I have some questions regarding the usage and significance of the synchronized keyword Entering a synchronized block, taking out a lock and reading from a volatile are all considered as an acquire and the release of a lock, exiting a synchronized block and writing a volatile are all forms of a release. What is the significance of the synchronized keyword
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When should methods be synchronized
3 synchronized has two effects
First, it is not possible for two invocations of synchronized methods on the same object to interleave When one thread is executing a synchronized method for an object, all other threads that invoke synchronized methods for the same object block (suspend execution) until the first thread is done with the object. Tengo que realizar un proyecto en el que se sincronicen 10 hilos, en el cual son hay 5 hilos de ping y 5 hilos de pong Uno debe de imprimir ping, y otro pong y lo deben de imprimir alternadame.
When we use this block, we mean that we are willing to wait until the thread using this monitor, releases it. For synchronized methods, the lock will be held throughout the method scope, while in the synchronized block, the lock is held only during that block scope (otherwise known as critical section). The synchronized block implements its synchronization through a sequence of bytecode operations stored in the class file's definition of the method So the synchronized method might potentially execute slightly faster and take up less space in terms of bytecode
Again, the two are, by specification, functionally identical.
Likewise, entering a synchronized block requires locking the this object of the method This means that a synchronized method (or block) can be executing in multiple threads at the same time if they are locking on different objects, but only one thread can execute a synchronized method (or block) at a time for any given single object.
