mutex lock destroy on APUE

[nanger]

struct foo*fp;

pthread_mutex_lock(&fp->lock);

if(--fp->count==0)
{
pthread_mutex_unlock(&fp->lock);
//if some other thread modified count, what will happen???
pthread_mutex_destroy(&fp->lock);
free(fp);
}

if some other thread modified count, what will happen???

[Athar]

You mean after the unlock? Nothing. What's supposed to happen?
Although if another thread messes with an object that is about to get deleted, you might have a problem anyway.