Problemas con GetLIne y Threads en c

#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)
{
//fprintf(&lines[i], "%s\n", &line);
pthread_create(thread+i, NULL, pthread_function, (void *)line);
++i;
}

for ( i = 0; i < NUM_THREADS; ++i)
{
pthread_join(thread[i], NULL);
}
return 0;
}

He mirado el código y he hecho unos retoques.

Código

#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;
}

contenido de commands.txt:

Código:

Modo de compilación y ejecución del programa:

Código:

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

saludos.