From owner-freebsd-threads@FreeBSD.ORG  Fri Jan 16 18:02:16 2004
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Date: Fri, 16 Jan 2004 21:02:14 -0500 (EST)
From: Daniel Eischen <eischen@vigrid.com>
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To: David Xu <davidxu@freebsd.org>
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Subject: Re: MINSIGSTKSZ and PTHREAD_STACK_MIN 
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On Sat, 17 Jan 2004, David Xu wrote:

> There is a conflict between MINSIGSTKSZ and PTHREAD_STACK_MIN,
> PTHREAD_STACK_MIN defined in pthread.h has a fixed value 1024,
> MINSIGSTKSZ is variable on per-architecture, on i386,  it is defined in
> sys/i386/include/signal.h:
> #define      MINSIGSTKSZ     (512 * 4)
> so on i386, makecontext is failed when user specifies PTHREAD_STACK_MIN
> for new thread,  result is we get following message in libkse:
> 
> Fatal error 'Thread has returned from _thread_switch' at line 1099 in file
>  /usr/home/davidxu/src/lib/libpthread/thread/thr_kern.c (errno = 0)
> 
> This becauses context is not fully initialized in pthread_create.
> 
> Either makecontext shouldn't check stacksize or we should synchoronize
> MINSIGSTKSZ and PTHREAD_STACK_MIN.

I think PTHREAD_STACK_MIN should also be per-architecture and be
>= MINSIGSTKSZ (otherwise threads wouldn't have enough stack to
handle signals).

-- 
Dan Eischen