LeetCode 多线程 1115. 交替打印FooBar

1115. 交替打印FooBar

Ideas

交替锁的设计，两把锁，foo执行的时候把foo lock acquire，print完了只有把bar lock release，这样foo就得等着，然后bar执行的时候把bar lock acquire，print完了之后把foo lock release，这样就能交替打印foo和bar了。

Code Python

from threading import Lock class FooBar: def __init__(self, n): self.n = n
        self.print_foo = Lock() self.print_bar = Lock() self.print_bar.acquire() def foo(self, printFoo: 'Callable[[], None]') -> None: for i in range(self.n): self.print_foo.acquire() # printFoo() outputs "foo". Do not change or remove this line. printFoo() self.print_bar.release() def bar(self, printBar: 'Callable[[], None]') -> None: for i in range(self.n): self.print_bar.acquire() # printBar() outputs "bar". Do not change or remove this line. printBar() self.print_foo.release()