"One-minute knowledge" thread synchronization, thread scheduling

"One-minute knowledge" thread synchronization, thread scheduling

The difference between the sleep () and yield () methods of a thread

1

The sleep () method gives the other threads an opportunity to run without taking into account the priority of the thread, thus giving the lower-priority thread the chance of running;

The yield () method only gives the same priority or higher priority threads the opportunity to run;

2

Thread executes the sleep () method into a blocking (blocked) state,

The execution of the yield () method is then transferred to the Ready (ready) state;

3

The sleep () method declaration throws Interruptedexception,

The yield () method does not declare any exceptions;

4

The sleep () method is more portable than the yield () method (associated with operating system CPU scheduling).

Thread synchronization and thread scheduling-related methods

Wait ()

Causes a thread to be in a waiting (blocking) state and release the lock of the object being held;

Sleep ()

To make a running thread sleep, a static method that calls this method to handle the interruptedexception exception;

Notify ()

Waking a waiting state, of course, when calling this method, does not exactly wake up a waiting state of the thread, but rather by the JVM to determine which thread to wake, regardless of priority;

Notityall ()

Wakes all waiting-state threads, not locking objects to all threads, but letting them compete, and only the thread that gets the lock can enter the ready state;