BUG: preemptive operation fails under libwww-5.1

Library: libwww-5.1
System: Solaris 2.5, sparc


I've had trouble getting preemptive operation to work under libwww-5.1;
the library hangs in a read after retrieving uncached documents.  I
don't think this is a bug on my part, as Library/Examples/chunk.c fails
in exactly the same way as my code, and my code used to work under

I'm working around it by running non-preemptively with an addAfter
filter which calls HTEventList_stopLoop() so I fall out of the event
loop, and hope to go properly non-preemptive eventually.