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{$/\ast$\it{}$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$\mbox{}\\
$\ast$ FILE: hellodump.c\mbox{}\\
$\ast$ DESCRIPTION:\mbox{}\\
$\ast$   A "hello world" Pthreads program that dumps core.  Figure out why and\mbox{}\\
$\ast$   then fix it.\mbox{}\\
$\ast$\mbox{}\\
$\ast$ SOURCE: 9/98 Blaise Barney\mbox{}\\
$\ast$ LAST REVISED: 10/8/99 Blaise Barney\mbox{}\\
$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast$$\ast/$}\mbox{}\\
\mbox{}\\
{\tt \#include} $<${\tt{}pthread.h}$>$\mbox{}\\
{\tt \#include} $<${\tt{}stdio.h}$>$\mbox{}\\
{\tt \#define} NTHREADS	8\mbox{}\\
{\tt \#define} ARRAY\_SIZE      16000\mbox{}\\
\mbox{}\\
{\bf void} $\ast$Hello({\bf void} $\ast$threadid)\mbox{}\\
\{\mbox{}\\
\hspace*{3\indentation}{\bf double} A[ARRAY\_SIZE];\mbox{}\\
\hspace*{3\indentation}{\bf int} i;\mbox{}\\
\hspace*{3\indentation}sleep(3);\mbox{}\\
\hspace*{3\indentation}{\bf for} (i=0; i$<$ARRAY\_SIZE; i++)\mbox{}\\
\hspace*{3\indentation}\{\mbox{}\\
\hspace*{6\indentation}A[i] = i $\ast$ 1.0;\mbox{}\\
\hspace*{3\indentation}\}\mbox{}\\
\hspace*{3\indentation}printf({\tt"\%d: Hello World!   \%f$\backslash$n"}, threadid, A[ARRAY\_SIZE$-$1]);\mbox{}\\
\hspace*{3\indentation}pthread\_exit(NULL);\mbox{}\\
\}\mbox{}\\
\mbox{}\\
{\bf int} main({\bf int} argc, {\bf char} $\ast$argv[])\mbox{}\\
\{\mbox{}\\
\hspace*{3\indentation}pthread\_t threads[NTHREADS];\mbox{}\\
\hspace*{3\indentation}size\_t stacksize;\mbox{}\\
\hspace*{3\indentation}pthread\_attr\_t attr;\mbox{}\\
\hspace*{3\indentation}{\bf int} rc, t;\mbox{}\\
\hspace*{3\indentation}pthread\_attr\_init(\&attr);\mbox{}\\
\hspace*{3\indentation}pthread\_attr\_getstacksize (\&attr, \&stacksize);\mbox{}\\
\hspace*{3\indentation}printf({\tt"Thread stack size $=$ \%d bytes (hint, hint)$\backslash$n"},stacksize);\mbox{}\\
\hspace*{3\indentation}{\bf for}(t=0;t$<$NTHREADS;t++)\{\mbox{}\\
\hspace*{6\indentation}rc = pthread\_create(\&threads[t], NULL, Hello, ({\bf void} $\ast$)t);\mbox{}\\
\hspace*{6\indentation}{\bf if} (rc)\{\mbox{}\\
\hspace*{9\indentation}printf({\tt"ERROR; return code from pthread\_create() is \%d$\backslash$n"}, rc);\mbox{}\\
\hspace*{9\indentation}exit($-$1);\mbox{}\\
\hspace*{6\indentation}\}\mbox{}\\
\hspace*{3\indentation}\}\mbox{}\\
\hspace*{3\indentation}printf({\tt"Created \%d threads.$\backslash$n"}, t);\mbox{}\\
\hspace*{3\indentation}pthread\_exit(NULL);\mbox{}\\
\}\mbox{}\\
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