rwtest.c

#include "types.h"
#include "user.h"

#define NCHILD 10

void testReadersWriters(int* pattern , int pattern_size);

int main ()
{
    char argv[100];

    printf(1,"Enter pattern for Readers/Writers test:\n");

    int read_size = read(0,argv,sizeof(argv));
    argv[read_size -1] = '\0';

    int pattern[100], i;

    for (i = 0; argv[i + 1] != '\0'; i++){
        if(argv[i + 1] == '0'){
            pattern[i] = 0;
        } 
        else if(argv[i + 1] == '1'){
            pattern[i] = 1;
        } 
        else{
            printf(1,"pattern is not correct");
            exit();
        }
    }

    testReadersWriters(pattern,i);
    exit();
    return 0;

}

void testReadersWriters(int* pattern , int pattern_size){

    int pid, i;
    rwinit();
    pid = fork();
    int parent = pid;

    for(i = 1; i < pattern_size; i++){
        if (pid < 0){
            printf(1,"fork failed\n");
            exit();
        } 
        else if (pid > 0){
            pid = fork();
        } 
        else {
            break;
        }
        
    }

    if (pid < 0){
        printf(1,"fork failed\n");
        exit();
    } 
    else if (pid == 0) {
   //     printf(1,"child adding to shared counter \n");
       // int res = rwtest (pattern[i-1]);
	rwtest (pattern[i-1]);
        if (pattern[i - 1] == 0) {
      //      printf(2,"reader read from shared counter: %d\n",res);
        } 
        else {
      //      printf(1,"writer added to shared counter\n");
        }
    } 
    else {
        if (pid == parent){
            sleep(1000);
        }

        for (i = 0; i < pattern_size; i++)
        {
            wait();
        }

        printf(1,"user program finished\n");
        int res = rwtest(0);
        printf(1,"last value of shared counter is: %d", res);
        
    }


}