diskqueue: fix race condition
diskqueue: fix race condition

philipbo/nsq,dustismo/nsq,datastream/nsq,gaowenbin/nsq,danielhfrank/nsq,msn217/nsq,jehiah/nsq,chaosue/nsq,w4ngyi/nsq,jmptrader/nsq,coderhaoxin/nsq,rpau/nsq,dustismo/nsq,yh453926638/nsq,myhongkongzhen/nsq,JustinAzoff/nsq,xiexingguang/nsq,jsocol/nsq,jehiah/nsq,beni55/nsq,gaowenbin/nsq,bo406/nsq,msn217/nsq,mikedewar/nsq,youxidev/nsq,mreiferson/nsq,wuxu92/nsq,chrislusf/nsq,w4ngyi/nsq,coderhaoxin/nsq,myhongkongzhen/nsq,myhongkongzhen/nsq,fbjork/nsq,sparklxb/nsq,handsomesun/nsq,wmydz1/nsq,gaowenbin/nsq,jlr52/nsq,sparklxb/nsq,msn217/nsq,kevinc0825/nsq,mikeqian/nsq,mashuai/nsq,davegardnerisme/nsq,judwhite/nsq-0.3.2-win,sparklxb/nsq,CrazyJvm/nsq,tophymastery/nsq,myhongkongzhen/nsq,beni55/nsq,CrazyJvm/nsq,propellerads/nsq,Dieterbe/nsq,kesutton/nsq,OlafRadicke/nsq,tophymastery/nsq,coderhaoxin/nsq,absolute8511/nsq,svmehta/nsq,nimmen/nsq,chaosue/nsq,dinedal/nsq,xiexingguang/nsq,propellerads/nsq,jlr52/nsq,bo406/nsq,nsqio/nsq,w4ngyi/nsq,ShinichR/nsq,qinlodestar/nsq,pombredanne/nsq,mroth/nsq,handsomesun/nsq,beni55/nsq,handsomesun/nsq,bitly/nsq,Dieterbe/nsq,qinlodestar/nsq,chrisroberts/nsq,dinedal/nsq,handsomesun/nsq,mikedewar/nsq,magastzheng/nsq,mreiferson/nsq,qinlodestar/nsq,absolute8511/nsq,w3hacker/nsq,w4ngyi/nsq,lcp0578/nsq,davegardnerisme/nsq,propellerads/nsq,coderhaoxin/nsq,sunminghong/nsq,bo406/nsq,xuzhaokui/nsq,nsqio/nsq,mynameisfiber/nsq,wuxu92/nsq,szqh97/nsq,chrislusf/nsq,chrisroberts/nsq,shanemhansen/nsq,yh453926638/nsq,danielhfrank/nsq,sunminghong/nsq,JustinAzoff/nsq,w4ngyi/nsq,lcp0578/nsq,jlr52/nsq,Dieterbe/nsq,w3hacker/nsq,philipbo/nsq,CrazyJvm/nsq,szqh97/nsq,danielhfrank/nsq,nieanan/nsq,jehiah/nsq,bo406/nsq,szqh97/nsq,ShinichR/nsq,MadBomber/nsq,seanluo/nsq_with_note,bitly/nsq,judwhite/nsq-0.3.2-win,yh453926638/nsq,MadBomber/nsq,jlr52/nsq,rpau/nsq,seanluo/nsq_with_note,JustinAzoff/nsq,jehiah/nsq,absolute8511/nsq,szqh97/nsq,ploxiln/nsq,fbjork/nsq,ShinichR/nsq,yh453926638/nsq,coderhaoxin/nsq,nimmen/nsq,datastream/nsq,mreiferson/nsq,jmptrader/nsq,sparklxb/nsq,jsocol/nsq,lcp0578/nsq,wmydz1/nsq,qinlodestar/nsq,jlr52/nsq,CrazyJvm/nsq,wmydz1/nsq,dmarkham/nsq,mashuai/nsq,bo406/nsq,mikeqian/nsq,Dieterbe/nsq,MadBomber/nsq,kesutton/nsq,moander/nsq,mikeqian/nsq,davegardnerisme/nsq,mreiferson/nsq,nieanan/nsq,wuxu92/nsq,youxidev/nsq,mynameisfiber/nsq,bitly/nsq,menghan/nsq,svmehta/nsq,kesutton/nsq,gaowenbin/nsq,ploxiln/nsq,msn217/nsq,xiexingguang/nsq,mashuai/nsq,kesutton/nsq,mashuai/nsq,xiexingguang/nsq,xiexingguang/nsq,myhongkongzhen/nsq,philipbo/nsq,lcp0578/nsq,judwhite/nsq-0.3.2-win,nsqio/nsq,bitly/nsq,wmydz1/nsq,magastzheng/nsq,magastzheng/nsq,dmarkham/nsq,jmptrader/nsq,19hz/nsq,jehiah/nsq,gaowenbin/nsq,nieanan/nsq,chaosue/nsq,pombredanne/nsq,moander/nsq,xuzhaokui/nsq,mikedewar/nsq,beni55/nsq,elubow/nsq,elubow/nsq,kesutton/nsq,wmydz1/nsq,lytics/nsq,mashuai/nsq,OlafRadicke/nsq,rpau/nsq,ShinichR/nsq,xuzhaokui/nsq,mikeqian/nsq,bitly/nsq,absolute8511/nsq,nsqio/nsq,youxidev/nsq,rpau/nsq,OlafRadicke/nsq,lcp0578/nsq,MadBomber/nsq,chaosue/nsq,nsqio/nsq,Dieterbe/nsq,lytics/nsq,MadBomber/nsq,msn217/nsq,chrislusf/nsq,mroth/nsq,philipbo/nsq,beni55/nsq,19hz/nsq,absolute8511/nsq,mikeqian/nsq,sparklxb/nsq,kevinc0825/nsq,szqh97/nsq,mreiferson/nsq,ploxiln/nsq,yh453926638/nsq,kevinc0825/nsq,rpau/nsq,qinlodestar/nsq,menghan/nsq,philipbo/nsq,ShinichR/nsq,handsomesun/nsq,shanemhansen/nsq,chaosue/nsq,CrazyJvm/nsq,ploxiln/nsq,moander/nsq,ploxiln/nsq,19hz/nsq