java - 在 Java 中递增信号量许可

Question

我可以向 Java 中的信号量添加更多许可吗？

Semaphore s = new Semaphore(3);

在代码的某处之后，我想将许可更改为 4。这可能吗？

Answer 1

是的。 release方法(混淆地命名为 imo)可用于增加许可，因为来自文档:

There is no requirement that a thread that releases a permit must 
have acquired that permit by calling acquire. 
Correct usage of a semaphore is established by programming convention
in the application. 

换句话说:

semaphore.release(10);

如果线程调用未获得任何许可，将再添加 10 个许可。