[concurrency-interest] ThreadPoolExecutor implement question!
yangjs
yangjs at alibaba-inc.com
Thu Sep 21 02:29:55 EDT 2006
hi,all
when I read ThreadPoolExecutor code ,I found it's declare the mainLock use "final" ,
private final ReentrantLock mainLock = new ReentrantLock();
many method use the lock guarding state, use case as follow:
final ReentrantLock mainLock = this.mainLock;
mainLock.lock();
try {
// some code
} finally {
mainLock.unlock();
}
My question is the instance field already use "final" to mainLock,
why every method need copy mainLock reference to final local var.
this puzzle me,who can tell me why ? thanks.
Best regards,
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