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.

Of all vices, drinking is the most incompatible with greatness.

We worked under a lot of pressure... three days to do an episode, sometimes two in a week, 39 episodes a year.

We Christians sometimes think we need a plan for evangelism. I dont think Jesus had an evangelism plan. I think He just interacted with the people He came into contact with.

In a childs eyes a mother is a goddess. She can be glorious or terrible benevolent or filled with wrath but she commands love either way. I am convinced that this is the greatest power in the universe.

And you can't complain about kissing Emma Watson. Isn't that what everyone in the world wants to do? I've known Emma for a few years. She's this amazing capacity of young and vibrant and brilliant, but also a bright, intelligent old soul.

Persia is 7,000 years old and will fight to survive.

Books and movies are different art forms with different rules. And because of that, they never translate exactly.

People with goals succeed because they know where they're going.

There is a moral dimension, for me, in anything that's any good.

Work is at the core of human dignity.

The years like great black oxen tread the world, and God, the herdsman goads them on behind, and I am broken by their passing feet.

To understand me, you have to meet me and be around me. And then only if I'm in a good mood - don't meet me in a bad mood.

There is so many things to do in life rather than playing tennis, so I'm sure I will find something. I just need a bit of time to kind of settle down.

Since I was a kid, music has been a huge part of my life. My parents had a pretty solid vinyl collection and exposed me to some amazing artists.

In the 1940s, I was doing something called the Equity Library Theater in New York, when a movie company came to see the play I was in and offered me a contract. But the deal was, my nose was too big and they wanted me to have surgery. My jaw was crooked, and I'd have to have that fixed, too. And they didn't like my name; it was too common.

I think there are more politicians in favor of electric cars than against. There are still some that are against, and I think the reasoning for that varies depending on the person, but in some cases, they just don't believe in climate change - they think oil will last forever.

Anyway, I went out and bought thousands of dollars worth of mature clothes so I'd look like a person to be taken seriously, instead of a pretty little twit.

Work can take on a new dimension if you know something about the artist.

There was all of about 30 kids where I went to school; we were all one clique.

If I'm going to be out there, I want to be in the top 10 and really have a chance of winning a Grand Slam.

I miss Lisa 'Left Eye' every day. Watched her VH1 special many times. A tragedy. But I didn't see the movie based on her.

The trouble with not having a goal is that you can spend your life running up and down the field and never score.

Utah may well be the most cosmopolitan state in America. Vast numbers of young Mormons - increasingly women as well as men - spend a couple of years abroad as missionaries and return jabbering in Thai or Portuguese and bearing a wealth of international experience.

We have to protect all journalists, and journalists have to be allowed to do their jobs.