We want to use a semaphore to ensure that a process that creates a single thread waits until the thread finishes before continuing. To do this, we will have the process call sem_wait() after creating the thread and the child will call sem_post() after it finishes. We are unsure what to initialize the semaphore to, but we decide on -1. What will be the result?

Question

We want to use a semaphore to ensure that a process that creates a single thread waits until the thread finishes before continuing. To do this, we will have the process call  sem_wait()  after creating the thread and the child will call  sem_post()  after it finishes. We are unsure what to initialize the semaphore to, but we decide on -1. What will be the result?

Accepted Answer

Our code will only work if the child runs after its parent calls  sem_wait() , the code will work. Since other options are possible, it does not work in general.

Answer

Our code will only work if the child runs immediately after is it created and before its parent calls  sem_wait() , the code will work. Since other options are possible, it does not work in general.

Answer

Since threads always run immediately after they are created, our code will work.

Answer

Since threads never run immediately after they are created, our code will work.

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We want to use a semaphore to ensure that a process that creates a single thread...

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