I'm trying to implement the Producer Consumer Algorithm in C so that producer.c takes in one character from a mydata.txt file and puts it into the shell variable DATA then consumer.c will read it from DATA and print it out. The output must be in the same format. All the while, producer.c and consumer.c gives the TURN to each other during the busy loop.
When I compile the program, I'm getting an error: error: too few arguments to function call, expected 1, have 0 because of both wait() functions. Please let me know if I did something wrong. I'm not sure if you'd need all the code but I hope this isn't too much!
main.c:
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "producer.c"
#include "consumer.c"
int main(){
char turn;
FILE *mydata = fopen("mydata.txt", "rt");
// Writing 0 into TURN.txt
FILE *TURN = fopen("TURN.txt", "wt");
if(TURN == NULL) exit(1);
putc('0', TURN);
fclose(TURN);
int pid = fork();
// Program done when turn == 'x'
while(turn - 'x' != 0){
TURN = fopen("TURN.txt", "rt");
turn = getc(TURN);
fclose(TURN);
// producer() uses pointer to mydata.txt, to avoid having to reopen in producer.c each time
if(pid == -1){ exit(1); }
if(pid == 0){ producer(mydata); wait(); }
if(pid != -1){ consumer(); wait(); }
}
fclose(mydata);
return 0;
}
Producer.c:
#include <stdio.h>
#include <stdlib.h>
void producer(FILE *mydata){
FILE *DATA;
// Writing 1 character from mydata.txt to DATA.txt
DATA = fopen("DATA.txt", "wt");
if(DATA == NULL) exit(1);
fprintf(DATA, "%c", getc(mydata));
fclose(DATA);
// Writing '1' into TURN.txt for consumer, or 'x' if done reading mydata.txt
FILE *TURN = fopen("TURN.txt", "wt");
if(TURN == NULL) exit(1);
if(!feof(mydata))
putc('1', TURN);
else
putc('x', TURN);
fclose(TURN);
}
consumer.c:
#include <stdio.h>
#include <stdlib.h>
void consumer(){
FILE *DATA;
DATA = fopen("DATA.txt", "r");
if(DATA == NULL) exit(1);
int c;
if(DATA == NULL) { exit(1); }
do {
c = fgetc(DATA);
if( feof(DATA) ) {
break ;
}
printf("%c", c);
} while(1);
fclose(DATA);
FILE *TURN = fopen("TURN.txt", "wt");
if(TURN == NULL) exit(1);
if(!feof(DATA))
putc('0', TURN);
else
putc('x', TURN);
fclose(TURN);
}
