Comment by okanat
20 hours ago
Creating memory mapped files is a very common OS feature since 90s. Many high level languages have it as OS agnostic POSIX or not.
20 hours ago
Creating memory mapped files is a very common OS feature since 90s. Many high level languages have it as OS agnostic POSIX or not.
> very common OS feature since 90s
And if you want to go farther back, even if it wasn't called "mmap" or a specific function you had to invoke -- there were operating systems that used a "single-level store" (notably MULTICS and IBM's AS/400..err OS/400... err i5 OS... err today IBM i [seriously, IBM, pick a name and stick with it]) where the interface to disk storage on the platform is that the entire disk storage/filesystem is always mapped into the same address space as the rest of your process's memory. Memory-mapped files were basically the only interface there was, and the operating system "magically" persisted certain areas of your memory to permanent storage.