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    SubjectRe: Thread and process dentifiers (CPU affinity, kill)
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    On 20 May 2005, Lennart Sorensen prattled cheerily:
    > Maybe Debian compiled their glibc to not do NPTL on i386 yet. Not sure.

    This is not the case. Proof from ps -FT output:

    mysql 8473 8473 8472 0 29110 14056 0 May22 pts/1 /usr/sbin/mysqld
    mysql 8473 8475 8472 0 29110 14056 0 May22 pts/1 /usr/sbin/mysqld
    mysql 8473 8476 8472 0 29110 14056 0 May22 pts/1 /usr/sbin/mysqld
    mysql 8473 8477 8472 0 29110 14056 0 May22 pts/1 /usr/sbin/mysqld
    mysql 8473 8478 8472 0 29110 14056 0 May22 pts/1 /usr/sbin/mysqld
    mysql 8473 8479 8472 0 29110 14056 0 May22 pts/1 /usr/sbin/mysqld
    mysql 8473 8480 8472 0 29110 14056 0 May22 pts/1 /usr/sbin/mysqld
    mysql 8473 8481 8472 0 29110 14056 0 May22 pts/1 /usr/sbin/mysqld
    mysql 8473 8482 8472 0 29110 14056 0 May22 pts/1 /usr/sbin/mysqld

    > Hmm, after checking, it turns out if you use errno in your program, it
    > drops to linuxthreads, while using #include <errno.h> makes it able to
    > use NPTL when using 2.6 kernel.

    This is a distribution-specific patch. glibc as shipped by the FSF simply
    refuses to run programs that reference the errno symbol: errno is no
    longer an exported symbol at all. (This is reasonable, as such programs
    would fail to work on a multithreaded NPTL program in any case.)

    The only valid way to gain access to the errno symbol is to
    #include <errno.h>. This has been true for as long as glibc2 has existed.

    --
    `Once again, I must remark on the far-reaching extent of my
    ladylike nature.' --- Rosie Taylor
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