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Re: [RFC][PATCH] _UC_TLSBASE for all ports
Matt Thomas <matt%3am-software.com@localhost> wrote:
> if you start using using another thread's stack, you are assuming
> the identity of that thread.
It is some part of its identity, but not all. Another important part of
the thread identity is given by pthread_self(). That is used to ensure
mutexes, locks and conditions work. If you screw pthread_self() as we
allow by default, horrible things happens. For instance, malloc can be
re-entered by two threads, leading to unpleasant crashes.
Having a thread to grab the stack of another one is harmless, and we
even have at least one program (glusterfs) that makes use of it. Messing
with value returned by pthread_self() will lead to chaos.
I just propose to add an option to avoid that. I have trouble to
understand why it meets such a resistance, since most of our ports
already have that option available. I just add missing bits.
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