gistfile1.txt

#include <iostream>
#include <unistd.h>
#include <ctime>
#include <cstdlib>
#include <signal.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <sys/wait.h>
#include <semaphore.h>

using namespace std;

#define MAX_PROCESSES 7
#define MAX_SEMAPHORES 7

int Id;

struct sharedSpace
{
	sem_t* binarySemaphores[MAX_SEMAPHORES];
};

sharedSpace* segment;

void process(int processNr)
{
	srand(time(0));
	int duration = rand()%10;
	int currentNumberOfSeconds = 0;
	for (int i = 0; i < duration; i++)
	{
		sleep(1);
		currentNumberOfSeconds++;
		cout << "Izvodim proces " << processNr << ": "
		     << currentNumberOfSeconds << "/" <<  duration << endl;
	}
}

int main()
{
	// stvaranje procesa
	int processNr = 1;
	// zajednicki mem prostor
	Id = shmget(IPC_PRIVATE,sizeof(sharedSpace)*100, 0600);
	if (Id == -1)
	{
		cout << "Shared memory allocation failed."
		     << endl;
		return -1;
	}
	segment = (sharedSpace*) shmat(Id, NULL, 0);
	for (int i = 0; i < MAX_SEMAPHORES; i++)
	{
		sem_init(*segment->binarySemaphores[i], 1, 0); // error: cannot convert 'sem_t' to 'sem_t*' for argument '1' to 'int sem_init(sem_t*, int, unsigned int)'
	}
	for (int i = 0; i < MAX_PROCESSES; i++)
	{
		if (fork() == 0)
		{
			process(processNr);
			exit(0);
		}
		processNr++;
	}
	for (int i = 0; i < MAX_PROCESSES; i++)
	{
		wait(NULL);
	}
	return 0;
}