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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: minim2.c\mbox{}\\
$\ast$ DESCRIPTION:\mbox{}\\
$\ast$   This is a very minimal program using Pthreads. The main function \mbox{}\\
$\ast$   creates 4 threads. Each thread executes a function which prints out the \mbox{}\\
$\ast$   thread "number".  Creation of a joinable thread is demonstrated by using \mbox{}\\
$\ast$   the appropriate attributes when creating the thread.\mbox{}\\
$\ast$\mbox{}\\
$\ast$ SOURCE: Vijay Sonnad, IBM\mbox{}\\
$\ast$ LAST REVISED: 9/20/98 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$$\ast/$}\mbox{}\\
\mbox{}\\
{\tt \#include} $<${\tt{}pthread.h}$>$      \mbox{}\\
{\tt \#include} $<${\tt{}stdio.h}$>$ \mbox{}\\
\mbox{}\\
{\tt \#define} NUMTHDS 4\mbox{}\\
{\bf void} $\ast$thrdfun ({\bf void} $\ast$arg);\mbox{}\\
\mbox{}\\
{\bf int} main({\bf int} argc, {\bf char} $\ast$argv[])\mbox{}\\
\{ \mbox{}\\
\hspace*{3\indentation}{$/\ast$\it{}\mbox{}\\
\hspace*{3\indentation}We define an array of thread identifiers which are later used in the\mbox{}\\
\hspace*{3\indentation}call to create threads.\mbox{}\\
\hspace*{3\indentation}$\ast/$}\mbox{}\\
\hspace*{3\indentation}pthread\_t thrdid[NUMTHDS];\mbox{}\\
\hspace*{3\indentation}pthread\_attr\_t attr;\mbox{}\\
\hspace*{3\indentation}{\bf int} status,i;\mbox{}\\
\mbox{}\\
\hspace*{3\indentation}{$/\ast$\it{} Create attribute of JOINABLE for use in creating threads $\ast/$}\mbox{}\\
\hspace*{3\indentation}pthread\_attr\_init(\&attr);\mbox{}\\
\hspace*{3\indentation}pthread\_attr\_setdetachstate(\&attr, PTHREAD\_CREATE\_JOINABLE);\mbox{}\\
\mbox{}\\
\hspace*{3\indentation}{$/\ast$\it{} Create  threads using the attribute $\ast/$}\mbox{}\\
\hspace*{3\indentation}{\bf for} (i=0; i$<$NUMTHDS; i++)\mbox{}\\
\hspace*{8\indentation}\{\mbox{}\\
\hspace*{16\indentation}pthread\_create( \&thrdid[i], \&attr, thrdfun, ({\bf void} $\ast$)i);\mbox{}\\
\hspace*{8\indentation}\}\mbox{}\\
\mbox{}\\
\hspace*{3\indentation}pthread\_attr\_destroy(\&attr);\mbox{}\\
\mbox{}\\
\hspace*{2\indentation}\mbox{}\\
\hspace*{3\indentation}{$/\ast$\it{} Join with threads after creation  $\ast/$} \mbox{}\\
\hspace*{3\indentation}{\bf for}(i=0;i$<$NUMTHDS;i++)\mbox{}\\
\hspace*{7\indentation}\{\mbox{}\\
\hspace*{9\indentation}{\bf if} (pthread\_join( thrdid[i], ({\bf void} $\ast$$\ast$)\&status)$\neq$0) \mbox{}\\
\hspace*{12\indentation}printf ({\tt" Error in join $\backslash$n"});\mbox{}\\
\hspace*{7\indentation}\}\mbox{}\\
\mbox{}\\
\hspace*{3\indentation}pthread\_exit(NULL); \mbox{}\\
\}\mbox{}\\
\mbox{}\\
{$/\ast$\it{} This function is executed when the thread is created.  $\ast/$}\mbox{}\\
{\bf void} $\ast$thrdfun ({\bf void} $\ast$arg)\mbox{}\\
\{\mbox{}\\
\hspace*{3\indentation}printf ({\tt"My thread number $=$ \%d $\backslash$n"}, ({\bf int})arg);\mbox{}\\
\hspace*{3\indentation}pthread\_exit(({\bf void} $\ast$) 0);\mbox{}\\
\}\mbox{}\\
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