From aa56f874b49f2f64a959699702526c3c38f50b42 Mon Sep 17 00:00:00 2001
From: Matthew Strapp <strap012@umn.edu>
Date: Mon, 26 Oct 2020 08:48:02 -0500
Subject: Add functions made before

---
 P2/lib/utils.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 52 insertions(+), 1 deletion(-)

(limited to 'P2')

diff --git a/P2/lib/utils.c b/P2/lib/utils.c
index 17b3104..4d815a0 100644
--- a/P2/lib/utils.c
+++ b/P2/lib/utils.c
@@ -1,10 +1,61 @@
 #include "utils.h"
 
 char *getChunkData(int mapperID) {
+	//Message
+	struct msgBuffer message;
+	//Queue ID, not sure what it actually does
+	int mid;
+	//Queue Key
+	key_t key = 10;
+	mid = msgget(key, 0666 | IPC_CREAT);
+	if (mid < 0) {
+		perror("Cannot open queue.\n");
+		return NULL;
+	}
+	msgrcv(mid, &message, MSGSIZE, mapperID, 0);
+	if (strcmp("END", message.msgText)) {
+		struct msgBuffer ACK = {mapperID, "ACK"};
+		msgsnd(mid, &ACK, MSGSIZE, 0);
+	}
+	// msgctl(mid, IPC_RMID, 0);
+	return message.msgText;
 }
 
 // sends chunks of size 1024 to the mappers in RR fashion
 void sendChunkData(char *inputFile, int nMappers) {
+	struct msgBuffer message;
+	key_t key = 10;
+	int msgid;
+
+	// open message queue
+	msgid = msgget(key, 0666 | IPC_CREAT);
+	if (msgid < 0) {
+		perror("Cannot open queue.\n");
+		exit(-1);
+	}
+	// message.msgText = 1;
+	FILE *fptr = fopen(inputFile, "r");
+
+	// construct chunks of 1024 bytes
+	while(fgets(&message, chunkSize, fptr) != EOF) {
+
+		/*  Go to the end of the chunk, check if final character 
+		    is a space if character is a space, do nothing
+		    else cut off before that word and put back file      */
+		// TODO! help 
+
+		msgsnd(msgid, &message, mapperID);
+	}
+
+	for (long i = 1; i < nMappers; i++) {
+		struct msgBuffer END = {i, "END"};
+		msgsnd(msgid, &END, MSGSIZE, 0);
+
+		// TODO! does this need to be in another loop or is blocking good enough?
+		msgrcv(msgid, &message, MSGSIZE, i, 0);
+	}
+
+	// msgctl(msgid, IPC_RMID, 0); // close that bih
 }
 
 // hash function to divide the list of word.txt files across reducers
@@ -89,4 +140,4 @@ void bookeepingCode(){
 	removeOutputDir();
 	sleep(1);
 	createOutputDir();
-}
\ No newline at end of file
+}
-- 
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