Leetcode Problem 1117. Building H2O

1117. Building H2O

Leetcode Solutions

Semaphore-based Synchronization for Water Molecule Formation

  1. Initialize two semaphores: hydrogenSemaphore with a count of 2 and oxygenSemaphore with a count of 0.
  2. In the hydrogen method, a hydrogen thread will attempt to acquire the hydrogenSemaphore.
  3. Once the semaphore is acquired, the releaseHydrogen function is called to output 'H'.
  4. After releasing hydrogen, the thread releases the oxygenSemaphore to signal that one part of the water molecule is ready.
  5. In the oxygen method, an oxygen thread will wait to acquire the oxygenSemaphore twice, ensuring that two hydrogen threads have signaled readiness.
  6. Once acquired, the releaseOxygen function is called to output 'O'.
  7. The oxygen thread then releases the hydrogenSemaphore twice, allowing the next set of hydrogen threads to proceed.
  8. This process repeats, ensuring that for every oxygen thread that proceeds, two hydrogen threads are ready, thus maintaining the H2O ratio.
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Barrier-based Synchronization for Water Molecule Formation

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