[Midnightbsd-cvs] src: libc/gen: Add an internal _once() method that works like

[laffer1 at midnightbsd.org]

Log Message:
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Add an internal _once() method that works like pthread_once(3) but safe for libc routines.  This is safe to use in single threaded and multithreaded processes.

Obtained from: FreeBSD (SVN 200649)

Modified Files:
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    src/lib/libc/gen:
        Makefile.inc (r1.3 -> r1.4)
        (http://cvsweb.midnightbsd.org/src/lib/libc/gen/Makefile.inc?r1=1.3&r2=1.4)
    src/lib/libc/include:
        libc_private.h (r1.3 -> r1.4)
        (http://cvsweb.midnightbsd.org/src/lib/libc/include/libc_private.h?r1=1.3&r2=1.4)

Added Files:
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    src/lib/libc/gen:
        _once_stub.c (r1.1)
        (http://cvsweb.midnightbsd.org/src/lib/libc/gen/_once_stub.c?rev=1.1&content-type=text/x-cvsweb-markup)