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2020-09-21 21:05:28 hackage ormolu 0.1.3.0 - A formatter for Haskell source code https://hackage.haskell.org/package/ormolu-0.1.3.0 (mrkkrp)
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2020-09-21 21:07:03 → Bill--Door joins (550112fd@253.18.1.85.dynamic.wline.res.cust.swisscom.ch)
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2020-09-21 21:09:47 <Bill--Door> How come the example in Control-Concurrent-STM-TChan doesn't type check? I don't quite understand how TChan works:
2020-09-21 21:10:13 <merijn> Which example?
2020-09-21 21:10:52 <Bill--Door> From what I've gathered in the docs, I want to use `newBroadcastTChanIO` and duplicate that for reads, but there's no `*IO` variant of `dupTChan`..
2020-09-21 21:10:54 <glguy> http://hackage.haskell.org/package/stm-2.5.0.0/docs/Control-Concurrent-STM-TChan.html#v:newBroadcastTChan
2020-09-21 21:11:11 <glguy> Use 'atomically' to turn STM into IO
2020-09-21 21:11:14 <Bill--Door> Yeah, that one.
2020-09-21 21:11:28 <merijn> oh, hah
2020-09-21 21:11:31 <glguy> You'll rarely use the IO variants; they exist for some special cases
2020-09-21 21:11:34 <Bill--Door> But then I always get `thread blocked indefinitely in an STM transaction`, tried that too
2020-09-21 21:11:39 <merijn> someone fucked up and missed an "atomically" in the example
2020-09-21 21:11:50 <merijn> Bill--Door: That means there's someone reading but no one can ever write
2020-09-21 21:11:56 <Bill--Door> So, I am doing it right oof
2020-09-21 21:11:57 <merijn> (or vice versa)
2020-09-21 21:12:39 <Bill--Door> Wait, will the reader not be blocked & wait until the write happens?
2020-09-21 21:12:54 × worc3131 quits (~quassel@2a02:c7f:c026:9500:7d0b:65d0:38a4:4786) (Remote host closed the connection)
2020-09-21 21:13:05 <glguy> The example exists as a demonstration of what *not* to do
2020-09-21 21:13:18 <glguy> a little less surprising that they didn't actually try to use it
2020-09-21 21:13:39 <merijn> Bill--Door: "thread blocked indefinitely" means "a thread blocked trying to read from a channel, but no thread can ever write to it because there are no other references"
2020-09-21 21:14:00 <merijn> i.e., "you wrote deadlocking code, but luckily we detected it"
2020-09-21 21:14:15 <Bill--Door> I'm not sure this is dead-locking: pastebin.com/fYq4B8XW
2020-09-21 21:14:30 → heatsink joins (~heatsink@107-136-5-69.lightspeed.sntcca.sbcglobal.net)
2020-09-21 21:15:21 <Bill--Door> Everyone has a neighbour and writes there, reads what they got and so on. Somehow it deadlocks, it should work?
2020-09-21 21:15:31 × cosimone_ quits (~cosimone@2001:b07:ae5:db26:b248:7aff:feea:34b6) (Quit: Quit.)
2020-09-21 21:15:57 → cosimone joins (~cosimone@2001:b07:ae5:db26:b248:7aff:feea:34b6)
2020-09-21 21:17:12 → rprije joins (~rprije@27.143.220.203.dial.dynamic.acc01-myal-dub.comindico.com.au)
2020-09-21 21:17:22 <merijn> Bill--Door: Eh, you never store 'c' and thus can't ever write to it
2020-09-21 21:17:25 → alp joins (~alp@2a01:e0a:58b:4920:154c:81bf:aad9:3bc2)
2020-09-21 21:17:39 <glguy> merijn: The c's are stored in chans
2020-09-21 21:17:39 <merijn> oh wait, the net does
2020-09-21 21:17:42 <glguy> which get put into net
2020-09-21 21:18:08 <glguy> though I still don't see why broadcast chans are being used at all yet
2020-09-21 21:18:32 <glguy> any chance this is related to AoC?
2020-09-21 21:18:35 × heatsink quits (~heatsink@107-136-5-69.lightspeed.sntcca.sbcglobal.net) (Ping timeout: 240 seconds)
2020-09-21 21:18:40 <Bill--Door> I do the `inbound <- atomically $ dupTChan c` and use `inbound` instead, like that example does
2020-09-21 21:18:50 <merijn> Where are they read, though?
2020-09-21 21:18:52 <glguy> Bill--Door: The example is showing you what not to do
2020-09-21 21:19:26 <Bill--Door> But even when I change to using `c` and `newTChanIO` which apparently leads to memory-leaks, it doesn't change
2020-09-21 21:19:32 <glguy> if you have one reader and one writer you don't need a broadcast chan
2020-09-21 21:19:44 <glguy> I mean:
2020-09-21 21:19:53 <Bill--Door> There might be multiple writers but single readers
2020-09-21 21:19:55 <glguy> if you have one reader (doesn't matter how many writters)
2020-09-21 21:20:03 <glguy> then you don't need a broadcast chan
2020-09-21 21:20:19 <merijn> glguy: If you never have 0 readers you don't need a broadcast chan
2020-09-21 21:20:26 <merijn> That's the real thing
2020-09-21 21:20:38 <glguy> the code never actually forks off all the listeners
2020-09-21 21:21:42 <Bill--Door> Oh, so I just use `c` from `newTChanIO`, but it still locks: pastebin.com/T2CBXMaM
2020-09-21 21:22:08 <glguy> You'll need to fork a thread per participant
2020-09-21 21:22:51 <Bill--Door> Oooh, crap
2020-09-21 21:23:07 <Bill--Door> I've been staring at this for way too long... thanks so much!
2020-09-21 21:23:44 × darjeeling_ quits (~darjeelin@122.245.219.58) (Ping timeout: 260 seconds)
2020-09-21 21:23:45 × carlomagno quits (~cararell@inet-hqmc02-o.oracle.com) (Ping timeout: 240 seconds)
2020-09-21 21:24:55 <glguy> Bill--Door: Is this homework? online challenge problem? something you're just making up?
2020-09-21 21:25:16 → carlomagno joins (~cararell@inet-hqmc02-o.oracle.com)
2020-09-21 21:26:04 <Bill--Door> Just making sth. up, why?
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