kMaxThreads=100 is rather low for Native Client

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The seccomp sandbox allocates per-thread data structures on startup,
so the maximum number of threads is fixed at startup.  This is set via
kMaxThreads, which is currently set to 100.

This is a bit low for Native Client.  Currently we support 8180
threads on Linux, 2556 on Mac OS X, and at least 900 on Windows (see
tests/egyptian_cotton/nacl.scons).  The maximum number of threads is
visible to untrusted code.  While we don't guarantee any number, 100
is a bit low compared with what we support currently.

See also issue 7.

Original issue reported on code.google.com by mseaborn@chromium.org on 1 Oct 2010 at 12:06