[Haskell-cafe] How does RTS judge that a STM transaction is blocked?

Robin Palotai palotai.robin at gmail.com
Wed Feb 4 13:42:32 UTC 2015

More detail would be helpful, but sounds like an infinite (Async?) thread.

    bracket (newStablePtr a) freeStablePtr (const $ wait a)

+google to find out why.

2015-02-04 13:59 GMT+01:00 Magicloud Magiclouds <
magicloud.magiclouds at gmail.com>:

> Hi,
>   I met an issue while I was using xhb. When a certain property of root
> window being changed, it was supposed to give me an AccessError. But
> actually I got "thread blocked indefinitely in an STM transaction" when I
> waitForEvent.
>   AFAIK, in xhb, it forks a thread to read what X server sends. Then parse
> and put it into a TChan. waitForEvent reads from the TChan.
>   It is reasonable to me that if X server did not send anything, then
> waitForEvent would be blocked. But apparently there are some other policies
> in RTS.
>   So what is that? And how should I debug it?
> --
> 竹密岂妨流水过
> 山高哪阻野云飞
> And for G+, please use magiclouds#gmail.com.
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