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.

"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.

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.

Kids deserve the right to think that they can change the world.

First of all, I think the situation today is different. We're in a different place than we were in '93, '94.

When I became the chair of the British Film Institute, I didn't understand how much of my time would be taken up with trying to make a case for the British Film Institute: what it's for, why it exists, why it needs its money.

We were ensnared by the wisdom of the serpent; we are set free by the foolishness of God.

I would sing the blues if I had the blues.

Your services might be as useful as a barbershop on the steps of a guillotine.

I was always doodling house sketches.

Hearts of oak are our ships, Gallant tars are our men.

In Scotland, when people congregate, they tend to argue and discuss and reason; in Orkney, they tell stories.

I'm also interested in creating a lasting legacy for collectors because bronze will last for thousands of years so I'm not really selling the art to this particular collector but it is being passed on.

California has something which not every place in the world has: It has what I would call a sunny side, and I don't mean just physically, but the sunny side is a future. California's worth saving, to put it bluntly.

Odd, the years it took to learn one simple fact: that the prize just ahead, the next job, publication, love affair, marriage always seemed to hold the key to satisfaction but never, in the longer run, sufficed.

Arizona is the worst place to spend the summer - it's like 125 degrees - so my mom, my brother and I would go to the beach for two months to escape the heat.

When someone has a weight problem when they're pregnant, they will struggle before, during and after to lose weight.

I used drugs as a social activity; a way to have fun with friends.

My favorite books are actually very complicated - 'One Hundred Years of Solitude', 'Ulysses'.

I could never wear another uniform. I will forever be a Yankee.

In high school, I was doing my magazine 'Rookie' and a lot of writing, and I became a little less interested in the fashion world. I was approached by an agent for writing, and I said I wanted to act as well. They sent me scripts, and then I got my first Broadway play, 'This Is Our Youth'.

If you use weapons of war to bring about peace, you're going to have more war and destruction.

Other female rappers are overly sexual, have no wit, and their lyrics are so generic. I want to change the game to make rap that shows I'm not a normal female rapper - it's not about how rich I am, how much sex I have, or how many boyfriends I have. That's just not me.

With three younger brothers, we were always very competitive and combative. But my mother always says I get the drive from her.

We can't get to the $4 trillion in savings that we need by just cutting the 12 percent of the budget that pays for things like medical research and education funding and food inspectors and the weather service. And we can't just do it by making seniors pay more for Medicare.

David Bowie, for me, was the butchest guy in town. Jagger was like a truck driver.

I could not have done anymore, I had pushed myself to a limit that I had never touched before and that's definitely going to change you - than going out and doing what you do in practice every day.