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.

In our view the Olympic idea involves a strong physical culture supplemented on the one hand by mobility, what is so aptly called 'fair play', and on the other hand by aesthetics, that is the cultivation of what is beautiful and graceful.

It's the youth movement we have. A lot of young guys with a lot of passion. It brings the fun back to the game.

Mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true.

As long as your ideology identifies the main source of the world's ills as a definable group, it opens the world up to genocide.

The future? Like unwritten books and unborn children, you don't talk about it.

Those who are silent, self-effacing and attentive become the recipients of confidences.

Part of my advantage is that my strength is economic forecasting, but that only works in free markets, when markets are smarter than people. That's how I started. I watched the stock market, how equities reacted to change in levels of economic activity, and I could understand how price signals worked and how to forecast them.

In madness, I thought I was the most important person in the world.

America has two national budgets, one official, one unofficial.

I love giving gifts. It's almost like I don't open my gifts until, like, three days after Christmas 'cause I want to give everyone else their presents.

Comics are such a powerful educational tool. Simply put, there are certain kinds of information that are best communicated through sequential visuals.

A creative person is someone who imagines what other people cannot. Their value to us lies in expanding our own possibilities. Walls fall. We break out.

To the ideal of high consumption and the downgrading of spiritual values corresponds a conception of injustice that centers exclusively on the problem of consumption and equality in consumption cannot be achieved except by violence.

I'm very lucky.

I guess what really forms you as a person is what you do within your family to receive love or attention. In my family, what you had to do to receive attention was to have good conversation at the dinner table or for me to do well at school, and those were really my focuses because that was what was valued the most.

I wanted to be a writer as a teen... so storytelling was my first love. In my late teens, design became an obsession as I realized that I could express myself through the medium. Much later, when I founded Fuseproject in 1999, our slogan became 'design brings stories to life.'

To aim and hit, you need one eye only, and one good finger.

I got my degree in rhetoric.

The prime goal of an author is the same as a musician, which is to emotionally connect with the reader in some way or another.

We are safer, the region is safer, the world is safer without Saddam.

Wait for the one you love not the one who found you first.

Break a vase, and the love that reassembles the fragments is stronger than that love which took its symmetry for granted when it was whole.

When you are a pit bull, and you love what you do and you are going to continue to grow, that talent will find its way out.

As his talent expands, some of his stories become pointed social commentary; some are surprisingly effective religious tracts, disguised as science fiction. Others still are nostalgic vignettes, but under it all is still Bradbury, the poet of 20th-century neurosis.