When "purifying" dxexec I couldn't help but notice billyuns and billyuns
of signal 48's... that's SIGPTRESCHED. Seems like a lot of kernel
activity for possibly not much benefit on a uniprocessor. I cut
-lpthread manually from the link line of dxexec-- to no ill effect.
Glancing at configure, if there is a pthread library, we link it. We
don't check to see if it is actually required. Buggy pthread
implementations are an exposure: pthreads seem to be an area of
frequent OS patches. Plus we are defaulting to e.g. cc not cc_r,
therefore we are counting on libc being libc_r. X must also be
thread-safe. These are not givens across platforms, as some prior
appends attest. What platforms require -lpthread? Should we exclude
-lpthread on systems that can link without it? What would the configure
test be?
