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Re: restartable system calls under Linux


"Dale P. Smith" <dpsm@en.com> writes:

> Greetings,
> 
> This is probably an autoconf bug instead of a Guile bug, but I thought I'd send it in anyway.
> 
> On my system, Linux kernel 2.2.14, autoconf detects that system calls are restartable.  When guile is configured without thread support, changing the size of an xterm window causes guile to return
> from a read() (and throw an error).  If the macro HAVE_RESTARTABLE_SYSCALLS is not #defined, this does not happen.
> 
> Autoconf detects restartable system calls by forking a process, and waiting on the child.  The child sends the parent an interrupt during the wait.  The code detects if the wait was restarted or not.
> 
> Would it be better to more closely simulate what's actually happening?  Something like sending an interrupt while doing a read?

If you (or someone else) give me a test which detects this situation,
I'll include it in Guile.  We'll use a combination of the autoconf
test and the new test, demanding both to succeed in order to exclude
the loop in the SCM_SYSCALL macro.

Preferably, you would write an autoconf test, but a small test program
is also OK.

Best regards,
/mdj

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