Subj : Re: Condition variables & mutexes
To   : comp.programming.threads
From : fabrizio
Date : Tue Jan 25 2005 05:29 pm

> static void *thread(void *arg)
> {
>     pthread_mutex_lock(&mutex);
>     pthread_cond_signal(&cond);
>     pthread_mutex_unlock(&mutex);
>     return NULL;
> }
> int main(void)
> {
>     pthread_t    tid;
> 
>     pthread_mutex_lock(&mutex);
>     pthread_create(&tid, NULL, thread, NULL);
>     pthread_cond_wait(&cond, &mutex);
>     pthread_join(tid, NULL);
>     return 0;
> }

I am not at all an expert but I think :
- you should create the thread before locking the mutex
- you should unlock the mutex after the cond_wait

int main(void) {
     pthread_t    tid;

     pthread_create(&tid, NULL, thread, NULL);

     pthread_mutex_lock(&mutex);
     pthread_cond_wait(&cond, &mutex);
     //some ops
     pthread_mutex_unlock(&mutex);

     pthread_join(tid, NULL);
     return 0;
}

but in this case I am not sure this is gooing to work.
you'll find a proper example here :
http://www.rt.com/man/pthread_cond_init.3.html

good luck

.