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From: "Jan D." <jan.h.d@swipnet.se>
Newsgroups: gmane.emacs.devel
Subject: Re: Core dumps in redisplay.
Date: Mon, 28 Feb 2005 18:15:25 +0100
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> "Jan D." <jan.h.d@swipnet.se> writes:
>
>>>
>>> This sounds like normally only the main thread should ever be 
>>> touching
>>> interrupt_input_blocked, unless we have a bug.  Correct?  So we need
>>> not think about how to synchronize accesses to the variable, but
>>> rather make sure that no thread except the main thread will ever run
>>> code touching it.  Correct?
>>>
>>> A use of BLOCK_INPUT or UNBLOCK_INPUT outside of the main thread is a
>>> bug.  Correct?
>>
>> Yes times three.
>
> xmalloc uses BLOCK_INPUT.  BLOCK_INPUT is rather often used in alloc.c.

Yes, there is a check for main thread there also, see macros 
(UN)BLOCK_INPUT_ALLOC.

	Jan D.