Samsung Interview Question Applications Developers
Country: United States
Interview Type: In-Person
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This is a shared resource management problem which is typically resolved using counting semaphores. Please note the difference from mutex, semaphores are shared by multiple processes, mutexes are not. And mutxes are like binary semaphore: they are either locked or unlocked and can be in no other state. But a counting semaphore can have any number of counts.
- Anthony Mai February 05, 2016You would start the write semaphore at the count of 2, and start the read semaphore at the count of one.
Each process, when it needs to write to the file, will wait on the semaphore. If the count is less than one, the process is put in a waiting queue and wait for some other process to signal the semaphore. If the count is large then one, the count is reduced by one and the process then proceeds to access the resource. When it is done accessing the resource, it then signals the semaphore, meaning the count is increased by one, so that other processed in the waiting queue can then proceed.
Same happens to the read process. It wait on the semaphore, access the resource, and then signals the semaphore when done.