Make the load of _aliveVMs synchronized with the decrementation
Make the load of _aliveVMs synchronized with the decrementation

* To avoid any possible race condition

mozart/mozart2,Angeldude/mozart2,dianacgr/mozart2,layus/mozart2,yjaradin/mozart2,eregon/mozart2,mozart/mozart2,mozart/mozart2,Angeldude/mozart2,eregon/mozart2,yjaradin/mozart2,layus/mozart2,yjaradin/mozart2,dianacgr/mozart2,dianacgr/mozart2,layus/mozart2,Angeldude/mozart2,eregon/mozart2