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Re: [RFC][PATCH] _UC_TLSBASE for all ports
On Fri, Aug 10, 2012 at 10:19:03 -0700, Matt Thomas wrote:
> On Aug 10, 2012, at 9:58 AM, Joerg Sonnenberger wrote:
> > On Fri, Aug 10, 2012 at 04:36:17PM +0000, Emmanuel Dreyfus wrote:
> >> Summary of the previous episode: NetBSD's swapcontext restores the
> >> thread_self pointer. When using swapcontext() on a context obtained
> >> from getcontext() in another thread, this makes two threads with the
> >> same pthread_self, leading to chaos
> > I maintain that trying to move contexts between threads is an inherently
> > bad idea and that it is a very inefficient interface for implementing
> > coroutines. I object to this change for the sake of misdesigned
> > software.
> I concur. A thread's stack is its identity and one can't swap stacks
> without swapping its sense of self. (granted thread local storage
> helps but that isn't universally available).
I'm not sure it's possible to come up with coherent semantic for
mixing pthreads and *context functions in that way (even if stack is
not used as thread identity).
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