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Global interpreter lock
Global interpreter lock (GIL) is a mechanism used in computer language interpreters to synchronize the execution of threads so that only one native thread can execute at a time〔(【引用サイトリンク】url=https://wiki.python.org/moin/GlobalInterpreterLock )〕. An interpreter that uses GIL always allows exactly one thread to execute at a time, even if run on a multi-core processor. Some popular interpreters that have GIL are CPython and Ruby MRI.
==Technical background concepts==
A global interpreter lock (GIL) is a mutual-exclusion lock held by a programming language interpreter thread to avoid sharing code that is not thread-safe with other threads. In implementations with a GIL, there is always one GIL for each interpreter process. Python and Ruby MRI use GILs.
Applications running on implementations with a GIL can be designed to use separate processes to achieve full parallelism, as each process has its own interpreter and in turn has its own GIL. Otherwise, the GIL can be a significant barrier to parallelism, a price paid for having the dynamism of the language.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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