libpthread_dbg(3) deletion from the base distribution

libpthread_dbg(3) is a remnant library from the M:N thread model
(pre-NetBSD-5.0) API to introspect threads within a process and for use
of debu

libpthread_dbg(3) deletion from the base distribution

libpthread_dbg(3) is a remnant library from the M:N thread model
(pre-NetBSD-5.0) API to introspect threads within a process and for use
of debuggers.

Currently in the 1:1 model it's not used in GDB neither in LLDB and it's
not either planned to be used. It's current function to read pthread_t
structures is realizable within a regular debugger capable to
instrospect objects within a tracee (GDB, LLDB...).

Remaining users of this API can still use this library from
pkgsrc/devel/libpthread_dbg.

Sponsored by <The NetBSD Foundation>

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Add CAVEATS section:
Due to limitations in the current pthread implementation, makecontext(3)
and sigaltstack(2) should not be used in programs which link against
libpthread (whether threads are used

Add CAVEATS section:
Due to limitations in the current pthread implementation, makecontext(3)
and sigaltstack(2) should not be used in programs which link against
libpthread (whether threads are used or not).

Wording from drochner@ and ad@

Bump date for man pages.

Add note in libpthread/README so it's not forgotten to update the man
pages when the problem is fixed.

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Note that libpthread_dbg needs to be checked after making changes to
libpthread.

This incarnation of the pthreads library is ancient and not useful, and
should have been mothballed some time ago...

The latest pthread library.

Makefile needed a preall to make a few links before compiling sources.
CVS doesn't check in symlinks.

Initial release of the POSIX 1003.4a Draft 7 thread implementation.