Multithreaded C program using the Pthreads API $($Use Ubuntu $($Linux$))$

Create, compile, and execute a C program to demonstrate the basic Pthreads API for constructing a multithreaded program that calculates the summation of a nonnegative integer in a separate thread. When this program begins, a single thread of control begins in main$().$ After some initialization, main$()$ creates a second thread that begins control in the runner$()$ function. Refer Fig $4\mathrm{.}11$ Multithreaded C program using the Pthreads API. You need to add #include to include the standard library to avoid implicit declaration of function $$atoi$$ warning.

Note: Verify if all underscores are present. All pthread functions begin with pthread

To compile a program called multithread.c:

gcc multithread.c $-$pthread $-$o multithread

The sample program calculates the summation of the integer parameter provided on the command line. To compute summation of numbers $1$ to $100,$ execute:

$./$multithread $100$

For full points, submit before due time $(2/21/245$:$30$ p$.$m$.$ PST$)$

Pthreads:

#include

#include

#include

int sum;

void $*$runner$($void $*$param$)\{$

int i$,$ upper $=$ atoi$(($char $*)$param$)$;

sum $=0$;

for $($i $=1$; i $<=$ upper; i$++)$

sum $+=$ i;

pthread$\_$exit$(0)$;

$\}$

int main$($int argc, char $*$argv$[])\{$

pthread$\_$t tid;

pthread$\_$attr$\_$t attr;

pthread$\_$attr$\_$init$($&attr$)$;

pthread$\_$create$($&tid, &attr, runner, argv$[1])$;

pthread$\_$join$($tid$,$ NULL$)$;

printf$("$sum $=\%$d

$",$ sum$)$;

return $0$;

$\}$