A way to build and install libpthread as 1:1 as well as M:N?

[Robert Watson]

I'm doing some stability and performance testing as part of the network
stack locking work.  I'd like a way to easily plug and play the
configuration of libpthread at run-time (although restarting apps is fine,
rebooting is less preferable, as is actually rebuilding!).  It looks like
right now if I want to switch the operating mode of libpthread to 1:1, I
have to recompile it with different compile options and have a separate
library floating around that I plug.  Could we arrange for it to be a
runtime switch of some sort (perhaps read once when the app starts), or
build the library both ways by default and intall with different names?

Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
robert at fledge.watson.org      Principal Research Scientist, McAfee Research