Why does Linux extensively use the `static` keyword to modify function and struct definitions?
Q: Why does Linux extensively use the static keyword to modify function and struct definitions?
The Linux kernel code heavily uses the static keyword; it's seen everywhere, whether for functions or struct definitions. What is the purpose of doing this? And how should multi-threaded data sharing and thread-specific data content be considered?
A:
I personally believe it's because Linux is written in C, and its codebase is enormous, making name conflicts prone to occur. Therefore, static is used to reduce the incidence of such conflicts.
Using static reduces the scope of functions or variables.
The access scope for static functions is file-level, whereas ordinary functions have project-level scope.
The C language doesn't have namespaces, so static is probably used to mitigate conflicts.
- Similar to the two previous points,
staticcan reduce the usage of functions, thereby facilitating maintenance (avoiding modifications in multiple places simultaneously). However, this also compromises the structural integrity of classes, and my boss has always discouraged me from usingstaticinterfaces. I've always felt that C++ is a language that emphasizes structure. While performance is crucial, C++ places more importance on interface usage, where good design leads to good performance and extensibility. This is somewhat different from the C language, isn't it?
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