pthread_mutex_destroy() does not free the memory used to store the pthread_mutex_t. It's up to you to free() your own memory. Also remember that both pthread_mutex_init() and pthread_mutex_destroy() return zero on success.

"dead list" that contains all stopped threads and then have a special cleanup thread that simply waits for an item to be added to the list. The cleanup thread calls pthread_join() to merge it with itself. Now your entire cleanup will be handled neatly and efficiently in a single thread.

mutexes are used to serialize access to *shared data*. Don't use them for non-shared data, and don't use them if your program's logic ensures that only one thread is accessing a particular data structure at a single time.

if you are using shared data, use mutexes for both reading and writing. Surround your read and write sections with pthread_mutex_lock() and pthread_mutex_unlock(), or use them any time a program's invariant is temporarily broken.

pthread_mutex_lock() accepts a single pointer to a mutex to lock. If the mutex already happens to be locked, the caller will go to sleep. When the function returns, the caller will be woken up (obviously), and the caller will also now hold the lock. This call either returns zero on success.

You should always unlock a mutex that you've locked as soon as safely possible (to increase performance). And you should never unlock a mutex that you don't hold a lock for

When you call pthread_mutex_trylock() you'll attempt to lock the mutex. If the mutex is currently unlocked you'll get the lock, and this function will return zero. However, if the mutex is locked this call won't block. Rather, it will return a non-zero EBUSY error value.

pthread_cond_wait() simultaneously unlock the mutex (so that other threads can modify the linked list) and wait on the condition (so that pthread_cond_wait() will wake up when it is "signalled" by another thread). Now that the mutex is unlocked, other threads can access and modify the linked list, possibly adding items

pthread_cond_wait() call has not yet returned. Unlocking the mutex happens immediately, but waiting on the condition mycond is normally a blocking operation, meaning that our thread will go to sleep, consuming no CPU cycles until it is woken up.

This is exactly what we want to happen. Our thread is sleeping, waiting for a particular condition to become true, without performing any kind of busy polling that would waste CPU time. From our thread's perspective, it's simply waiting for the pthread_cond_wait() call to return.

Immediately after unlocking the mutex, thread 2 calls the function pthread_cond_broadcast(&mycond). By doing so, thread 2 will cause all threads waiting on the mycond condition variable to immediately wake up. This means that our first thread (which is in the middle of a pthread_cond_wait() call) will now wake up.

After thread 2 called pthread_cond_broadcast(&mymutex) you might think that thread 1's pthread_cond_wait() will immediately return. Not so! Instead, pthread_cond_wait() will perform one last operation: relock mymutex. Once pthread_cond_wait() has the lock, it will then return and allow thread 1 to continue execution.

There was a time when cowboys respected their horses instead of riding them to death just to show off for a crowd.

My sister was an actress before I ever got into it, and I kinda wanted to do what she was doing. That was a really young age. Four years old? I just followed her everywhere and just wanted to do what she wanted to do. I didn't even know what I was getting myself into. I just wanted to be where she was and do what she was doing.

I don't have actor training myself.

I have these ideas that people go 'Oh, that's cool. I'd pay to see it, but I'm not gonna give you $25 million.'

You make your own luck by working hard, you know?

I get inspired by my friends, and if a friend is a writer, that is even deeper.

I was lucky enough to have the talent to play baseball. That's how I treated my career. I didn't think I was anybody special, anybody different.

Nobody can make me cry in public. I'll punch them first before they make my mascara smear.

If one undertakes retrospection of the day's events, one must do it regularly at the appointed hour, not fitfully, not doing it today, neglecting to do it tomorrow and the day after and then taking it up again on the fourth day. Such irregular practice is not conducive to the confirmation of the habit of retrospection.

A golden rule: to leave an incomplete image of oneself.

Life has changed enormously, and I hope - I hope more people read good things.

Have you ever noticed that when you must struggle to hear something, you close your eyes?

Insecurity and resignation mingle with the hope for a better order.

There's no one in the world close to Arnold Schwarzenegger. He is a phenomenon. He's brilliant.

You are not controlling the storm, and you are not lost in it. You are the storm.

Our problem with President Obama isn't that he's a bad person. By all accounts, he too is a good husband, and a good father - and thanks to lots of practice, a pretty good golfer.

If a show is good, it helps people learn about themselves in some way and in some function. Whatever the genre is, if it's executed well, audiences grow and learn from it, and that's where their passion and enthusiasm comes from.

I've been to the Titanic in a yellow submarine and the North Pole in a Russian nuclear ice breaker.

Charlatanism of some degree is indispensable to effective leadership.

I love prayer candles, and I use them often.

I really love the independent movies and I just think that sometimes when they throw a lot of money into it and a lot of special effects and a lot of stunts that you lose the connection, the human connection and I personally love movies that are about the human connection.

There are two kinds of pedestrians... the quick and the dead.

But first, the news: The House of Commons was sealed off today after police chased an escaped lunatic through the front door during Prime Minister's question time. A spokesman at Scotland Yard said it was like looking for a needle in a haystack.

Whatever else may divide us, Europe is our common home; a common fate has linked us through the centuries, and it continues to link us today.