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.

"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

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.

The labour Party has lost the last four elections. If they lose another, they get to keep the liberal party.

It's that I'm 39. I feel hot and sexy, actually... I feel it inside myself. I don't feel dried up and tired and no longer interested in sex is what I'm trying to say.

If youre not in New York youre camping out.

When you look at the actual numbers, the number of people who died after 9/11 was greater than the number of people who died in 9/11, even if you are talking Americans. But you know, I don't like to talk Americans. I want to talk everybody. More innocent people died after 9/11 because of 9/11 than died in 9/11.

I think the Clintons are brilliant. I've never met a person as intelligent as Bill, and I think Hillary is right up there with him. They're too smart for Washington.

It is a big adjustment but I've always loved that old saying of Jack Nicklaus: 'I retired from golf to go to work.' That sums it up for me.

People look at me as spiritual... but I am also very logical, very business-minded. The two come together.

I deliberately went to boarding school. It was my choice. My mum was abroad and I wanted to wean myself off being dependent. It was a very important time for me to be able to create my own individual, independent life; just as a way of growing up.

I would find myself backing away from all of the 'isms', all of the communities. I have always been able to be misused by every community But that is OK. I would rather be misused than neglected.

Derivatives are a huge, complex issue.

All publicity is good publicity

I wasn't allowed to throw big hooks and overhand rights until I'd been striking for three years. It's so you don't rely on those things from the very beginning. If your footwork sucks, and you can only stand in one place and throw your hands all crazy while the other person is running around, you're never going to be able to hit them.

In a capitalist society, persons who create capital, like Michael Eisner, are given the staggering rewards.

For no continuity of social act is possible without a corresponding social status and the many different kinds of act required in an industrial state, with its high degree of specialization, make for corresponding classification of status.

Originally, back in 1992, DKNY started because I couldn't find a pair of jeans. I also wanted to dress my teenage daughter Gabby. So it was the perfect street wardrobe: jeans, anoraks, jumpsuits, boyfriend jackets, sweaters, skirts and dresses. Then DKNY grew into an entire lifestyle concept, including tailored clothes you wear to work.

I've dated girls and I always wait for that one right time to kiss. I don't kiss on the first date, so I'll take a girl out to dinners, and we'll go bowling, and I make sure to charm them before I do it.

Mentorship is really important. I really like to talk to people who have been in the music industry much longer than me about artists' block, things I'm struggling with, or the music business. It's really important for artists to have a community. Sometimes you can feel quite isolated.

I'm a huge fan of mine. I go to just about every show I do.

There are so many people in film and television that get between a performer and the audience, and that's frustrating.

If I had to play only for people who liked the music because they heard it on the radio, it wouldn't make me happy. That's why I'm working so hard to have, yes, a profile as an artist, but also a profile as a DJ.

Courage - a perfect sensibility of the measure of danger, and a mental willingness to endure it.

I'm a terrible vacillator; I can be sure of something one day and change my mind the next.

Peace demands the most heroic labor and the most difficult sacrifice. It demands greater heroism than war. It demands greater fidelity to the truth and a much more perfect purity of conscience.

Every day I lugged my backpack through the halls, waiting for the final bell. Then I'd race home and hole up in my room, playing the drums and the piano, composing music.