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Your most interesting-looking example, the one with u = (u ) It is undefined you cannot reason about the behavior. If the undefined behavior changes when one of the involved variables is declared volatile, that doesn't prove or change anything. There is no problem, there is no "should" involved. So, with that in mind, why are these "issues"? The language clearly says that certain things lead to undefined behavior. Sleeping barber program in c code#requiring that all implementations handle integer overflow in the exact same way, which would very likely impose serious performance costs, they just left the behavior undefined so that if you write code that causes integer overflow, anything can happen. In my mind, it's simply because the language designers wanted there to be some leeway in the semantics, instead of i.e. some language constructs are syntactically valid but you can't predict the behavior when the code is run.Īs far as I know, the standard doesn't explicitly say why the concept of undefined behavior exists. Public static Semaphore Bouncer is leaving the nightclub.", args) Ĭ has the concept of undefined behavior, i.e. Here is a very pedagogic example in C# :-) using System For example, to limit the number of simultaneous calls to a database in an application. It's simply a way to limit the number of consumers for a specific resource. Sleeping barber program in c full#If the club is full no one is allowed to enter, but as soon as one person leaves another person might enter. There are a dedicated number of people that are allowed in the club at once. Think of semaphores as bouncers at a nightclub. Printf("The barber is going home for the day.\n") Release the customer when done cutting. Printf("The barber has finished cutting hair.\n") Take a random amount of time to cut the Sleep until someone arrives and wakes you. customers still on the way to his shop. Our barber is omnicient and can tell if there are While there are still customers to be serviced. Printf("Customer %d leaving barber shop.\n", num) Wait for the barber to finish cutting your hair. Printf("Customer %d waking the barber.\n", num) Sleeping barber program in c free#The chair is free so give up your spot in the Wait for the barber chair to become free. Printf("Customer %d entering waiting room.\n", num) Wait for space to open up in the waiting room. Printf("Customer %d arrived at barber shop.\n", num) ![]() Printf("Customer %d leaving for barber shop.\n", num) Leave for the shop and take some random amount of Sem_post(
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