Contents

  1. .
  2. ./forkpuzzle2.c
  3. ./forkpuzzle.c
  4. ./index.html
  5. ./sixforks.c

. 1/5

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./forkpuzzle2.c 2/5

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/*
 * Fork Puzzle2
 */
 
#include<stdio.h>

int main() {
    int pid= fork();
    int i;
    int status;

    if (pid != 0 ) {
        for(i=0; i<10; i++) {
            printf("Parent process %d running.\n", getpid());
            sleep(.5);
        }
        wait(&status);
        printf("Parent done %d\n", status);
    }
    else {
        for(i=0; i < 10; i++) {
            printf("Child process %d running.\n", getpid());
            sleep(.5);
        }
        printf("Child done\n");
    }

}





./forkpuzzle.c 3/5

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/*
 * Fork Puzzle.
 * Guarantees in the output: Parent's x after wait is last.
 * No other guarantees in output between Parent and Child
 */
 
#include<stdio.h>

int main() {
    int x = 27;
    int pid = fork();
    if (pid != 0) {
        printf("Parent's x before wait is %d\n",x);
        x = x + 5;
        wait(NULL); 
        printf("Parent's x after wait is %d\n",x);
    } else {
        printf("Child's x before sleep is %d\n",x);
        sleep(1);
        x = x + 10;
        printf("Child's x after sleep is %d\n",x);
    }
}






./index.html 4/5

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<html>
<head><title>Examples for /home/faculty/sprenkle/public_html/cs330/examples/11-processes</title>
<link rel="stylesheet" type="text/css" href="http://www.cs.wlu.edu/~sprenkle/cs330/assignments/assign.css" />
</head>
<body>
<h1>Examples for /home/faculty/sprenkle/public_html/cs330/examples/11-processes</h1>
<ul>
<li><a href=".//code.html">All IN ONE FILE (pretty syntax)</a>
<li><a href=".//forkpuzzle.c">forkpuzzle.c</a></li>
<li><a href=".//forkpuzzle2.c">forkpuzzle2.c</a></li>
<li><a href=".//sixforks.c">sixforks.c</a></li>
</ul>
</body>






./sixforks.c 5/5

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/*
 * Number of processes created: 2^{number of forks}
 */

#include<stdio.h>

int main(int argc, char* argv) {
  fork();
  fork();
  fork();
  fork();
  fork();
  fork();
  printf("Process %d exiting from %d.\n", getpid(), getppid());
}






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