Native threads. Enabled by default on x86[-64] Linux only, also
available on x86[-64] Max OS X, x86[-64] FreeBSD, x86 Solaris,
and PPC Linux.
Native threads. Enabled by default on x86[-64] Linux only, also
available on x86[-64] Max OS X, x86[-64] FreeBSD, x86 Solaris,
and PPC Linux.