Detail the memory visibility of Java multi-thread

visibility : A thread's modification of shared variable values can be seen by other threads in a timely manner.

Shared variables : If a variable has a copy in the working memory of multiple threads, then this variable is the number of lines
Shared variables of the process.

Java memory model :

Threads are required to operate on shared variables:

The principle of shared variable visibility implementation:

Requirements for Visibility:

How visibility is implemented: (Final also available)

The process by which threads execute mutually exclusive code:

The concept of reordering :

The concept of as-if-serial:

Causes of shared variables not being visible between threads:

Visibility Analysis:

When a thread accesses one of the sysnchronized (this) synchronization blocks of object, other threads will block access to all other synchronized (this) synchronization blocks in object

Volatile for visibility:

Volatile cannot achieve atomic analysis:

Solutions to ensure the atomicity of the self-increment operation:

Usage of Reentrantlock:

For volatile applications:

Comparison of synchronized and volatile

Detail the memory visibility of Java multi-thread