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.

"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

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.

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.

If you're small and can speak clearly and you're a cute kid, that's the craft, really. The whole child actor thing can be dangerous sometimes. Other kids were taking piano lessons; I did ballet and acting.

To me I've just really, really found a relaxed, peaceful side of my life and I'm enjoying it.

I am no technophobe. I like being able to calibrate communication, depending on the situation - texting for the simple and immediate; email for business or when I want to put some lag time into the exchange; Twitter to promote something; Facebook to draw a crowd.

It is the job of our military to protect America and to hunt down and kill those who would threaten to murder Americans.

In the Middle Ages, cathedrals and convents burned like tinder; imagining a medieval story without a fire is like imagining a World War II movie in the Pacific without a fighter plane shot down in flames.

I always say beauty is only sin deep.

When you make the finding yourself - even if you're the last person on Earth to see the light - you'll never forget it.

Failure’s not an option. It’s a step.

We get picked up in these Rolls Royces and get three miles down the highway and five cop cars pull us over.

I mean, I don't really go out at night in terms of noisy, busy places; I prefer more of a quiet corner somewhere.

Writing is hard, hard work; that's just the way it is.

Permanence, perseverance and persistence in spite of all obstacles, discouragements, and impossibilities: It is this, that in all things distinguishes the strong soul from the weak.

Hedge funds, private equity and venture capital funds have played an important role in providing liquidity to our financial system and improving the efficiency of capital markets. But as their role has grown, so have the risks they pose.

At the moment I really love listening to the Dave Matthews Band.

Relatives cannot help you in the studios. You stand or fall by your own efforts.

Some of them, in accepting the proposed plan of government, coupled their acceptance with a recommendation of various additions to the Constitution, which they deemed essential to the preservation of the rights of the States, or of the People.

If the American people don't love me, their descendants will.

People think top singers are overpaid, but opera houses have a top fee, which is a good thing. Of course concerts are different- everyone wants to make as much money as possible.

All wages are based primarily on productive power. Anything else would be charity.

I've always had to have some kind of failure before I was successful.

Respect commands itself and it can neither be given nor withheld when it is due.

Discontent, blaming, complaining, self-pity cannot serve as a foundation for a good future, no matter how much effort you make.

My position does not give me the liberty to exclude anything, but my mood tells me there will not be violence.

Never comment on a woman's rear end. Never use the words "large" or "size" with "rear end." Never. Avoid the area altogether. Trust me.