pthreads: different behaviour on different thread count

So, I have a code (thread pool like) that creates few pthreads.

They are blocked on mutex first (while all threads not created) then wait on conditional variable until main thread broadcasts them a notification.

I test this code on two PC: 1st - gentoo x64 with 2 core AMD, 2nd - mandriva x32 with p4 (HT on). And I got different results.

It works well on 1st PC with 2 threads in pool, and on 2nd with 3 threads in pool.

But!

1st PC with thread count more then 2: throws error EPERM from main thread while unlocking mutex (locked before). 2nd PC with thread count more then 3: throws error EINVAL from main thread while unlocking mutex (locked before) and from all sequential calls to mutex and cond from created threads.

Any Idea? :)

p.s. threads mutex and cond created with NULL attrs

main():

...
pthread_mutex_init(&mutex, NULL);
pthread_cond_init(&queue_condition, NULL);
running = true;

lock();
while(pool_size<limit) {
    pthread_create(&threads[pool_size++], NULL, &run, this)    
}
unlock();

sleep(2);
schedule(new SimpleJob(...));
sleep(2);
...

run():

while (running) {
    lock();
    Job* job = next();

    if (job == NULL) {
        wait();
        unlock();
        continue;
    }
    unlock();
    job->execute();
    delete job;
}

routine:

void lock() {
    pthread_mutex_lock(&mutex);
}
void unlock() {
    pthread_mutex_unlock(&mutex);
}
void wait() {
    pthread_cond_wait(&queue_condition, &mutex);
}
void notifyAll() {
    pthread_cond_broadcast(&q开发者_如何学编程ueue_condition);
}
void schedule(Job* job) {
    lock();
    job_queue.push(job);
    notifyAll();
    unlock();
}
Job* next() {
    if (job_queue.empty()) {
        return NULL;
    }
    Job* job = job_queue.front();
    job_queue.pop();
    return job;
}

3076544208] hi! Im main thread!
3076544208] starting all threads
3076544208] locking...
3076544208] locked
3076544208] init:
3076544208] thread[1] = 3076541296 created
3076544208] thread[2] = 3068148592 created
3076544208] thread[3] = 3059755888 created
3076544208] thread[4] = 3051363184 created
3076544208] init done.
3076544208] unlocking...
3076544208] unlocked error=22
3051363184] run
3051363184] locking...
3051363184] locked error=22

I caught the bug! I forgot to initialize array threads that is a field of my class. ephemient was right it's memory corruption.