http://blog.gmane.org/gmane.comp.lang.erlang.general hourly 1 1901-01-01T00:00+00:00 http://gmane.org/img/gmane-25t.png http://gmane.org http://comments.gmane.org/gmane.comp.lang.erlang.general/32515 Hi, it's a little bit hard for me to grasp how to plug together gen_servers and gen_fsms that belong to the same service or operation. For example, Joe shows[1] how to abstract away the protocol of a webserver, so you end up having three processes[2]: server <-> some_protocol <-> tcp/udp I would write the server-process as a gen_server and the protocol-process as a gen_fsm. Now I wonder how/where to start the protocol-process from the server: Would I start it from the server's init function and save its pid in the server's state? Or would I start both the server and the protocol-process via the supervisor / supervision strategy? If so, how does the server know about the protocol-process? It's obvious that the protocol-process's pid needs to be passed along somehow to the server. You might have noticed that I'm not sure when to use a supervision strategy or when to spawn a process from within a process that is supervised. That is because I don't know how/if it's possible in a supervision strategy to pass Christian Czura 2008-08-28T07:46:27 http://comments.gmane.org/gmane.comp.lang.erlang.general/32511 What is the supported way to build a 64-bit R12B-3 on Solaris 10/OpenSolaris? I'm asking because I have gotten a version to work, by specifying CC='gcc -m64' LD=$CC when configuring, and then fixing up the < at >DED_LD< at > things in the common_test rx driver by hand. This has worked fine for a large variety of things including our own linked-in drivers. Unfortunately today I discovered that they way the the crypto_drv gets built it does not work correctly doesn't load. Any direction on the "right way" to build 64-bit version for solaris, or what others have done would be appreciated. -- paul Paul Fisher 2008-08-28T18:48:09 http://comments.gmane.org/gmane.comp.lang.erlang.general/32508 I got to thinking about records and structs, and this lead me to think about the behaviour of term_to_binary .. term_to_binary has a misfeature that would cause problems in implementing dynamic records. term_to_binary does not efficiently encode shared data structures. This is best illustrated by an example: Consider this -module(test3). -compile(export_all). test() -> Big = lists:duplicate(1000,a), X = {Big}, Y = {Big,Big,Big,Big}, {sizeOf(Big),sizeOf(X), sizeOf(Y)}. sizeOf(T) -> size(term_to_binary(T)). Look what happens when we run this: 1> c(test3). {ok,test3} 2> test3:test(). {4007,4009,16027} The third number in this tuple surprises me. I had expected it to be 12 bytes larger than 4009. Internally Y is a pointer to four words (an arity tag, with value 4), then 4 identical pointers. But the fact that sizeOf(Y) is four times sizeOf(X) means that shared sub-structures in Erlang terms do not become shared in the binary representation of the term. Since term_to_binary and binary Joe Armstrong 2008-08-28T18:47:25 http://comments.gmane.org/gmane.comp.lang.erlang.general/32501 Bill McKeeman 2008-08-28T02:22:44 http://comments.gmane.org/gmane.comp.lang.erlang.general/32497 Bill McKeeman 2008-08-27T23:03:19 http://comments.gmane.org/gmane.comp.lang.erlang.general/32489 I need a java node to be reachable from some erlang processes and I want to do the equivalent of a global register to register a mailbox in the java node. Then the erlang code can send messages to that mailbox. Is this possible.?? I am fairly new to erlang, and only just started with JInterface. Thanks in advance. Mark. Mark Geib 2008-08-27T15:48:51 http://comments.gmane.org/gmane.comp.lang.erlang.general/32488 I need a java node to be reachable from some erlang processes and I want to do the equivalent of a global register to register a mailbox in the java node. Then the erlang code can send messages to that mailbox. Is this possible.?? I am fairly new to erlang, and only just started with JInterface. Mark Geib 2008-08-27T15:38:49 http://comments.gmane.org/gmane.comp.lang.erlang.general/32483 Suppose I have -record(foo, { bar, baz }). I understand that I can do record_info(fields, foo) and get a list of fields at compile time. Is there a way to translate bar into 2 at compile time as well? Thanks, Joel -- wagerlabs.com Joel Reymont 2008-08-27T15:01:00 http://comments.gmane.org/gmane.comp.lang.erlang.general/32482 eduardo f 2008-08-27T10:36:56 http://comments.gmane.org/gmane.comp.lang.erlang.general/32479 I've just been looking at ISO/EIC DTR 13211-5:2007 "Prolog Multi-threading predicates". This is a proposed addition to the ISO Prolog standard, whose declared aim is "to promote the portability of multi-threaded Prolog applications". As I read through it, I felt sicker and sicker and sicker. If any of you are parents, you may know the feeling when a child is being naughty and seems to be going out of his/her way to do things that are OBVIOUSLY to his/her detriment. I've boiled my reactions down to "here is a short list of design principles, every single one of which is violated by the proposal." Before sending them off to the ISO Prolog crowd, I thought I'd ask the opinion of Erlangers, especially Joe Armstrong, should he happen to read this. I concede that debugging tools may need to do all sorts of things that are otherwise risky. There are quite a few predicates in the 'erlang' module that are labelled as "debugging only". What I'm talking about is *core* facilities to be used in *normal* code that Richard A. O'Keefe 2008-08-27T04:47:21 http://comments.gmane.org/gmane.comp.lang.erlang.general/32476 Juan Jose Comellas 2008-08-26T22:44:22 http://comments.gmane.org/gmane.comp.lang.erlang.general/32471 Hi, there is a bug in inets/http_uri.erl in function parse_uri_rest, which first looks for '/' and then for '?' to get hostname and query params. This is not very good since some requests can have '/' after '?', which messes up the hostname. Example: (netskin< at >mars)15> http_uri:parse("http://ec2.amazonaws.com?Action=DescribeInstances&AWSAccessKeyId=XXX&SignatureVersion=1&Timestamp=2008-08-26T20:22:24&Version=2007-08-29&Signature=z%2FVynmrFTFe4dHtJlsPifSRtTLw%3D"). {http,[],"ec2.amazonaws.com",80,"/", "?Action=DescribeInstances&AWSAccessKeyId=XXX&SignatureVersion=1&Timestamp=2008-08-26T20:22:24&Version=2007-08-29&Signature=z%2FVynmrFTFe4dHtJlsPifSRtTLw%3D"} which is ok, hostname is "ec2.amazonaws.com", but now: (netskin< at >mars)29> http_uri:parse("http://ec2.amazonaws.com?Action=AuthorizeSecurityGroupIngress&AWSAccessKeyId=XXX&CidrIp=0.0.0.0/6&FromPort=0&GroupName=test&IpProtocol=tcp&SignatureVersion=1&Timestamp=2008-08-26T19:41:13&ToPort=65535&Version=2007-08-29&Signature=ClTihgpBO3%2BsMIlEDRem9AcZ6%2 karol skocik 2008-08-26T21:10:50 http://comments.gmane.org/gmane.comp.lang.erlang.general/32464 David Mercer 2008-08-26T18:24:33 http://comments.gmane.org/gmane.comp.lang.erlang.general/32463 What does this mean? dialyzer -c . --src --build_plt {dialyzer_error,[65,110,97,108,121,115,105,115,32,109,117, 115,116,32,98,101,32,100,111,110,101,32,111,110,32,98,121, 116,101,32,99,111,100,101,32,105,110,32,97,110,97,108,121, 115,105,115,32,109,111,100,101,32,"plt_build"]} [{dialyzer_options,check_output_plt,1}, {dialyzer_options,postprocess_opts,1}, {dialyzer_options,build,1}, {dialyzer_cl_parse,cl,1}, {dialyzer_cl_parse,start,0}, {dialyzer,plain_cl,0}, {init,start_it,1}, {init,start_em,1}] dialyzer: Internal problems were encountered in the analysis. %% from beam dialyzer -c . --build_plt Could not compute md5 for file: /Users/joelr/Work/openpoker/server/src/ betting.beam dialyzer: Internal problems were encountered in the analysis. Thanks, Joel -- wagerlabs.com Joel Reymont 2008-08-26T17:58:52 http://comments.gmane.org/gmane.comp.lang.erlang.general/32460 I'm new to Erlang, and I'm trying to use ESDL. I have it ESDL installed to /opt/local/lib/erlang/lib/esdl-0.96.0626/ (the default). But when I go to include ESDL in my .erl file I have to put it like like this -include(/opt/local/lib/erlang/lib/esdl-0.96.0626/include/sdl.hrl) otherwise it doesn't work (can't find the file). So I finally just used the absolute paths as mentioned above. But then it complains that it "sh: line 0: exec: sdl_driver: not found". What's the proper way to install a erlang module and to include it in a project. Is there a way to setup a search path? In Python it looks first in the current directory then in the site-packages directory of the Python install dir. Can anyone help me out? Timothy Timothy Baldridge 2008-08-26T14:30:45 http://comments.gmane.org/gmane.comp.lang.erlang.general/32456 I'd like to submit a fairly small documentation patch, but I'm not sure how/where... What should I patch against? The man pages? Where should I post the patch? The erlang-patches list? Tim Fletcher 2008-08-26T11:20:14 http://comments.gmane.org/gmane.comp.lang.erlang.general/32453 From: "Bjorn Gustavsson" <bgustavsson< at >gmail.com> Does this also means, that even with a range where it seems to work, some values will never be returned, because of the gaps in the floating point representation? How many bits of randomness can I expect with a call to random:uniform(N)? ImRe Imre Palik 2008-08-26T08:26:26 http://comments.gmane.org/gmane.comp.lang.erlang.general/32446 Hi, I tried to generate some test data in the following way: -module(test_gen). -export([run/0]). loop(0) -> void; loop(I) -> HN = 99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999 9999999999999999999999999999999999999999999999999999999999999999999999999999999999999999 Imre Palik 2008-08-26T06:56:20 http://comments.gmane.org/gmane.comp.lang.erlang.general/32441 I'm wondering, perhaps I'm not looking in the right place, but the crypto application, along with the main erlang BIF's, don't seem to have the equivalent of Ruby's String#crypt() method. I've searched a bit, with no luck. Hopefully posting here will lead me in the right direction! Thank you in advance. Chris Blair 2008-08-26T05:54:46 http://comments.gmane.org/gmane.comp.lang.erlang.general/32433 I'm trying to use the queue module in Erlang by trying it out in the console. Here is what I tried and here are the results: 34> T1 = queue:new(). {[],[]} 35> queue:in("foo", T1). {["foo"],[]} 36> queue:in("bar", T1). {["bar"],[]} 37> queue:out(T1). {empty,{[],[]}} 38> queue:out(T1). {empty,{[],[]}} 39> queue:out(T1). {empty,{[],[]}} 40> queue:in("foo", T1). {["foo"],[]} 41> queue:out(T1). {empty,{[],[]}} What confuses me here is that I expected foo and bar to be somehow next to one another after inserting bar. Why is it that it's only foo? Also, I have another question. I would like a linked list in Erlang (similar to the STL list class in C++), is there something like that? It would be also nice if the individual elements in the said list could be accessed in a similar fashion as an array :) (don't know if this is possible). yoursurrogategod< at >gmail.com 2008-08-25T23:53:34 http://comments.gmane.org/gmane.comp.lang.erlang.general/32429 I'm connected to a remote server via SSH. I can run X11 apps such as xeyes and they work. But when I load up Erlang and run tv.start(). I do not see the usual interface. No errors are generated so it's hard to tell what is going on. Nothing in remote or local dmesg. Does anyone have any suggestions as to what might stop tv.start() from working without generating an error, or where I might find messages indicating what the problem is? Vik :v) Vik Olliver 2008-08-25T22:08:15 Search the mailing list at Gmane query http://search.gmane.org/?group=$group=gmane.comp.lang.erlang.general