Watki

#include <stdio.h>
#include <stdlib.h>
#include <sys/msg.h>
#include <pthread.h>

struct msgbuf{
    long type;
    int msg;
} buf,buf2,buf3;
void *wyslij(void* arg){
int i,x;
buf.type = 21;
for(i = 0; i<10;i++){
    int* qid = (int*) arg;
    x = (rand() % 10);
    buf.msg = x;
    msgsnd((*qid),&buf,sizeof(buf)-sizeof(long),0);
    }
}

void *odbierz(void* arg){
int i,s = 0;
int* qid = (int*) arg;
for(i = 0;i<10;i++){

    msgrcv((*qid),&buf2,sizeof(buf2)-sizeof(long),21,0);
    s += buf2.msg;
    }
buf2.type = 22;
buf2.msg = s;
msgsnd((*qid),&buf2,sizeof(buf2)-sizeof(long),0);
}

void *pokaz(void* arg){

    int* qid = (int*) arg;
    msgrcv((*qid),&buf3,sizeof(buf3)-sizeof(long),22,0);
printf("%d\n",buf3.msg);

}

int main(){
srand(4324);
int qid = msgget(IPC_PRIVATE,IPC_CREAT | 0666);
pthread_t w,o,p;
pthread_create(&w,NULL,wyslij,&qid);
pthread_create(&o,NULL,odbierz,&qid);
pthread_create(&p,NULL,pokaz,&qid);

pthread_join(w,NULL);
pthread_join(o,NULL);
pthread_join(p,NULL);
return 0;

}