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Re: Lockup
From: |
YAMAMOTO Mitsuharu |
Subject: |
Re: Lockup |
Date: |
Fri, 11 Aug 2006 12:48:05 +0900 |
User-agent: |
Wanderlust/2.14.0 (Africa) SEMI/1.14.6 (Maruoka) FLIM/1.14.6 (Marutamachi) APEL/10.6 Emacs/22.0.50 (sparc-sun-solaris2.8) MULE/5.0 (SAKAKI) |
>>>>> On Thu, 10 Aug 2006 13:17:03 +0200, Jan Djärv <address@hidden> said:
>> My intention was that the above scenario would be avoided with
>> BLOCK_INPUT around functions that may call malloc-related
>> functions.
> It does not help if the calling thread is one of the Gnoem threads.
But a signal delivered to a non-main thread is redirected to the main
thread by SIGNAL_THREAD_CHECK.
>> How about just changing the order of lock/unlock and
>> BLOCK_INPUT/UNBLOCK_INPUT in the previous version of
>> BLOCK_INPUT_ALLOC/UNBLOCK_INPUT_ALLOC?
> That would mean that lock/unlock mutex functions are called in the
> signal handler context, which is not allowed according to the
> documentation.
Yes, pthread_mutex_(un)lock is not async-signal-safe. But we are
already using such functions as malloc in the signal handler context
(with the help of BLOCK_INPUT). I guess calling
pthread_mutex_(un)lock in the signal handler context is safe in
reality unless the interrupted thread is also executing
pthread_mutex_(un)lock for the same mutex. I think it's better than
the current one, i.e., not protecting shared resources such as
__malloc_hook in the signal handler context.
(Of course SYNC_INPUT is the right direction, but the current plan is
not enabling it in the next release as far as I understand.)
YAMAMOTO Mitsuharu
address@hidden
- Lockup, David Kastrup, 2006/08/01
- Re: Lockup, Jan Djärv, 2006/08/01
- Re: Lockup, Jan Djärv, 2006/08/10
- Re: Lockup, YAMAMOTO Mitsuharu, 2006/08/10
- Re: Lockup, Jan Djärv, 2006/08/10
- Re: Lockup, YAMAMOTO Mitsuharu, 2006/08/10
- Re: Lockup, Jan Djärv, 2006/08/10
- Re: Lockup,
YAMAMOTO Mitsuharu <=
- Re: Lockup, Jan Djärv, 2006/08/11
- Re: Lockup, YAMAMOTO Mitsuharu, 2006/08/11
- Re: Lockup, Jan Djärv, 2006/08/11
- Re: Lockup, YAMAMOTO Mitsuharu, 2006/08/11
- Re: Lockup, David Kastrup, 2006/08/11
- Re: Lockup, YAMAMOTO Mitsuharu, 2006/08/11