Re: Wow. It all 'just works'
Related to the above: [GitHub starts blocking developers in countries facing US trade sanctions](https://www.zdnet.com/article/github-starts-blocking-developers-in-countries-facing-us-trade-sanctions/) Of course people with unpopular political opinions have been facing informal sanctions (ex. shadow-censorship) for years now, but a lot more people will soon have reasons to avoid major platforms like GitHub. It could include rather large nations like Russia and China...
Re: How to Maintain a Nim Chinese Community
Just curious, is IPFS taking off in Mainland China? I was thinking of thinking of possibly contemplating an IPFS mirror of the Nim ecosystem (git source code, Web-site snapshots, videos, binaries, etc).
Async socket to server connection error handling
Hello guys. Is there any way to find out if async socket _proc connect()_ has established a connection or not - it just returns Future[void] either way - or a proper way to handle refused connections? My program crashes when I call await socket.recvLine() Run for a socket where asyncCheck socket.connect(serverAddress, port.Port) Run did not established a connection i.e. random IP, but it **works** ok when I connect to my server which listens. I've tried to catch an Exception and OSError (shown in traceback) but it didn't work. Shown errors: Error: unhandled exception: A request to send or receive data was disallowed because the socket is not connected and (when sending on a datagram socket using a sendto call) no address was supplied. Exception message: A request to send or receive data was disallowed because the socket is not connected and (when sending on a datagram socket using a sendto call) no address was supplied. Exception type: [OSError] Run
Re: Tables - can't get the address of value
When im creating the faces, i know their exact number, but to speedup the rendering, I want to merge them by their common texture. I dont know the number of the merged faces, so I have to make one [loop trough all the faces](https://github.com/JDragan/CoreQ3BSP/blob/a9242fed0e603628b8c1e901a258a34edb899ad7/src/coreBSP.nim#L93) and find the number of unique texture/lightmap combinations. Then from this number i have the size of the render data (number of merged faces) Then I do another loop to fill the data. With tables I dont have to do that, I can do that in the first loop
Re: Tables - can't get the address of value
From:
[https://nim-lang.org/docs/manual.html#statements-and-expressions-the-addr-operator](https://nim-lang.org/docs/manual.html#statements-and-expressions-the-addr-operator)
> The addr operator returns the address of an l-value.
From:
[https://nim-lang.org/docs/manual.html#procedures-var-return-type](https://nim-lang.org/docs/manual.html#procedures-var-return-type)
> A proc, converter or iterator may return a var type which means that the
> returned value is an l-value and can be modified by the caller:
In other words, when a return type is not a var type, it is not an l-value.
From:
[https://nim-lang.org/docs/tables.html#%5B%5D%2CTable%5BA%2CB%5D%2CA](https://nim-lang.org/docs/tables.html#%5B%5D%2CTable%5BA%2CB%5D%2CA)
[https://nim-lang.org/docs/tables.html#%5B%5D%2CTable%5BA%2CB%5D%2CA_2](https://nim-lang.org/docs/tables.html#%5B%5D%2CTable%5BA%2CB%5D%2CA_2)
> proc `[]`[A, B](t: Table[A, B]; key: A): B
>
> proc `[]`[A, B](t: var Table[A, B]; key: A): var B
So in your `CreateBuffers` proc, `proc `[]`[A, B](t: Table[A, B]; key: A): B`
is called and it doesn't return var type. You can get an address only from an
l-value. That is why you cannt use `unsafeAddr` in your code.
You can not access `seq[0]` when the lenght of the sequence is 0.
I think your code shoulde be like:
proc CreateBuffers*(obj: var RenderableObject) {.inline.} =
# # #
glBufferData(GL_ARRAY_BUFFER, obj.vertices_tbl[f].len*sizeof(GLfloat), if
obj.vertices_tbl[f].len == 0: nil else: obj.vertices_tbl[f][0].unsafeAddr,
GL_STATIC_DRAW)
Run
> if I pass it with var like obj: var RenderableObject it works, but that kinda
> defeats the purpose of using tables and its very slow
I don't understand neither why you are using tables in your code nor why `var`
defeats the purpose of using tables only from your code.
Tables - can't get the address of value
I use table in type like:
type
RenderableObject* = object
vertices_tbl*: Table[int, seq[float32]]
indices_tbl*: Table[int, seq[uint32]]
# init
var FACE : RenderableObject
FACE.vertices_tbl = initTable[int, seq[float32]]()
FACE.indices_tbl = initTable[int, seq[uint32]]()
#init the seq
proc CreateFace(f: int, pos: int) =
if not hasKey(FACE.vertices_tbl, pos):
FACE.vertices_tbl[pos] = @[]
FACE.indices_tbl[pos] = @[]
Run
but in OpenGL function where i specify the container
proc CreateBuffers*(obj: RenderableObject) {.inline.} =
# # #
glBufferData(GL_ARRAY_BUFFER, obj.vertices_tbl[f].len*sizeof(GLfloat),
obj.vertices_tbl[f][0].unsafeAddr, GL_STATIC_DRAW)
# # #
Run
It says it cant get the address.
Is it because its not yet initialized? if I pass it with var like _obj: var
RenderableObject_ it works, but that kinda defeats the purpose and its very slow
Re: spawn/sync hangs -- any ideas?
There might be a deadlock. Can you compile with `--debugger:native` and attach gdb/lldb and do a backtrace if your programs hangs? Also you can maybe compile with `-d:useMalloc` and use helGrind to try to find threading errors: [http://valgrind.org/docs/manual/hg-manual.html](http://valgrind.org/docs/manual/hg-manual.html)
Re: spawn/sync hangs -- any ideas?
Even in my current program (runs in a second, but builds a lot of code), this hangs only 1 in 10 tries. It's a "Heisenbug", an intermittent multi-threading error. And it's almost certainly in Nim because my code spawns only 1 task.
Re: spawn/sync hangs -- any ideas?
@araq, if I don't call `threadpool.setMaxPoolSize(1)`, this always works. I think there is a bug in threadpool resizing, which is a must-have for me. Should I file a bug? I cannot provide a simple repro from my current codebase.
spawn/sync hangs -- any ideas?
What could cause sync() to hang?
for x in stage1:
spawn startStage1(x)
sync()
log("First sync() done.")
Run
proc startStage1(args: Stage1) =
log("StartProcess in Stage1: '", args.icmd, "'")
var p = startProcess(command = args.icmd, options = {poEvalCommand,
poStdErrToStdOut})
var argsx = args
argsx.sin = p.outputStream
doStage1(argsx)
log(" startStage1: p.close() ...")
p.close()
log(" startStage1: p.close() done")
Run
I see everything except "First sync() done."
This is all after `threadpool.setMaxPoolSize(1)`, and the size of the array is
`1`.
What could possibly prevent "sync()" from working. (Verified behavior with both
0.20.0 and 0.20.2.)
Re: What do you think about the programming language NIM?
Having curly braces {} and having to type semicolons every time; and more isn't
less readable to me either, but it does add extra unnecessary stuff to type.
Python style indentation(which to me is an upgrade from BASIC syntax which i
have used) makes it faster to write what you are aiming to. But you know that's
just an opinion D:.
Re: Roadmap Document?
Excellent - thanks - I'll take a look at it later this month.
Re: Roadmap Document?
Hot-reloading works but is still rough as it's not even 6 months old. You can probably already try building a REPL on top, but just make sure to not stay alone if you hit a bug, join the IRC/Gitter/Discord/Matrix. Alternatively for REPL you have * `nim secret`, unsupported secret command line option to get a limited REPL (it doesn't support anything that requires a C library) * `INim` \- [https://github.com/AndreiRegiani/INim](https://github.com/AndreiRegiani/INim), which works with plain raw Nim.
Re: Roadmap Document?
@mratsim On my to-do list for August is to take an initial look at Nim REPL options - so is the hot-loading work that was done recently still needing work to get a REPL going?
Re: Erroneous values returned from Nim’s C foreign function interface.
Judging from the c example you posted, your sizes are wrong. On my system utmpx is defined something like utmpx* = object ut_type*:ut_type # Type of record ut_pid*:cint # PID of login process ut_line*:array[UT_LINESIZE,char] # Device name of tty - "/dev/" ut_id*:array[4,char] # Terminal name suffix or inittab(5) ID ut_user*:array[UT_NAMESIZE,char] # Username ut_host*:array[UT_HOSTSIZE,char] # Hostname for remote login, or kernel version for run-level messages ut_exit*:cint # Exit status ut_session*:cint # Session ID (getsid(2)) ut_tv*:tv # Time entry was made */ ut_addr_v6*:array[4,int32] # Internet address of remote host; IPv4 address uses just ut_addr_v6[0] */ reserved:array[20, char] Run And you're calling inet_ntop with the wrong size arguments. Something like const UT_LINESIZE = 32 UT_NAMESIZE = 32 UT_HOSTSIZE = 256 INET6_ADDRSTRLEN = 46 proc getfromIP(ut:ptr utmpx):cstring= var buff: array[INET6_ADDRSTRLEN, char] result = inet_ntop(AF_INET,ut.ut_addr_v6[0].addr, buff[0].addr, INET6_ADDRSTRLEN) Run should work.
