POSIX Dead lock

Hey guys, im just trying to create 10 threads which then i want to print out in backwards order... so
"from thread 10", "from thread 9" ---> "from thread 1"

But im getting deadlocked after i get "from thread 10" to print.... Any ideas?

#include <stdio.h>
#include <sys/types.h>
#include <pthread.h>

pthread_mutex_t mlock;
pthread_cond_t conditions[10];

int count = 10;


void * func(void * arg)
{
   int index = (int)arg - 1;

   pthread_mutex_lock(&mlock);

      while(count != (int)arg)
         pthread_cond_wait(&conditions[index], &mlock);

      printf("from thread %d\n", (int)arg);
      count--;
      index--;

      pthread_cond_signal(&conditions[index]);

    pthread_mutex_unlock(&mlock);

    return (NULL);
}


int main(int argc, char* argv[]) {
    int n,i;
    pthread_t threads[count];
    pthread_mutex_init(&mlock, NULL);

    for (i = 0; i < count; i++) {
      pthread_create(&threads[i], NULL, func, (void*)i+1);
      pthread_cond_init(&conditions[i], NULL);
    }

    for (i = 0; i < count; i++) {
      pthread_join(threads[i], NULL);
    }

    exit(1);
}
intazaarAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

efnCommented:
I don't know if this is the problem, but I can tell you one thing that looks fishy.

A thread might use a condition variable before it has been initialized.  Specifically, after a thread is started, it could easily get to the pthread_cond_wait call before the main thread has called pthread_cond_init.  This is not the order you want.

You could try moving the call to pthread_cond_init before the call to pthread_create and see if that helps.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
intazaarAuthor Commented:
Thx mate, that was exactly it. Runs like a dream!
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
C

From novice to tech pro — start learning today.