diff options
Diffstat (limited to '')
| -rw-r--r-- | P2/lib/utils.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/P2/lib/utils.c b/P2/lib/utils.c index e0683ef..b33421a 100644 --- a/P2/lib/utils.c +++ b/P2/lib/utils.c @@ -1,5 +1,6 @@ #include "utils.h" +// Helper functions, open and close the queue int openQueue() { char cwd [50]; getcwd(cwd, 50); @@ -9,6 +10,7 @@ int closeQueue(int id) { return msgctl(id, IPC_RMID, NULL); } +// Creates a message struct msgBuffer makeMessage() { struct msgBuffer temp; memset(temp.msgText, '\0', MSGSIZE); @@ -16,6 +18,7 @@ struct msgBuffer makeMessage() { return temp; } +// Receives chunks from sendChunkData() char *getChunkData(int mapperID) { //Message struct msgBuffer message = makeMessage(); @@ -29,7 +32,7 @@ char *getChunkData(int mapperID) { return value; } -// sends chunks of size 1024 to the mappers in RR fashion +// Sends chunks of size 1024 to the mappers in RR fashion void sendChunkData(char *inputFile, int nMappers) { struct msgBuffer message = makeMessage(); // open message queue @@ -72,6 +75,7 @@ int hashFunction(char* Qkey, int reducers){ return (hash % reducers); } +// Retrieves file path for the words reducer must reduce and compute the total count for int getInterData(char *Qkey, int reducerID) { struct msgBuffer message= makeMessage(); //DEBUG! make sure it work. @@ -84,6 +88,8 @@ int getInterData(char *Qkey, int reducerID) { return (strncmp("END", message.msgText, 3) != 0); } +// Divides the word.txt files in output/MapOut/Map_mapperID folders across nReducers and send filepath +// across nReducers randomly from a hash function void shuffle(int nMappers, int nReducers) { struct msgBuffer message = makeMessage(); int id = openQueue(); @@ -91,7 +97,7 @@ void shuffle(int nMappers, int nReducers) { exit(-1); for (int i = 1; i <= nMappers; i++) { char newpath[100]; - sprintf(newpath, "output/MapOut/Map_%d", i); // Removed /, add to current dir + sprintf(newpath, "output/MapOut/Map_%d", i); DIR *dir = opendir(newpath); if (dir == NULL) break; @@ -113,19 +119,19 @@ void shuffle(int nMappers, int nReducers) { } } -// check if the character is valid for a word +// Check if the character is valid for a word int validChar(char c){ return (tolower(c) >= 'a' && tolower(c) <='z') || (c >= '0' && c <= '9'); } +// Gets words from the buffer char *getWord(char *chunk, int *i){ char *buffer = (char *)malloc(sizeof(char) * chunkSize); memset(buffer, '\0', chunkSize); int j = 0; while((*i) < strlen(chunk)) { // read a single word at a time from chunk - // printf("%d\n", i); if (chunk[(*i)] == '\n' || chunk[(*i)] == ' ' || !validChar(chunk[(*i)]) || chunk[(*i)] == 0x0) { buffer[j] = '\0'; if(strlen(buffer) > 0){ |