As suggested by Michael Banck on IRC I've been looking at Signals used
by both parts to see if they e.g. battle over SIGUSR?. However libgc
seems to use 32+{5,6} as signals on x86 FREEBSD __GLIBC__ at
least. Petr, Steven: any idea why this is? Are these signals fine for
kfreebsd glibc (signal.h says only 32,33 are reserved). ecl seems to use
SIGRTMIN+2 internally which should not be a problem. I failed to see so
far what signals are used by libgc on linux
glibc uses 32 and 33 normally and 34 for debuging of pthread library.
libgc have to use separate signals, 32+{5,6} satisfies this.
The SIGRTMIN and __SIGRTMIN are different, they used to be 68 and 65.
Petr