import _thread

from time import ctime, sleep

loops = [4, 2]

def loop(nloop, nsec, lock):

print('start loop', nloop, 'at:', ctime())

sleep(nsec)

print('loop', nloop, 'done at:', ctime())

lock.release()

def main():

print('starting at:', ctime())

locks = []

nloops = range(len(loops))

for _ in nloops:

lock = _thread.allocate_lock()

lock.acquire()

locks.append(lock)

print(locks)

for i in nloops:

_thread.start_new_thread(loop, (i, loops[i], locks[i]))

# 一直等待，直到不满足内层while

for i in nloops:

while locks[i].locked():

pass

print('All Done at:', ctime())

if __name__ == '__main__':

main()