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X-HELO: calimero.vinschen.de
Date: Wed, 21 Oct 2015 12:53:00 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Jemalloc under CYGWIN
Message-ID: <20151021105300.GN5319@calimero.vinschen.de>
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On Oct 16 23:56, Yucong Sun wrote:
> Hi,
>=20
> Throught some frustrating and furious debugging I now understand the
> core issue here.  CYGWIN calls malloc provided by jemalloc during
> initializations,  which in turn calls pthreads functions, which in
> turn uses malloc, which also uses pthreads, causing a deadlock.
>=20
> Now,  is there anyway to workaround this issue?

Not quickly, at least.  I looked into thread.cc and pthread.cc and
only found two uses of malloc, one of them should only occur when
pthread_exit'ing the main thread, the other in pthread_getattr_np.
The first shouldn't matter to jemalloc (or, does it?), the second
one I just eliminated.

What exactly is the malloc problem you're seeing?

In the long run it would be very nice if we could get jemalloc working
as the default malloc implementation in Cygwin, replacing dlmalloc.
This would allow to get rid of the slow global locking in malloc_wrapper.cc.

Historical note: At one point I tried to integrate ptmalloc3, but it
always had some unwanted side-effects and fixing them would have been
very complicated at the time.


So, if you're looking into getting jemalloc into Cygwin, feel free
to discuss this further on the cygwin-developers mailing list.


Thanks,
Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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