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The highest level of abstraction – Understanding OS-Backed Event Queues, System Calls, and Cross-Platform Abstractions
This is simple, but I wanted to add this just for completeness. Rust standard library wraps the calls to the underlying OS APIs for us, so we don’t have to care about what syscalls to invoke.fn main() { println!(“Hello world from the standard library”);} Congratulations! You’ve now written the same syscall using three levels of abstraction.…
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Using Windows API – Understanding OS-Backed Event Queues, System Calls, and Cross-Platform Abstractions
On Windows, things work a bit differently. While UNIX models almost everything as “files” you interact with, Windows uses other abstractions. On Windows, you get a handle that represents some object you can interact with in specific ways depending on exactly what kind of handle you have. We will use the same main function as…
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CALLING CONVENTION – Understanding OS-Backed Event Queues, System Calls, and Cross-Platform Abstractions
This is the first time we’ve encountered this term, so I’ll go over a brief explanation, even though we dive deeper into this topic later in the book. A calling convention defines how function calls are performed and will, amongst other things, specify: – How arguments are passed into the function – What registers the…
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The next level of abstraction – Understanding OS-Backed Event Queues, System Calls, and Cross-Platform Abstractions
The next level of abstraction is to use the API, which all three operating systems provide for us. We’ll soon see that this abstraction helps us remove some code. In this specific example, the syscall is the same on Linux and on macOS, so we only need to worry if we’re on Windows. We can…
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Raw syscall on macOS – Understanding OS-Backed Event Queues, System Calls, and Cross-Platform Abstractions
Now, since we use instructions that are specific to the CPU architecture, we’ll need different functions depending on if you run an older Mac with an intel CPU or if you run a newer Mac with an Arm 64-based CPU. We only present the one working for the new M series of chips using an…
