GNU_SOURCE=1 -D_REENTRANT -finline-limit=300 -Wall -W -Wno-unused -Wno-switch -O3 -MT LinuxThreadHelpers.o -MD -MP -MF ".deps/LinuxThreadHelpers.Tpo" \
-c -o LinuxThreadHelpers.o `test -f 'archutils/Unix/LinuxThreadHelpers.cpp' || echo './'`archutils/Unix/LinuxThreadHelpers.cpp; \
then mv -f ".deps/LinuxThreadHelpers.Tpo" ".deps/LinuxThreadHelpers.Po"; \
else rm -f ".deps/LinuxThreadHelpers.Tpo"; exit 1; \
fi
archutils/Unix/LinuxThreadHelpers.cpp:32: error: ‘gettid’ has not been declared
archutils/Unix/LinuxThreadHelpers.cpp:39: error: expected initializer before ‘CStdStringA’
archutils/Unix/LinuxThreadHelpers.cpp: In function ‘uint64_t GetCurrentThreadIdInternal()’:
archutils/Unix/LinuxThreadHelpers.cpp:136: error: ‘gettid’ was not declared in this scope
make[2]: *** [LinuxThreadHelpers.o] Error 1
make[2]: Leaving directory `/home/jon/Desktop/StepMania-3.9-src/src'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/home/jon/Desktop/StepMania-3.9-src/src'
make: *** [all-recursive] Error 1
Time to patch:
cd StepMania-3.9-src/
wget -O - http://ralree.info/assets/2007/9/9/stepmania-3.9-glibc.patch | patch -p1
wget -O - http://ralree.info/assets/2007/9/9/sdl.patch | patch -p0
This should fix most of it. I’m still having trouble with this though:
if g++-3.4 -DHAVE_CONFIG_H -I. -I. -I. -I/usr/include/lua50 -I/usr/include/SDL -D_GNU_SOURCE=1 -D_REENTRANT -finline-limit=300 -Wall -W -Wno-unused -Wno-switch -O3 -MT CryptHelpers.o -MD -MP -MF ".deps/CryptHelpers.Tpo" \
-c -o CryptHelpers.o `test -f 'CryptHelpers.cpp' || echo './'`CryptHelpers.cpp; \
then mv -f ".deps/CryptHelpers.Tpo" ".deps/CryptHelpers.Po"; \
else rm -f ".deps/CryptHelpers.Tpo"; exit 1; \
fi
crypto51/misc.h: In function `std::string CryptoPP::IntToString(T, unsigned int) [with T = unsigned int]':
crypto51/simple.h:25: instantiated from here
crypto51/misc.h:176: warning: comparison of unsigned expression < 0 is always false
g++-3.4 -finline-limit=300 -Wall -W -Wno-unused -Wno-switch -O3 -rdynamic -o stepmania Screen.o ScreenAttract.o ScreenBookkeeping.o ScreenBranch.o ScreenCaution.o
################### ...........
################### ...........
pubkey.o queue.o randpool.o rsa.o sha.o strciphr.o CryptHelpers.o -lvorbisfile -lvorbis -logg -lmad /usr/lib/liblualib50.a /usr/lib/liblua50.a -L/usr/lib -lSDL -lXtst -lGL -lGLU ./libresample/libresample.a -ldl -lpng -lz -lm -ljpeg -lz -lpthread
`.gnu.linkonce.t._Z23CourseEntryTypeToString15CourseEntryType' referenced in section `.rodata' of EditCoursesMenu.o: defined in discarded section `.gnu.linkonce.t._Z23CourseEntryTypeToString15CourseEntryType' of EditCoursesMenu.o
collect2: ld returned 1 exit status
make[2]: *** [stepmania] Error 1
make[2]: Leaving directory `/nexus/rofl/hank/tmp/StepMania-3.9-src/src'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/nexus/rofl/hank/tmp/StepMania-3.9-src/src'
make: *** [all-recursive] Error 1
Leave a comment if you know the answer.
Update
00:59:55 < hardwarehank> the stable is - massively unstable
01:00:02 < hardwarehank> needed 2 patches and it still didnt work
01:00:13 < hardwarehank> has a linker error in the final compile :(
01:00:19 < DevastatorIIC> worked immediately after untarring here
01:00:30 < hardwarehank> you got the binary :)
01:00:38 < DevastatorIIC> yeah, and it worked ;)
01:00:41 < hardwarehank> maybe i should do that
01:02:52 < hardwarehank> woohoo
01:02:55 < hardwarehank> DevastatorIIC++
Lesson: Don’t overcomplicate things.
Posted by hank, Wed Aug 01 16:24:00 UTC 2007
I had some trouble compiling PL/Ruby for PostgreSQL today on Modzer0. I solved it with some clever extconf.rb switches:
ruby extconf.rb --with-pgsql-include=/usr/include/pgsql/ --with-pgsql-version=81
Now I avoid the problems I was having before:
[root@modzer0 plruby-0.5.1]# make
make[1]: Entering directory
#...
In function ‘perm_fmgr_info’:plruby.c:116: error: ‘TopMemoryContext’ undeclared (first use in this function)
plruby.c:116: error: (Each undeclared identifier is reported only once
plruby.c:116: error: for each function it appears in.)
plruby.c: In function ‘plruby_call_handler’:
plruby.c:706: warning: unused variable ‘result’
plruby.c: In function ‘pl_compile’:
plruby.c:875: error: subscripted value is neither array nor pointer
plruby.c:876: error: subscripted value is neither array nor pointer
plruby.c:879: error: subscripted value is neither array nor pointer
plruby.c:889: error: subscripted value is neither array nor pointer
plruby.c:937: error: ‘TopMemoryContext’ undeclared (first use in this function)
make[1]: *** [plruby.o] Error 1
Now I just have to create the language in Postgres. I’m making it trusted since I don’t want anyone doing anything nasty. I might build the untrusted version later like Robby did here.
CREATE FUNCTION plruby_call_handler() RETURNS language_handler
AS '/usr/lib/ruby/site_ruby/1.8/i386-linux/plruby.so'
LANGUAGE C;
CREATE TRUSTED LANGUAGE 'plruby'
HANDLER plruby_call_handler
LANCOMPILER 'PL/Ruby';
Voila!
Procedural Languages
Name | Trusted?
--------+----------
plperl | yes
plruby | yes
Posted by hank, Sun Jun 10 13:13:00 UTC 2007
Well, I was over at Debian Package of the Day when I noticed an article on KLone. It’s a little application framework that allows you to do XHTML templating in C! Then, you can compile it and send it off to any Linux machine (with a few dependencies of course) to run it. I got it, and it didn’t work for me at first. Then, for some reason, it started working. Here’s what I think did it:
In Ubuntu, I did this:
sudo apt-get install build-essential libssl-dev quilt klone klone-package
Then, I made a new test project:
make-klone-project create -p myhello
This creates a new project directory. Now, go into it and make it your new home:
cd myhello-0.1/
cd userdata/
mkdir www etc
vim etc/kloned.conf
I’m just going to assume you’re using vim because, well, you should be. Make the config file look something like this:
server_list my_http
allow_root yes
my_http
{
type http
addr.type IPv4
addr.port 8880
dir_root /www
}
Now lets give it something to work with (note we’re still in userdata):
vim www/index.klone
<html> <head><title>Hello Lady!</title></head> <body> <% io_printf(out, "Hey, Lady! You call him Dr. Jones!"); %> </body> </html>
Now add your precious files to the sauce:
cd ../../site/
klone -c import ../userdata/
# 2 dirs and 2 files imported
cd ..
Now, compile and run it:
kloned-build -o myapp userdata
./myapp -F # This runs it in non-daemonized mode
If you don’t get any errors, congratulations. That means I did something right.
Now, just hop over to here or wherever you specified it to run, and it will magically appear.
Now you can do this:
<html> <head><title>Hello World</title></head> <body> <% int i; for(i=0; i < 10; ++i) { io_printf(out, "Hello Lady! %d<br />", i); } %> </body> </html>
Then run this to rebuild and re-run the server:
kloned-build -o myapp userdata && ./myapp -F
Update
So, I ran some tests, and I have to say, the speed increase from C might be really awesome every now and again. Here’s the code:
clock_t curtime = clock(); #define SEED 35791246 int niter=10000000; double x,y; int count=0; /* # of points in the 1st quadrant of unit circle */ double z; double pi; /* initialize random numbers */ srand(SEED); count=0; for ( i=0; i<niter; i++) { x = (double)rand()/RAND_MAX; y = (double)rand()/RAND_MAX; z = x*x+y*y; if (z<=1) count++; } pi=(double)count/niter*4; io_printf(out, "# of trials= %d , estimate of pi is %g \n",niter,pi); io_printf(out, "%f", (double)(clock() - curtime)/(double)CLOCKS_PER_SEC);
All this is is a Monte Carlo method of calculating pi that I stole from here. It takes 0.56 seconds of CPU time on my Core 2 Duo @ 3.3Ghz. Now for the Ruby on Rails test:
# Controller @start = Time.now srand(35791246) iter = 10000000 count = 0 0.upto(iter) do |i| x = rand().to_f y = rand().to_f z = x*x+y*y count += 1 if z <= 1 end @pi = count.to_f / iter * 4 @end = Time.now
This finishes in 20.75 seconds (about 40x slower). C is great for things like this. I hope to use KLone in the future for these kinds of tasks.
About Me
I'm a computer programmer from Ellicott City, MD.
I go to OSCON every year, write random code, and blag about it here.
I enjoy cooking,
reviewing beer, hiking, kayaking, and watching movies and television shows.
Email me: ralree@gmail.com
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