python中上雙互斥鎖的執行緒執行流程

import threading

def sing():
print('進入sing -----------------')
for i in range(3):
print('進入sing迴圈 -----------------')
l1.acquire()
print('sing上鎖 -----------------')
print('唱歌。。。')
try:
print('dance解鎖 -----------------')
l2.release()
print('dance解鎖成功 -----------------')
except exception:
print('sing中dance解鎖失敗，重新開始迴圈----------------')
pass
def dance():
print('進入dance -----------------')
for i in range(3):
print('進入dance迴圈 -----------------')
l2.acquire()
print('dance上鎖 -----------------')
print('跳舞。。。')
try:
print('sing解鎖 -----------------')
l1.release()
print('sing解鎖成功 -----------------')
except exception:
print('dance中sing解鎖失敗，重新開始迴圈----------------')
pass
if __name__ == '__main__':
# sing()
# dance()
l1 = threading.lock()
print(l1)
l2 = threading.lock()
print(l2)
t1 = threading.thread(target=sing)
t2 = threading.thread(target=dance)
print('執行緒建立完畢--------')
t1.start()
print('執行緒1開始執行------')
t2.start()
print('執行緒2開始執行------')
t1.join()
print('執行緒1守護主線程-----')
t2.join()
print('執行緒2守護主線程-----')
				
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