Java Synchronization 偏向锁, 轻量锁, 重量锁
占坑, 这里讲的不错 https://wiki.openjdk.java.net/display/HotSpot/Synchronization
Sun Lab 最初引入偏向锁的讲座 (Eliminating Synchronization- Related Atomic Operations with Biased Locking and Bulk Rebiasing)
https://pdfs.semanticscholar.org/bc8f/7a35b87b452924e180ed15b58f049bcac9db.pdf