watek

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/ipc.h>
#include <sys/types.h>
#include <sys/shm.h>
#include <pthread.h>

struct data{
    int label;
    int flag;
    char napis[20];
};

void* wp1(void* arg){
struct data *bufor;
int* mem = (int*) arg;
bufor = shmat((*mem),NULL,0);
int i;
for(i=1;i<=10;i++){
    (*bufor).label=1;
    (*bufor).flag = 1;
    strcpy((*bufor).napis, "watek 1");
    sleep(1);
    }
}

void* wp2(void* arg){
struct data *bufor;
int* mem = (int*) arg;
bufor = shmat((*mem),NULL,0);
int i;
for(i=1;i<=10;i++){
    (*bufor).label=2;
    (*bufor).flag = 1;
        strcpy((*bufor).napis, "watek 2");
    sleep(1);
    }
}

void* w1(void* arg){
struct data *bufor;
int* mem = (int*) arg;
bufor = shmat((*mem),NULL,0);
int i;
for(i=1;i<=10;i++){
    while((*bufor).flag == 0);
    printf("Odbiera watek 1: %s\n",(*bufor).napis);
    (*bufor).flag = 0;
    strcpy((*bufor).napis, "");
    }
}

void* w2(void* arg){
struct data *bufor;
int* mem = (int*) arg;
bufor = shmat((*mem),NULL,0);
int i;
for(i=1;i<=10;i++){
    while((*bufor).flag == 0);
    printf("Odbiera watek 2: %s\n",(*bufor).napis);
    (*bufor).flag = 0;
    strcpy((*bufor).napis, "");
    }
}

main(){
int pamiec1 = shmget(IPC_PRIVATE,sizeof(struct data),IPC_CREAT | 0600);
int pamiec2 = shmget(IPC_PRIVATE,sizeof(struct data),IPC_CREAT | 0600);
int i;
pthread_t watek[4];

pthread_create(&watek[1],NULL,&wp1,&pamiec1);
pthread_create(&watek[2],NULL,&w1,&pamiec1);
pthread_create(&watek[3],NULL,&wp2,&pamiec2);
pthread_create(&watek[4],NULL,&w2,&pamiec2);

for(i=1;i<=4;i++){
    pthread_join(watek[i],0);
    }
while (wait() != -1);
shmctl(pamiec1,IPC_RMID,NULL);
shmctl(pamiec2,IPC_RMID,NULL);
return 0;
}