#include <pthread.h>
#include <stdio.h>
#include <err.h>
 
#define NUM_THREADS 10
 
pthread_mutex_t mutex;
pthread_cond_t tickets_ready;
 
int tickets = 2;
 
void* pthread_function(void *myline)
{
	char *theline;
	pthread_mutex_lock(&mutex);
	while(tickets==0)
	{
		pthread_cond_wait(&tickets_ready,&mutex);
	}
 
	-- tickets;
	pthread_mutex_unlock(&mutex);
 
	theline = (char *)myline;
	printf("Thread working: ¡this is my line! -> %s\n", theline);
	sleep(1);
 
 
	pthread_mutex_lock(&mutex);
	++tickets;
	if (tickets>=1)
	{
		pthread_cond_broadcast(&tickets_ready);
		/* code */
	}
 
	pthread_mutex_unlock(&mutex);
	pthread_exit(NULL);
}
 
int main(int argc, char** argv)
{
	pthread_t thread[NUM_THREADS];
 
	long int i=0;
	char *line;
	//char *lines[NUM_THREADS];
 
	FILE *file = fopen("commands.txt", "r");
	char *data;	 
	size_t len;
 
 
	if(file == NULL)
	{
		err(1, "commands.txt");
	}
 
 
	while( i < NUM_THREADS &&  getline(&line,&len,file) != -1)
	{
		//printf("%s\n", line);
		pthread_create(thread+i, NULL, pthread_function, (void *)line);
                pthread_join(thread[i], NULL);
		++i;
	}
 
	/*for ( i = 0; i < NUM_THREADS; ++i)
	{
		pthread_join(thread[i], NULL);
	}*/
	return 0;
}

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x@x:~/Escritorio$ gcc main.c -o main -lpthread
x@x:~/Escritorio$ ./main
Thread working: ¡this is my line! -> 1

Thread working: ¡this is my line! -> 2

Thread working: ¡this is my line! -> 3

Thread working: ¡this is my line! -> 4

Thread working: ¡this is my line! -> 5

Thread working: ¡this is my line! -> 6

Thread working: ¡this is my line! -> 7

Thread working: ¡this is my line! -> 8

Thread working: ¡this is my line! -> 9

Thread working: ¡this is my line! -> 0