1.鎖對象的Mark Word:
2.鎖升級過程:
3.參數設置
啓用自旋:-XX:+UseSpinning 禁用自旋:-XX:-UseSpinning 設置自旋次數:-XX:PreBlockSpin(默認是10次) 啓用偏向鎖:-XX:+UseBiasedLocking 禁用偏向鎖:-XX:-UseBiasedLocking
啓用自旋:-XX:+UseSpinning 禁用自旋:-XX:-UseSpinning 設置自旋次數:-XX:PreBlockSpin(默認是10次) 啓用偏向鎖:-XX:+UseBiasedLocking 禁用偏向鎖:-XX:-UseBiasedLocking