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.

"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.

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

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 are few things more pleasing than the contemplation of order and useful arrangement.

Disco satisfied social as well as musical needs. Disco people got to dress up all the time and go to places ... where everybody sort of looked good and later after an evening of chemical alteration everybody looked even better and the next thing they knew they were getting The Blox Job.

Life is fragile handle with prayer.

Television used to be made much more in a vacuum; the only feedback the audience had for a long time was in a Nielsen number that would arrive sometime after the show had been broadcast. And now, people are just completely engaged on so many levels, and I think that you have to find a way as a show creator to follow your own compass.

When will I meet him? We meet our soulmates when we're on our soul path.

Shooting is very challenging because 10 metre air rifle you have different rules, short gun you have different rules.

In remembering those who lost their lives in the London attacks and the September 11th attacks we continue our commitment to fighting for freedom, democracy and justice.

The Cube can seem alive as it heats up in your hand. The fact that each face of the Cube is made of three layers of three blocks has an important meaning.

Asset managers have different approaches, and I don't wish to suggest there is only one way to run money. There are many ways one can attempt to reduce risk, improve performance, lower drawdowns and reduce volatility.

The world needs new leadership, but the new leadership is about working together.

I've directed things that other people have written before, and I've written things and given them to other directors. So I'm very versatile in terms of that, and I enjoy all of it.

They still had the Lord Chamberlain, so we had this idiotic censorship. We were allowed three Jesus Christs instead of 10. Why three were OK, I don't know.

It's not anti-Catholic to question, nor is it anti-Catholic to be honest about the previous shortcomings of the church, because that is the only way we can ensure its strength and dignity moving forward. It is, however, very Catholic to forgive each other and to never stop loving each other.

You can have the greatest player in terms of mastering an instrument and you could be yawning your head off when you hear them. So, it's not what you do, but the way you're doing it and in the end that's all that we have.

The worst memories stick with us, while the nice ones always seem to slip through our fingers.

I went to almost all of the agencies in New York when I first visited. A lot of them wanted to sign me but also kind of indirectly were telling me that I needed to change in some way. Some directly told me that I wouldn't be a model unless I changed the way that my body looked.

For example, when my mother died, the people who showed up just to put an apron on to cook, people who really do the right thing, so to speak, as my momma would always say to show that they care, a sense of community that we've lost so much in our country.

The news did not trouble her particularly; all news was bad, like wage demands, strikes, or war, and the wise person paid no attention to it.

The Anthropologie brand continues to succeed in emotionally engaging its customers while delivering strong financial results.

As a whole, the managers today are different in temperament. Most have very good communication skills and are more understanding of the umpire's job. That doesn't mean they are better managers. It just means that I perceive today's managers a bit differently.

New York's a big playground. I have a bike, and I'm really into just being outside. Especially in the summertime.

The processes of teaching the child that everything cannot be as he wills it are apt to be painful both to him and to his teacher.

It's such a great feeling to make people laugh. I know I've made people cry or want to slit their wrists, but to make people laugh is a very intoxicating, wonderful thing.

A lack of realism in the vision today costs credibility tomorrow.