How property system works on Android

* blue rect represents a process

* orange rest represents a shaered memory

simple description in my words

0> property service creates a shared memory with any property customer process which'll read property.

1> property service loads the pre-defined properties into shared memory.

2> property customer process will mmap the shared memory to use properties

3> property setter process can not set a property directly.

4> setter process pass a property to property service through linux domian socket. and those properties are saved into persistent file.

5> property service can write a property into the shared memory

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