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
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