Quotes About Synchronization

The Work is to bring the outer and the inner into harmony. (p. 103)

Singing duets is instinctive, intuitive.

Rudy Vallee, conductor of the Connecticut Yankees dance orchestra if the 1930's was heart to sing; "My Time is Your Time

The railroads needed standardized time; as a result, the technology of train travel shaped the way everyone gets up, eats, goes to sleep, calculates age, and, perhaps of no small importance, imagine the world as a whole, ticking reliably, with reliable deviations, according to the beat of one central clock in a physical location.

Music has to be treated in the same way as set design, casting, or choice of location - it has to start at the same time.

The whole, tightly coupled system, at the moment of self-organization, begins to act upon its microscopic parts to stimulate further, often much more complex, synchronizations. A continuous stream of information begins flowing back and forth, extremely rapidly, between the macroscopic, ordered whole to the smaller microscopic subunits and back again (interoceptive) so that the self-organizing structure is stabilized, its newly acquired dynamic equilibrium actively maintained.

You must match your energy, your vibration, with that of the universe, bringing it to a higher frequency where it synchronizes with the object, person, or situation you require.

We view dance as a marriage of the representational capacity of language and the rhythmicity of music. This interaction allows people not only to tell stories using their bodies but to do so while synchronizing their movements with others' in a way that fosters social cohesion.

I think the thing that we agreed to so many years ago, actually, was that the music didn't have to support the dance nor the dance illustrate the music, but they could be two things going on at the same time.

Whenever more than one thread accesses a given state variable, and one of them might write to it, they all must coordinate their access to it using synchronization.

Accessing shared, mutable data requires using synchronization; one way to avoid this requirement is to not share. If data is only accessed from a single thread, no synchronization is needed. This technique, thread confinement, is one of the simplest ways to achieve thread safety. When an object is confined to a thread, such usage is automatically thread-safe even if the confined object itself is not.

To ensure thread safety, check-then-act operations (like lazy initialization) and read-modify-write operations (like increment) must always be atomic. We refer collectively to check-then-act and read-modify-write sequences as compound actions: sequences of operations that must be executed atomically in order to remain thread-safe.

The java.util.concurrent.atomic package contains atomic variable classes for effecting atomic state transitions on numbers and object references. By replacing the long counter with an AtomicLong, we ensure that all actions that access the counter state are atomic.

With the exception of immutable objects, it is not safe to use an object that has been initialized by another thread unless the publication happens-before the consuming thread uses it.

Every shared, mutable variable should be guarded by exactly one lock. Make it clear to maintainers which lock that is.

it is a common misconception that synchronized is only about atomicity or demarcating "critical sections". Synchronization also has another significant, and subtle, aspect: memory visibility. We want not only to prevent one thread from modifying the state of an object when another is using it, but also to ensure that when a thread modifies the state of an object, other threads can actually see the changes that were made.

always use the proper synchronization whenever data is shared across threads. 3.1.1.

Then, just as two trees are the same age if they have the same number of tree rings, and just as two samples of glacial sediment are the same age if they have the same percentage of radioactive carbon, two locations in space are passing through the same moment in time when they have the same value of the inflaton field. That's how we set and synchronize clocks in our bubble universe.

Mix the head with the heart, and you're ahead from the start.

Yet accessing a volatile variable performs no locking and so cannot cause the executing thread to block, making volatile variables a lighter-weight synchronization mechanism than synchronized.[5]

If multiple threads access the same mutable state variable without appropriate synchronization, your program is broken. There are three ways to fix it: Don't share the state variable across threads; Make the state variable immutable; or Use synchronization whenever accessing the state variable.

A class is thread-safe if it behaves correctly when accessed from multiple threads, regardless of the scheduling or interleaving of the execution of those threads by the runtime environment, and with no additional synchronization or other coordination on the part of the calling code.

Stateless objects are always thread-safe.

A synchronized block has two parts: a reference to an object that will serve as the lock, and a block of code to be guarded by that lock.