Christian Maeder wrote:
Ian Lynagh wrote:
I'm not sure why we have both HAVE_TIMER_CREATE and USE_TIMER_CREATE.
I'd like to know, too.
It's because the configure script checks for more than just the
existence of timer_create() (HAVE_TIMER_CREATE), it checks that it works
well enough to use (USE_TIMER_CREATE). Historical versions of Linux had
broken implementations of timer_create() that we need to avoid.
Unfortunately this means that taking a GHC binary built on a newer Linux
will not work on an older version.
timer_create() is needed so that we can avoid needing to use the SIGALRM
signal, which interferes with other things (there are previous tickets
on this, a search for SIGALRM should turn them up).
Cheers,
Simon
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