hbase client包下的AsyncProcess类中的waitForMaximumCurrentTasks方法的疑问

[thefansofjay]

hbase版本是1.0.0，该方法如下
/** Wait until the async does not have more than max tasks in progress. */
private void waitForMaximumCurrentTasks(int max) throws InterruptedIOException {
long lastLog = EnvironmentEdgeManager.currentTime();
long currentInProgress, oldInProgress = Long.MAX_VALUE;
while ((currentInProgress = this.tasksInProgress.get()) > max) {
if (oldInProgress != currentInProgress) { // Wait for in progress to change.
long now = EnvironmentEdgeManager.currentTime();
if (now > lastLog + 10000) {
lastLog = now;
LOG.info("#" + id + ", waiting for some tasks to finish. Expected max="
+ max + ", tasksInProgress=" + currentInProgress);
}
}
oldInProgress = currentInProgress;
try {
synchronized (this.tasksInProgress) {
if (tasksInProgress.get() != oldInProgress) break;
this.tasksInProgress.wait(100);
}
} catch (InterruptedException e) {
throw new InterruptedIOException("#" + id + ", interrupted." +
" currentNumberOfTask=" + currentInProgress);
}
}
}

我的问题是
synchronized (this.tasksInProgress) {
if (tasksInProgress.get() != oldInProgress) break;
this.tasksInProgress.wait(100);
}
这段代码是什么作用，假如max = 0，那么当运行到这的时候，假如tasksInProgress.get() != oldInProgress，break了，那么
此时taskInProgress > 0?百思不得其解，求大神指教。