2 producer 2 consumer reading same values

2producer2consumer.cpp

#include <stdio.h>
#include <pthread.h>
#include <semaphore.h>
#include <math.h>
#include <ctype.h>

#define NUM   15
int number = NUM, buff = 0,buff2 = 0;
char queue[NUM][NUM],queue2[NUM][NUM];

sem_t full_sem, empty_sem;


void insert(char e[]) {
    if (buff + 1 < number) {
        buff++;
        printf(", inserted text: %s", e);
        int i = 0;
        for (i = 0; i < number; ++i) {
            queue[buff][i] = e[i];
        }
    } else {
        printf("\nfull");
    }
    if (buff2 + 1 < number) {
        buff2++;
        printf(", inserted text: %s", e);
        int i = 0;
        for (i = 0; i < number; ++i) {
            queue2[buff2][i] = e[i];
        }
    } else {
        printf("\nfull");
    }
}


void *produce2() {
    int i = 0;
    for (i = 0; i < number; ++i) {
        sem_wait(&full_sem);
        printf("\nP2::  insert random text #%d", i);
        char tmpChar[number];
        int j = 0;
        for (j = 0; j < number; ++j) {
            tmpChar[j] = (char) 'a' + (random() % 26);
        }
        insert(tmpChar);
        sem_post(&empty_sem);
    }


}

void *produce() {
    int i = 0;
    for (i = 0; i < number; ++i) {
        sem_wait(&full_sem);
        printf("\nP1:: insert random text #%d", i);
        char tmpChar[number];
        int j = 0;
        for (j = 0; j < number; ++j) {
            tmpChar[j] = (char) 'a' + (random() % 26);
        }
        insert(tmpChar);
        sem_post(&empty_sem);
    }


}

void *consume(void *a) {

    int i = 0;
    for (i = 0; i < number; ++i) {
        char v[number];
        sem_wait(&empty_sem);

        if (buff > 0) {
            int j = 0;
            for (j = 0; j < number; ++j) {
                v[j] = toupper(queue[buff][j]);
            }
            buff--;
        } else {
            printf("\nempty");
        }

        printf("\nc1:: uppercase char: %s", v);
        sem_post(&full_sem);
    }


}
void *consume2(void *a) {

    int i = 0;
    for (i = 0; i < number; ++i) {
        char v[number];
        sem_wait(&empty_sem);

        if (buff2 > 0) {
            int j = 0;
            for (j = 0; j < number; ++j) {
                v[j] = toupper(queue2[buff2][j]);
            }
            buff2--;
        } else {
            printf("\nempty");
        }

        printf("\nc2:: uppercase char: %s", v);
        sem_post(&full_sem);
    }


}

int main() {
    pthread_t t[4];
    sem_init(&full_sem, 0, number - 1);
    sem_init(&empty_sem, 0, 0);

    pthread_create(&t[0], NULL, &produce, NULL);
    pthread_create(&t[1], NULL, &produce2, NULL);

    pthread_create(&t[2], NULL, &consume, NULL);
    pthread_create(&t[3], NULL, &consume2, NULL);

    pthread_join(t[0], NULL);
    pthread_join(t[1], NULL);
    pthread_join(t[2], NULL);
    pthread_join(t[3], NULL);

    sem_destroy(&full_sem);
    sem_destroy(&empty_sem);
    return 0;
}

|SampleOutput

P2::  insert random text #0, inserted text: nwlrbbmqbhcdarz, inserted text: nwlrbbmqbhcdarz
P2::  insert random text #1, inserted text: owkkyhiddqscdxr, inserted text: owkkyhiddqscdxr
P2::  insert random text #2, inserted text: jmowfrxsjybldbe, inserted text: jmowfrxsjybldbe
P2::  insert random text #3, inserted text: fsarcbynecdyggx, inserted text: fsarcbynecdyggx
P2::  insert random text #4, inserted text: xpklorellnmpapq, inserted text: xpklorellnmpapq
P2::  insert random text #5, inserted text: fwkhopkmcoqhnwn, inserted text: fwkhopkmcoqhnwn
P2::  insert random text #6, inserted text: kuewhsqmgbbuqcl, inserted text: kuewhsqmgbbuqcl
P2::  insert random text #7, inserted text: jjivswmdkqtbxix, inserted text: jjivswmdkqtbxix
P2::  insert random text #8, inserted text: mvtrrbljptnsnfw, inserted text: mvtrrbljptnsnfw
P2::  insert random text #9, inserted text: zqfjmafadrrwsof, inserted text: zqfjmafadrrwsof
P2::  insert random text #10, inserted text: sbcnuvqhffbsaqx, inserted text: sbcnuvqhffbsaqx
P2::  insert random text #11, inserted text: wpqcacehchzvfrk, inserted text: wpqcacehchzvfrk
P2::  insert random text #12, inserted text: mlnozjkpqpxrjxk, inserted text: mlnozjkpqpxrjxk
P2::  insert random text #13, inserted text: itzyxacbhhkicqc, inserted text: itzyxacbhhkicqc
c2:: uppercase char: ITZYXACBHHKICQC
c2:: uppercase char: MLNOZJKPQPXRJXK
c2:: uppercase char: WPQCACEHCHZVFRK
c2:: uppercase char: SBCNUVQHFFBSAQX
c2:: uppercase char: ZQFJMAFADRRWSOF
c2:: uppercase char: MVTRRBLJPTNSNFW
c2:: uppercase char: JJIVSWMDKQTBXIX
c2:: uppercase char: KUEWHSQMGBBUQCL
c2:: uppercase char: FWKHOPKMCOQHNWN
c2:: uppercase char: XPKLORELLNMPAPQ
c2:: uppercase char: FSARCBYNECDYGGX
c2:: uppercase char: JMOWFRXSJYBLDBE
c2:: uppercase char: OWKKYHIDDQSCDXR
c2:: uppercase char: NWLRBBMQBHCDARZ
P2::  insert random text #14
full, inserted text: oendtomfgdwdwfc
c2:: uppercase char: OENDTOMFGDWDWFC
P1:: insert random text #0
full, inserted text: gpxiqvkuytdlcgd
P1:: insert random text #1
full, inserted text: ewhtaciohordtqk
P1:: insert random text #2
full, inserted text: vwcsgspqoqmsboa
P1:: insert random text #3
full, inserted text: guwnnyqxnzlgdgw
P1:: insert random text #4
full, inserted text: pbtrwblnsadeugu
P1:: insert random text #5
full, inserted text: umoqcdrubetokyx
P1:: insert random text #6
full, inserted text: hoachwdvmxxrdry
P1:: insert random text #7
full, inserted text: xlmndqtukwagmle
P1:: insert random text #8
full, inserted text: juukwcibxubumen
P1:: insert random text #9
full, inserted text: meyatdrmydiajxl
P1:: insert random text #10
full, inserted text: oghiqfmzhlvihjo
P1:: insert random text #11
full, inserted text: uvsuyoypayulyei
P1:: insert random text #12
full, inserted text: muotehzriicfskp
P1:: insert random text #13
full, inserted text: ggkbbipzzrzucxa
c1:: uppercase char: ITZYXACBHHKICQC
c1:: uppercase char: MLNOZJKPQPXRJXK
c1:: uppercase char: WPQCACEHCHZVFRK
c1:: uppercase char: SBCNUVQHFFBSAQX
c1:: uppercase char: ZQFJMAFADRRWSOF
c1:: uppercase char: MVTRRBLJPTNSNFW
c1:: uppercase char: JJIVSWMDKQTBXIX
c1:: uppercase char: KUEWHSQMGBBUQCL
c1:: uppercase char: FWKHOPKMCOQHNWN
c1:: uppercase char: XPKLORELLNMPAPQ
c1:: uppercase char: FSARCBYNECDYGGX
c1:: uppercase char: JMOWFRXSJYBLDBE
c1:: uppercase char: OWKKYHIDDQSCDXR
c1:: uppercase char: NWLRBBMQBHCDARZ
P1:: insert random text #14, inserted text: mludfykgruowzgi
full
c1:: uppercase char: MLUDFYKGRUOWZGI