The instructions in http://oss.oetiker.ch/rrdtool/prog/rrdthreads.en.html can be a guide.
But since even the threadsafe version of the rrdtool library does not provide threadsafe versions of rrd_fetch() and rrd_graph(), it is not possible to have a working php extension for rrdtool without fixing rrdtool itself. Kindest regards, Michael Bunk
pgpMLCCDSDvf6.pgp
Description: PGP signature