|Code| IPC methods

Originally, I though it is a basic interview question and everyone has at least a common answer .
Until I found someone did not know , I know I was wrong.

Threads can shares the same resources such as address space, file descriptors, stack and other process related attributes in the same process.
Processes can not share resources directly.

Processes will communicate to each other by IPC method.
There are two ways:
 1. Shared Memory
 2. Message passing

The following methods, which we often see, belong to message passing.
Remote Procedural calls (RPCs)


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