More detail would be helpful, but sounds like an infinite (Async?) thread. Try bracket (newStablePtr a) freeStablePtr (const $ wait a) +google to find out why. 2015-02-04 13:59 GMT+01:00 Magicloud Magiclouds < magicloud.magiclouds@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
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