ant并行执行打包任务

<target name="parallel" depends="clean, update" description="并行执行打包任务">
<parallel failonany="true">
  <antcall target='a.package' />
  <antcall target='b.db.package' />
  <antcall target='source' />
</parallel>
<antcall target='showinfo' />
</target>