2024每日刷题（182）

Leetcode—1117. H2O 生成

C++实现代码

class H2O {
public:
    H2O() {
        sem_init(&hydrogenSem, 0, 1);
        sem_init(&oxygenSem, 0, 0);
    }

    ~H2O() {
        sem_destroy(&hydrogenSem);
        sem_destroy(&oxygenSem);
    }
    

    void hydrogen(function<void()> releaseHydrogen) {
        sem_wait(&hydrogenSem);
        ++n;
        // releaseHydrogen() outputs "H". Do not change or remove this line.
        releaseHydrogen();
        if(n % 2 == 0) {
            sem_post(&oxygenSem);
        } else {
            sem_post(&hydrogenSem);
        }
    }

    void oxygen(function<void()> releaseOxygen) {
        sem_wait(&oxygenSem);
        // releaseOxygen() outputs "O". Do not change or remove this line.
        releaseOxygen();
        sem_post(&hydrogenSem);
    }
private:
    int n = 0;
    sem_t hydrogenSem;
    sem_t oxygenSem;
};

运行结果

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