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

"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.

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.

Web sites are designed to keep young people from using the keyboard, except to enter in their parents' credit card information.

The dreams which reveal the supernatural are promises and messages that God sends us directly: they are nothing but His angels, His ministering spirits, who usually appear to us when we are in a great predicament.

If we have a chance of succeeding and bringing stability and democracy to Iraq, it will mean learning from our mistakes, not denying them and not ignoring them.

My father's father came from Russia; my mother came from Romania.

Everything I discovered was new and most of it was really valuable.

Naturally I drew register a little exaggerated, in order to create something new in the sense of a sublime literature that sings of despair only in order to oppress the reader, and make him desire the good as the remedy.

When I was coming up as an entrepreneur, I had to fight for everything I got, and there was no clear roadmap of how to be successful.

You do not export democracy through the Defense Department or the Defense Secretary. You do it through trade agreements, through the Department of Commerce and favorable agreements with our friends and neighbors across the globe.

Scientific management promised to replace rules of thumb with accurate measurements.

I was a kid, 12 or something, when the Partridge Family was big on TV. I liked the curly cord running from the bass to the amps, which were real fancy. That cord looked so cool. I said, 'Wow! I gotta play something like that!'

I've been really lucky that I've been exposed to a lot of lovely, talented people who are not jerks, and I would like to continue that streak.

When a caterpillar looks in the mirror he sees a butterfly.

The Democrats have come right out and said it: the power of the central government shall have no limits at all.

I win by submissions, knockouts. There's guys ranked above me, but no one's interested in seeing them fight. They want to see me fight.

If at first you don't succeed, find out if the loser gets anything.

I've written something like 17 novels, which isn't bad, I suppose, but my father wrote 120 books, my mother 40. In comparison, I'm lazy.

If we look at where relations between the Soviet Union and Germany were in 1945 and where we stand now, then we have achieved so much.

More than anything, you have to respect the game and do things the right way.

Isn't that what love means, to fill ordinary, commonplace, conventional things with magic and significance, not to need the moon and white scent-heavy flowers at night?

If a movie doesn't even have financing yet, they'll do a table read for it at a casting director's office with actors, for the producer and the writer, just to hear if the movie is working.

Never, never rest contented with any circle of ideas, but always be certain that a wider one is still possible.

Before, it was just about making the films - and now it's releasing them. Which is a steep learning curve.

Who cares about my opinions?

Early Bluegrass is my favorite kind of music, not to many people know that.