Python 简单的线程问题

代码如下：

import _thread as thread

stdoutmutex = thread.allocate_lock()
exitmutexes = [thread.allocate_lock() for i in range(10)]


def counter(myId, count):
    for i in range(count):
        print('1 %s -> %s' % (myId, stdoutmutex.locked()))
        stdoutmutex.acquire()
        print('2 %s -> %s' % (myId, stdoutmutex.locked()))
        print(stdoutmutex.locked())
        print('[%s] => %s' % (myId, i))
        stdoutmutex.release()
    exitmutexes[myId].acquire()


for i in range(10):
    thread.start_new_thread(counter, (i, 10))
for mutex in exitmutexes:
    while not mutex.locked(): pass
print('Main thread exiting')

问题： exitmutexes[myId].acquire()获得了锁的状态，while not mutex.locked(): pass 判断没有锁的话就继续执行，但我不知道什么时候释放的锁。 谢谢大家了！