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.

"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_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.

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

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.

I've been in politics now for long enough to not worry about what others are saying, but instead to talk about what I believe.

It's big production. It's huge. It's using studio technology to your benefit. You don't go in and play live and then just take the tapes and get them mastered. You have to create.

At night, I try to sneak in some of the shows that I love. I can't live without '30 Rock' - I was a fan before I joined the show in 2007 - and 'The Office.' 'Revenge' is my drama. And I love Jimmy Kimmel if I can stay up late enough to watch him.

The motivation for making movies is that people actually see them.

The time is right for electric cars - in fact the time is critical.

When you argue with your inferiors, you convince them of only one thing: they are as clever as you.

Mankind must put an end to war, before war puts an end to mankind.

If what you are doing is not moving you towards your goals, then it's moving you away from your goals.

The hardest decisions in life are not between good and bad or right and wrong but between two goods or two rights.

I know actors who have had to turn down good roles because they just don't pay enough. It's hard.

Pop changes week to week month to month. But great music is like literature.

The biggest problem with working at a treadmill desk: the compulsion to announce constantly that you are working at a treadmill desk.

To the fans, it does not matter a damn how you are. You are seen as the footballer, the idol, so no one thinks to stop and ask you, 'Hey, how are you?'

I'm psyched-up when I do radio. I can reach hundreds of thousands of people in a market. And way psyched-up when I'm on television. For people not to take it seriously is foolish.

So ultimately, it's idealistic to think that artists are able to step away from the power of the media and the way it controls things, and go on doing their own things.

I'm an appointee of President Obama.

Summer's filled with breaking the rules, standing apart, ignoring your head, and following your heart.

I've travelled around the UK a lot recently and have discovered that I really like trains. If you're in the quiet carriage, nobody can get hold of you and you can relax.

I was a tomboy, not a girlie girl.

When is a revival needed? When carelessness and unconcern keep the people asleep.

If you live long enough youll make mistakes. But if you learn from them youll be a better person. Its how you handle adversity not how it affects you. The main thing is never quit never quit never quit.

Be there for others, but never leave yourself behind.

The only people I've ever met who are really successful in their fields, regardless of what field that is, are people who are deeply passionate about the work they do every day and are motivated by a sense of purpose.

The best design tool is a long eraser with a pencil at one end.