[go-nuts] Re: Static race detector?

On Tuesday, 13 September 2016 09:15:57 UTC+3, Egon wrote: > > On Tuesday, 13 September 2016 08:53:39 UTC+3, josvazg wrote: >> >> Why does Go does not have a static race detector? What are the >> difficulties? >> (just pointing me to the right docs to read is fine) >> >> I was thinking in a naive

[go-nuts] Re: Static race detector?

On Tuesday, 13 September 2016 08:53:39 UTC+3, josvazg wrote: > > Why does Go does not have a static race detector? What are the > difficulties? > (just pointing me to the right docs to read is fine) > > I was thinking in a naive high level way... > > If Rust can do it, using its ownership model,

Re: [go-nuts] Static race detector?

On Tue, Sep 13, 2016 at 7:53 AM josvazg wrote: > Why does Go does not have a static race detector? What are the difficulties? For example, the halting problem. Ok, now seriously. > If Rust can do it, using its ownership model, Go could have a tool checking the AST that analyzes variable scopes

[go-nuts] Static race detector?

Why does Go does not have a static race detector? What are the difficulties? (just pointing me to the right docs to read is fine) I was thinking in a naive high level way... If Rust can do it, using its ownership model, Go could have a tool checking the AST that analyzes variable scopes and che

[go-nuts] Re: Two Related Questions. (1) Map Concurrency (2) Making Multidimensional Arrays

On Tuesday, 13 September 2016 06:31:20 UTC+3, davidmi...@gmail.com wrote: > > I've spent many, many, many hours on this (measured in days, at this > point) and I'm convinced that Golang is missing a fundamental programming > capability, that of multidimensional associative arrays. Searching thr

[go-nuts] Re: Two Related Questions. (1) Map Concurrency (2) Making Multidimensional Arrays

2016. szeptember 13., kedd 4:01:24 UTC+2 időpontban davidmi...@gmail.com a következőt írta: > > My response is inline. > > On Monday, September 12, 2016 at 4:13:10 PM UTC-4, Tamás Gulácsi wrote: >> >> TL;DR >> I know what concurrency is. >> > > ok, but I wasn't explaining concurrency to you.

[go-nuts] Re: Two Related Questions. (1) Map Concurrency (2) Making Multidimensional Arrays

2016. szeptember 13., kedd 3:50:45 UTC+2 időpontban davidmi...@gmail.com a következőt írta: > > My response is inline. > > On Monday, September 12, 2016 at 7:43:12 PM UTC-4, Keith Randall wrote: >> >> Tamás's suggestion of using [4]string as the key is a good one. You >> could use any stru

Re: [go-nuts] Cross-compilation of golang assembly via 'go tool asm'

On Monday, September 12, 2016 at 9:58:58 PM UTC-6, Michael Hudson-Doyle wrote: > > > > On 13 September 2016 at 13:43, > wrote: > >> I'm implementing cross-compilation support in rules_go >> . This takes a low-level >> approach to building golang targets

Re: [go-nuts] Re: Two Related Questions. (1) Map Concurrency (2) Making Multidimensional Arrays

Another way that you can use (based on a recursive map[string]T - where T is an interface type - can be seen here where I use it create a filesystem of arbitrary behaviours). https://github.com/ev3go/sisyphus The general case though uses map[string]interface{}. Each time you want to add a layer a

Re: [go-nuts] How Golang implements slice?

On Mon, Sep 12, 2016 at 8:17 PM Fei Ding wrote: > Hi guys: > > I met a problem when I try to understand slice when using as function > parameters. After writing some code, I made a conclusion by myself, but > need some real check and explanation here, with your help. > > As far as I know, Golang'

Re: [go-nuts] Cross-compilation of golang assembly via 'go tool asm'

On 13 September 2016 at 13:43, wrote: > I'm implementing cross-compilation support in rules_go > . This takes a low-level > approach to building golang targets that involves use of the individual > toolchain components such as 'go tool asm', 'go tool compi

[go-nuts] Re: Oops ! i thought 'go' would be an easy to use programming language like BASIC or Scratch ( ! )

I'm sorry you've not enjoyed Go. How to uninstall Go will depend on how you installed it. I'll give tree options, if they do not apply, please reply with more detail about how you installed Go. 1. If you installed Go via homebrew, which is quite common, use the brew command to uninstall Go 2. I

Re: [go-nuts] Re: Two Related Questions. (1) Map Concurrency (2) Making Multidimensional Arrays

On Mon, 2016-09-12 at 20:26 -0700, davidmiller...@gmail.com wrote: > Well, PHP is also free. It can do multidimensional associative arrays > and much more. What good is Golang's tremendous efficiency if it isn't > capable of doing what is needed in the first place? Depends on how much work you wa

Re: [go-nuts] parsing millisecond coming after colon

As Dave said, you should check the error, but unfortunately I think you'll find that time.Parse doesn't handle fractional seconds that use a character other than . as a decimal separator. One possible workaround would be to replace all the : with . first: https://play.golang.org/p/h_IMQxtoVI -Ca

[go-nuts] std.flag require noname-flag support

Hi all, I found that std.flag require noname-flag support. For example: "ping 127.0.0.1 -n 2" and "ping 127.0.0.1 /n 2" are legal windows "ping" command line usages, but std.flag does not support these formats. Moreover, I found std.flag has a suspect BUG: I think "ping 127.0.0.1 -n = 2" or "pin

Re: [go-nuts] Best way to extract hostname from "host" or "host:port" style?

There is probably some code here ( https://github.com/golang/go/commit/1ff19201fd898c3e1a0ed5d3458c81c1f062570b) you can lift until go1.8 comes out. On Mon, Sep 12, 2016 at 8:17 PM Jonathan Yu wrote: > Hi, > > I tried searching Google, but didn't find anything. I'm probably just > missing someth

[go-nuts] Re: Two Related Questions. (1) Map Concurrency (2) Making Multidimensional Arrays

I've spent many, many, many hours on this (measured in days, at this point) and I'm convinced that Golang is missing a fundamental programming capability, that of multidimensional associative arrays. Searching through this forum's archives and other sites, I've found that I'm not the first one

[go-nuts] parsing millisecond coming after colon

You're ignoring the error from time.Parse, that will tell you what went wrong. -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegrou

Re: [go-nuts] Re: Two Related Questions. (1) Map Concurrency (2) Making Multidimensional Arrays

Thank you for clarifying. My response is inline. On Monday, September 12, 2016 at 11:20:10 PM UTC-4, kortschak wrote: > > On Mon, 2016-09-12 at 20:06 -0700, davidmi...@gmail.com > wrote: > > If I understand that correctly, my index key is now "Folder_1 > > Folder_2 > > Folder_3 Folder_4"

Re: [go-nuts] Re: Two Related Questions. (1) Map Concurrency (2) Making Multidimensional Arrays

On Mon, 2016-09-12 at 20:06 -0700, davidmiller...@gmail.com wrote: > If I understand that correctly, my index key is now "Folder_1 > Folder_2 > Folder_3 Folder_4" and my value is now "File_Name_1". How would I now > assign "File_Name_2" to Folder_2, for example? The key would be []string{"Folder

[go-nuts] How Golang implements slice?

Hi guys: I met a problem when I try to understand slice when using as function parameters. After writing some code, I made a conclusion by myself, but need some real check and explanation here, with your help. As far as I know, Golang's function parameters are passed by value, and slice could

[go-nuts] parsing millisecond coming after colon

Hi, I am trying to parse time coming in "6/9/15 15:54:04:393 CST" format. Note : before millisecond. When there is dot before millisecond, time.parse is working fine.. but when there is : before millisecond, time.parse does not work. am I missing anything? I tried the following package main

[go-nuts] Cross-compilation of golang assembly via 'go tool asm'

I'm implementing cross-compilation support in rules_go . This takes a low-level approach to building golang targets that involves use of the individual toolchain components such as 'go tool asm', 'go tool compile', 'go tool link', etc... Cross-compilatio

[go-nuts] Oops ! i thought 'go' would be an easy to use programming language like BASIC or Scratch ( ! )

Now that it turns out to be some kind of crazy Assembler Code for Terminal, i would like to delete it, But the Brief and cursory instructions for how to do this; Assumes that i am already fluent in Unix or Whatever ? Could someone provide me with instructions for how to remove it; for a 6_year o

[go-nuts] Linux SYS_SETGROUPS problem in forkAndExecInChild?

I think that golang on Linux ARM is inappropriately using the 16bit variant of the setgroups syscall when using exec. I've been having problems with setting additional groups on a Linux ARM system with a statement like this: groups = []uint32{20, 21} cmd.SysProcAttr.Credential = &syscall.Credent

[go-nuts] Best way to extract hostname from "host" or "host:port" style?

Hi, I tried searching Google, but didn't find anything. I'm probably just missing something obvious here, but I'm relatively new to Go - please bear with me :) In URLs (of the net/url variety), the Host field may be either a hostname or host/port combination. In the combined host/port case, w

Re: [go-nuts] Re: add default implementation to interfaces ( similar to abstract class in java)

Agreed, that said I'm still unclear while implementing interface, is it better to use anonymous or explicit interface embedding: That might help too: Abstract Classes in Go On Monday, 3 September 2012 14:25:59 UTC-

Re: [go-nuts] Re: Two Related Questions. (1) Map Concurrency (2) Making Multidimensional Arrays

Thank you for clarifying that, but how does that resolve my problem? The output I get is. map[[Folder_1 Folder_2 Folder_3 Folder_4]:File_Name_1] If I understand that correctly, my index key is now "Folder_1 Folder_2 Folder_3 Folder_4" and my value is now "File_Name_1". How would I now assi

Re: [go-nuts] Re: Two Related Questions. (1) Map Concurrency (2) Making Multidimensional Arrays

https://play.golang.org/p/6ZyybAKWpp On Mon, 2016-09-12 at 18:50 -0700, davidmiller...@gmail.com wrote: > I tried that. I can't seem to get it to work. I'm clearly doing > something > wrong, probably because I am misunderstanding Tamás's response. > > Test_Map := make(map[[4]string]string) > >

[go-nuts] Re: Two Related Questions. (1) Map Concurrency (2) Making Multidimensional Arrays

My response is inline. On Monday, September 12, 2016 at 4:13:10 PM UTC-4, Tamás Gulácsi wrote: > > TL;DR > I know what concurrency is. > ok, but I wasn't explaining concurrency to you. If you're referring to the paragraph about the cars, I was explaining why your answer was incorrect. I was

Re: [go-nuts] Re: Two Related Questions. (1) Map Concurrency (2) Making Multidimensional Arrays

*I already made your point in my previous post.* *"That's not to say that there aren't other potential bottlenecks being evaded by using concurrent routines that do no have the shared map problem."* *I think you made have taken my comment that "**Once you throw a shared bottleneck into

[go-nuts] Re: Two Related Questions. (1) Map Concurrency (2) Making Multidimensional Arrays

My response is inline. On Monday, September 12, 2016 at 7:43:12 PM UTC-4, Keith Randall wrote: > > Tamás's suggestion of using [4]string as the key is a good one. You could > use any struct you want as well, if you want to name the parts of the key. > I tried that. I can't seem to get it to

Re: [go-nuts] Multiple-reader single-writer map access - is this lockless workaround safe?

If you have a data race, you lose a lot of guarantees about the correct operation of your program. It may work today but fail occasionally, or a future version of the compiler may break it very badly. See https://software.intel.com/en-us/blogs/2013/01/06/benign-data-races-what-could-possibly-go-w

Re: [go-nuts] Multiple-reader single-writer map access - is this lockless workaround safe?

Thanks all. "Plain assignment" is not quite the full story actually - as I mentioned originally there's also a channel in use to wake up the painter thread. So in terms of memory model what I'm doing is more like: x.myMap = newMap x.refresh <- nil // i don't think it matters what value i

Re: [go-nuts] Re: Assigning +Inf to a float32 ..

On Monday, 12 September 2016 23:39:09 UTC+1, Michael Jones wrote: > > Actually, you would also want a way to say “which type of NaN” as there > are two classes and several subclasses. I wrote code for this a while back > and posted it here (IIRC). > > > yes -I'm aware of 'signalling' and 'quie

[go-nuts] Re: Another divide by zero (float) question

I see - so if I understood correctly the spec for constants disallowing divide by zero has accidentally been applied to divide by zero for float32s Does this mean there will be a fix at some distant point ? -- You received this message because you are subscribed to the Google Groups "golang-nu

[go-nuts] How example can be run in test?

Hi there, I'm trying to run example in test. However after running, warning is shown. ``` testing: warning: no tests to run ``` This example code include // Output comment. ``` func ExampleMethod1() { fmt.Printf("result: %x", Method1()) // Output: } ``` What is wrong? When running test, I

Re: [go-nuts] Re: Two Related Questions. (1) Map Concurrency (2) Making Multidimensional Arrays

On Tue, Sep 13, 2016 at 7:42 AM wrote: > > *One of the primary benefits of concurrency is that if one procedure gets > stuck or slows down, other procedures can keep moving along, evading the > bottleneck. Once you throw a shared bottleneck into the concurrent > routines, one loses out on the ben

[go-nuts] Re: Two Related Questions. (1) Map Concurrency (2) Making Multidimensional Arrays

Tamás's suggestion of using [4]string as the key is a good one. You could use any struct you want as well, if you want to name the parts of the key. How are you using the map? If you're only reading the map, then concurrent access is allowed. Concurrent access is only forbidden if one of the

[go-nuts] Re: make a struct pointer _not_ implement an interface

I don't believe this is possible. See the spec on method sets[1]. The excerpt I'm looking at: > The method set of any other type T consists of all methods > declared with receiver > type T. The method set of the corresponding pointer type >

Re: [go-nuts] Re: Assigning +Inf to a float32 ..

Actually, you would also want a way to say “which type of NaN” as there are two classes and several subclasses. I wrote code for this a while back and posted it here (IIRC). From: on behalf of Date: Sunday, September 11, 2016 at 6:32 AM To: golang-nuts Cc: Subject: Re: [go-nuts] Re: Assig

Re: [go-nuts] Multiple-reader single-writer map access - is this lockless workaround safe?

On Monday, 12 September 2016 12:04:30 UTC-4, sqweek E. wrote: > > Yes, through plain assignment. What problems arise from that? > Here's the general form of the problem. In the code below, one goroutine (f) creates a variable, initializes it (x=1), then shares its address with another goroutine

[go-nuts] make a struct pointer _not_ implement an interface

Is it possible to have a struct that implements an interface, but have pointers to the struct not implement the interface? The reason is that I want to find all the places in our codebase that attempt to use a pointer to a certain struct as a certain interface. -- You received this message becaus

[go-nuts] Re: Two Related Questions. (1) Map Concurrency (2) Making Multidimensional Arrays

TL;DR I know what concurrency is. For a map access, if you hold the lock for as few instructions as possible, it shouldn't hurt much. If you're after an idea of the best solution, that will be harser - maybe not a map is the best answer for your specific use case, but a slice. Or a slice of maps

[go-nuts] C Syscall Memory Code Review

Can you please review the code here: https://play.golang.org/p/Yk6nqHhtTo This forms the basis of a "memory" package which I am using on Windows to do interoperability with some C APIs. These existing C APIs sometimes take/return a C-null terminated pointer and sometimes they take/return a poi

[go-nuts] Re: Two Related Questions. (1) Map Concurrency (2) Making Multidimensional Arrays

*Thank you for responding. My response has been placed inline, below.* On Monday, September 12, 2016 at 8:08:28 AM UTC-4, Tamás Gulácsi wrote: > > > > 2016. szeptember 12., hétfő 7:28:26 UTC+2 időpontban davidmi...@gmail.com > a következőt írta: >> >> *I have two Golang questions that I hope

Re: [go-nuts] Re: [ANN] A Go based map reduce system (second attempt)

Perhaps something like this? https://github.com/pachyderm/chess mån 12 sep. 2016 kl 18:32 skrev David Crawshaw : > The map-reduce systems I've worked with in the past bundle up the map > and reduce functions in a binary, distribute it, and then communicate > with it by an IPC or RPC system. Th

Re: [go-nuts] Re: [ANN] A Go based map reduce system (second attempt)

The map-reduce systems I've worked with in the past bundle up the map and reduce functions in a binary, distribute it, and then communicate with it by an IPC or RPC system. This lets them take advantage of the operating system to control resource allocation. (Given how popular containers are becomi

Re: [go-nuts] Multiple-reader single-writer map access - is this lockless workaround safe?

All memory operations are unsafe for concurrent goroutines unless explicitly noted otherwise. In practice, if you have multiple goroutines accessing the same memory, you need to protect it with the primitives available to you in package sync or sync/atomic. Please review https://golang.org/ref/mem

Re: [go-nuts] Multiple-reader single-writer map access - is this lockless workaround safe?

That's still a data race. Are you using the race detector? On Mon, Sep 12, 2016 at 9:04 AM, sqweek E. wrote: > Yes, through plain assignment. What problems arise from that? > > On Monday, September 12, 2016 at 11:21:05 PM UTC+8, Peter Bourgon wrote: >> >> How are you replacing the reference to th

Re: [go-nuts] Multiple-reader single-writer map access - is this lockless workaround safe?

Yes, through plain assignment. What problems arise from that? On Monday, September 12, 2016 at 11:21:05 PM UTC+8, Peter Bourgon wrote: > > How are you replacing the reference to the original map? If you're > just using plain assignment e.g. x.myMap = newMap then that's not > safe. You could use

[go-nuts] Re: Multiple-reader single-writer map access - is this lockless workaround safe?

You might be interested in this: https://golang.org/pkg/sync/atomic/#Value Le lundi 12 septembre 2016 17:04:39 UTC+2, sqweek E. a écrit : > > Ok so after getting away with using maps to share data between threads for > a lng time, I've finally seen the light and accepted that this is not >

Re: [go-nuts] Multiple-reader single-writer map access - is this lockless workaround safe?

How are you replacing the reference to the original map? If you're just using plain assignment e.g. x.myMap = newMap then that's not safe. You could use sync/atomic.Value if you always made sure to do map reads via the Load method. On Mon, Sep 12, 2016 at 5:04 PM, sqweek E. wrote: > Ok so after g

[go-nuts] Multiple-reader single-writer map access - is this lockless workaround safe?

Ok so after getting away with using maps to share data between threads for a lng time, I've finally seen the light and accepted that this is not safe. In my case the threads in question are a painter thread and a mouse/keyboard event processing thread. They want to share data because obvio

[go-nuts] Re: Why is there no " declared and not used" compile error?

On Monday, 12 September 2016 08:57:15 UTC-4, Markus Zimmermann wrote: > > Hi gophers! > > I am wondering why we have a "declared and not used" compile error for > variables [https://play.golang.org/p/KLzHVO5L7q] but not for constants [ > https://play.golang.org/p/JG9dSa_VKg]? I am sure there is so

[go-nuts] Why is there no " declared and not used" compile error?

Hello, Const values can be accesed still by reflection in a reasonable manner. This question has come by quite a few times before on the mailing list, better explanations should be easy to find. -- You received this message because you are subscribed to the Google Groups "golang-nuts" group.

[go-nuts] Why is there no " declared and not used" compile error?

Hi gophers! I am wondering why we have a "declared and not used" compile error for variables [https://play.golang.org/p/KLzHVO5L7q] but not for constants [https://play.golang.org/p/JG9dSa_VKg]? I am sure there is some rational decision behind this that I have missed, but my Google-fu is just no

[go-nuts] Re: Two Related Questions. (1) Map Concurrency (2) Making Multidimensional Arrays

2016. szeptember 12., hétfő 7:28:26 UTC+2 időpontban davidmi...@gmail.com a következőt írta: > > *I have two Golang questions that I hope someone could help me out with.* > > > *1) Am I misunderstanding Golang maps?* > > > *I'm trying to translate a project from PHP to Golang for the websockets

Re: [go-nuts] What 5 things does Go need in 2017?

s/hilarious/sad/ If I had a pound for every time I've had to create custom packages/repos for various languages, libraries and apps... I could buy myself a fancy dinner or two. Mon, 12 Sep 2016 at 08:21, Dave Cheney wrote: > Distros are always out of date, sometimes hilariously. Official in my

Re: [go-nuts] What 5 things does Go need in 2017?

Go doesn't need anything. You just need to write more code ;) On Sun, Sep 11, 2016 at 6:43 PM, Mark Richman wrote: > I'm somewhat new to the community, and seek to understand its challenges > better. I'm also looking for opportunities to contribute. > > To that end, what 5 things does Go need in

Re: [go-nuts] What 5 things does Go need in 2017?

On 12 September 2016 at 21:53, Dave Cheney wrote: > Ubuntu 12.04 LTS ships with Go 1.0. > Ubuntu 14.04 LTS ships with Go 1.2 > Ubuntu 16.04 LTS ships with Go 1.6 (I hope) > Yeah, 1.6 got into 16.04. > None of the LTS versions of Ubuntu ship with a supporter version of Go. > This is a policy de

Re: [go-nuts] What 5 things does Go need in 2017?

But fedora for example is stuck on 1.6 until fedora 25 is released, its a simular situation to elasticsearch, distro version is old, and has severe limitations, nobody in thier right mind would install from there. Far far safer to use the official version fom the elastic.co site. The same is true

Re: [go-nuts] What 5 things does Go need in 2017?

Especialy since the distros often lag the release cycle by quite a bit. 1.7.x is not due on Fedora until release 25, which is several months away. On 12 Sep 2016 09:58, "Dave Cheney" wrote: An 'official' deb/apt/yum repo for Go would be much appreciated, https://github.com/golang/go/issues/10965

Re: [go-nuts] A compatible extension to the for construct

On 9/12/16, Ian Lance Taylor wrote: > > My guess as to what this means is that it is precisely equivalent to > for x++; x < n; x++ { > I can't argue with your analysis, it seems flawless and I didn't spot that. I'm going to go back where I thought continue would be the only sensible option and

Re: [go-nuts] What 5 things does Go need in 2017?

Some distros suffer less from this. Arch is perfectly up2date in line with its rolling approach. I agree with Dave that a supported repo is very nice. It is not unusual for companies to lag behind even on LTS installs but still having a need for updates of a particular software. mån 12 sep. 201

Re: [go-nuts] What 5 things does Go need in 2017?

Ubuntu 12.04 LTS ships with Go 1.0. Ubuntu 14.04 LTS ships with Go 1.2 Ubuntu 16.04 LTS ships with Go 1.6 (I hope) None of the LTS versions of Ubuntu ship with a supporter version of Go. This is a policy decision by Ubuntu. What Go needs is an official repo, just like Chrome has. > On 12 Sep 2

Re: [go-nuts] What 5 things does Go need in 2017?

On Mon, 2016-09-12 at 17:21 +1000, Dave Cheney wrote: > Distros are always out of date, sometimes hilariously. Official in my > parlance means "from the go team" If the official distro repository is not as up-to-date as is should be then fix it, either by helping the current packagers or by becomi

Re: [go-nuts] What 5 things does Go need in 2017?

Distros are always out of date, sometimes hilariously. Official in my parlance means "from the go team" > On 12 Sep 2016, at 17:06, Russel Winder wrote: > >> On Sun, 2016-09-11 at 18:58 -0700, Dave Cheney wrote: >> An 'official' deb/apt/yum repo for Go would be much >> appreciated, https://git

Re: [go-nuts] What 5 things does Go need in 2017?

On Sun, 2016-09-11 at 18:58 -0700, Dave Cheney wrote: > An 'official' deb/apt/yum repo for Go would be much  > appreciated, https://github.com/golang/go/issues/10965 > Go stuff is packaged for Debian and Fedora, they are the official Debian and Fedora packages. Any other packages in any other rep