Fix bwtree GC wrapper to let it call non-blocking function
Fix bwtree GC wrapper to let it call non-blocking function

cmu-db/peloton,phisiart/peloton-p3,cmu-db/peloton,vittvolt/peloton,haojin2/peloton,cmu-db/peloton,cmu-db/peloton,apavlo/peloton,AngLi-Leon/peloton,yingjunwu/peloton,AngLi-Leon/peloton,PauloAmora/peloton,seojungmin/peloton,jessesleeping/iso_peloton,ShuxinLin/peloton,haojin2/peloton,yingjunwu/peloton,AllisonWang/peloton,vittvolt/15721-peloton,malin1993ml/peloton,apavlo/peloton,wangziqi2016/peloton,yingjunwu/peloton,jessesleeping/iso_peloton,wangziqi2016/peloton,apavlo/peloton,yingjunwu/peloton,vittvolt/15721-peloton,eric-haibin-lin/peloton-1,ShuxinLin/peloton,eric-haibin-lin/peloton-1,AngLi-Leon/peloton,wangziqi2016/peloton,prashasthip/peloton,haojin2/peloton,yingjunwu/peloton,prashasthip/peloton,PauloAmora/peloton,malin1993ml/peloton,eric-haibin-lin/peloton-1,seojungmin/peloton,malin1993ml/peloton,ShuxinLin/peloton,AllisonWang/peloton,wangziqi2016/peloton,eric-haibin-lin/peloton-1,yingjunwu/peloton,AllisonWang/peloton,eric-haibin-lin/peloton-1,ShuxinLin/peloton,PauloAmora/peloton,AngLi-Leon/peloton,haojin2/peloton,phisiart/peloton-p3,seojungmin/peloton,haojin2/peloton,PauloAmora/peloton,malin1993ml/peloton,jessesleeping/iso_peloton,seojungmin/peloton,jessesleeping/iso_peloton,apavlo/peloton,ShuxinLin/peloton,eric-haibin-lin/peloton-1,vittvolt/peloton,apavlo/peloton,vittvolt/15721-peloton,phisiart/peloton-p3,AngLi-Leon/peloton,cmu-db/peloton,vittvolt/15721-peloton,wangziqi2016/peloton,jessesleeping/iso_peloton,AllisonWang/peloton,prashasthip/peloton,PauloAmora/peloton,seojungmin/peloton,seojungmin/peloton,wangziqi2016/peloton,vittvolt/peloton,jessesleeping/iso_peloton,prashasthip/peloton,AllisonWang/peloton,apavlo/peloton,vittvolt/15721-peloton,malin1993ml/peloton,vittvolt/peloton,phisiart/peloton-p3,vittvolt/15721-peloton,cmu-db/peloton,ShuxinLin/peloton,haojin2/peloton,PauloAmora/peloton,prashasthip/peloton,vittvolt/peloton,malin1993ml/peloton,AllisonWang/peloton,vittvolt/peloton,phisiart/peloton-p3,jessesleeping/iso_peloton,phisiart/peloton-p3,AngLi-Leon/peloton,prashasthip/peloton