网络编程之多线程——GIL全局说明器锁

一、引子

定义：
In CPython, the global interpreter lock, or GIL, is a mutex that prevents multiple 
native threads from executing Python bytecodes at once. This lock is necessary mainly 
because CPython’s memory management is not thread-safe. (However, since the GIL 
exists, other features have grown to depend on the guarantees that it enforces.)

结论：在Cpython说明器中，同一个进程下开启的多线程，同一时刻只能有一个线程履行，没法应用多核优势定义：
In CPython, the globa