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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$$\ast$\mbox{}\\
$\ast$ FILE: hello\_arg3.c\mbox{}\\
$\ast$ DESCRIPTION:\mbox{}\\
$\ast$   This "hello world" Pthreads program demonstrates an unsafe (incorrect) \mbox{}\\
$\ast$   way to pass thread arguments at thread creation.  In this case, the \mbox{}\\
$\ast$   argument variable is changed by the main thread as it creates new threads.\mbox{}\\
$\ast$\mbox{}\\
$\ast$ LAST REVISED: 09/04/02 Blaise Barney\mbox{}\\
$\ast$$\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} NUM\_THREADS	8\mbox{}\\
\mbox{}\\
{\bf char} $\ast$messages[NUM\_THREADS];\mbox{}\\
\mbox{}\\
{\bf void} $\ast$PrintHello({\bf void} $\ast$threadid)\mbox{}\\
\{\mbox{}\\
\hspace*{3\indentation}{\bf int} $\ast$id\_ptr, taskid;\mbox{}\\
\mbox{}\\
\hspace*{3\indentation}sleep(3);\mbox{}\\
\hspace*{3\indentation}id\_ptr = ({\bf int} $\ast$) threadid;\mbox{}\\
\hspace*{3\indentation}taskid = $\ast$id\_ptr;\mbox{}\\
\hspace*{3\indentation}printf({\tt"Thread \%d: \%s $\backslash$n"}, taskid, messages[taskid]);\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[NUM\_THREADS];\mbox{}\\
\hspace*{3\indentation}{\bf int} rc, t;\mbox{}\\
\mbox{}\\
\hspace*{3\indentation}messages[0] = {\tt"English: Hello World!"};\mbox{}\\
\hspace*{3\indentation}messages[1] = {\tt"French: Bonjour, le monde!"};\mbox{}\\
\hspace*{3\indentation}messages[2] = {\tt"Spanish: Hola al mundo"};\mbox{}\\
\hspace*{3\indentation}messages[3] = {\tt"Klingon: Nuq neH!"};\mbox{}\\
\hspace*{3\indentation}messages[4] = {\tt"German: Guten Tag, Welt!"}; \mbox{}\\
\hspace*{3\indentation}messages[5] = {\tt"Russian: Zdravstvytye, mir!"};\mbox{}\\
\hspace*{3\indentation}messages[6] = {\tt"Japan: Sekai e konnichiwa!"};\mbox{}\\
\hspace*{3\indentation}messages[7] = {\tt"Latin: Orbis, te saluto!"};\mbox{}\\
\mbox{}\\
\hspace*{3\indentation}{\bf for}(t=0;t$<$NUM\_THREADS;t++)\mbox{}\\
\hspace*{3\indentation}\{\mbox{}\\
\hspace*{6\indentation}printf({\tt"Creating thread \%d$\backslash$n"}, t);\mbox{}\\
\hspace*{6\indentation}rc = pthread\_create(\&threads[t], NULL, PrintHello, ({\bf void} $\ast$) \&t);\mbox{}\\
\hspace*{6\indentation}{\bf if} (rc)\mbox{}\\
\hspace*{6\indentation}\{\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{}\\
\mbox{}\\
\hspace*{3\indentation}pthread\_exit(NULL);\mbox{}\\
\}\mbox{}\\
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