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.

"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.

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.

A lot of joblessness in the black community doesn't seem to be reachable through fiscal and monetary policies. People have not been drawn into the labor market even during periods of economic recovery.

In my case, things have pretty much been handed to me.

When I finally put my guitar in the case the last time, I want to be remembered just as a singer, not as a country singer or pops singer - just a singer.

In order to be a top-tier candidate, I need 7.5 million dollars, and I currently have 0.0 million dollars.

When Im with you even my past seems like a bad dream he says. Ive sat on this hill a hundred times and all I used to see were lights that represented places where I wasnt wanted where I never belonged. Now when you arent with me I look east and know one of those lights represents you and I dont feel alone anymore.

War is just a racket. A racket is best described, I believe, as something that is not what it seems to the majority of people. Only a small inside group knows what it is about. It is conducted for the benefit of the very few at the expense of the masses.

When I was a young student, I only listened to foreign music, mainly rock music and hard rock. Then I surprised myself by discovering ethnic music. Now I like to listen to music from different places, and in many situations. Even when you work, some ethnic music calms the nerves.

I have absolutely no difficulty myself with the playing of God Save the Queen in the presence of Her Majesty.

Good books enlighten the mind bad books corrupt the soul.

Oh, God, food is a constant struggle for me. With exercise, I get my workout done, and I'm done until tomorrow. With food, I eat, and then an hour later I'm hungry again!

At some point, I realized that you don't get a full human life if you try to cut off one end of it; that you need to agree to the entire experience, to the full spectrum of what happens.

Social Security's future has gotten worse, and each year we delay reform adds to the cost we are pushing off onto our children.

My mother was married to one of the greatest newsmen of all times. CNN was built out of his idealism and his recognition that, in a global age, we needed greater understanding of the world around us.

My career was always about working with people, and understanding issues and problems and helping them to solve those issues and problems. How you deal with people - that's what diplomacy is all about. So while I'm not a career diplomat, many of the skills I had seemed to directly translate into the diplomatic arena.

Our actions are express image of our thoughts.

It's been our goal as a program to always give our players the best opportunity to be successful, whether it's personally, academically, or athletically.

When you're reading, like, a character's thoughts, or when it's in first person, you're reading kind of their own story, so you have the opportunity to see what makes that character complex or complicated. And to me, that's what the whole point of fiction is.

Every woman I have known has actually deepened my spiritual awareness. Even if I have been a selfish man and treated them badly... There were two women, I won't name them, who had a powerful religious effect on me. The ancient idea of a muse is there.

So many of the bands that influenced me growing up were English, even if I didn't realise it. English pop ruled the world in the '80s!

I like to eat cheese out of a bowl everyday.

I gave up on music. I still love to play, but it's too hard to make a living. And I think that was a mature decision to make.

Any girl who likes watching movies would like to work in them and would want to do all of that. I'm also one of them. But people know me for badminton and love me for it. So I'd stick to it right now. But maybe after badminton, I'll think about it.

Never forget posterity when devising a policy. Never think of posterity when making a speech.

When they wrote the Constitution, only white male landowners had the right to vote.