- remove file_size parameter from MemoryMap.write
- remove requirement for mapping length to be aligned
- align allocated fallback memory
- add unit test for std.Io.Threaded.disable_memory_mapping = true
- add unit test for MemoryMap.setLength
- change offset to u64
- make len non-optional
- make write take a file_size parameter
- std.Io.Threaded: introduce disable_memory_mapping flag to force it to
take the fallback path.
Additionally:
- introduce BlockSize to File.Stat. On Windows, based on cached call to
NtQuerySystemInformation. On unsupported OS's, set to 1.
- support File.NLink on Windows. this was available the whole time, we
just didn't see the field at first.
- remove EBADF / INVALID_HANDLE from reading/writing file error sets
by defining the pointer contents to only be synchronized after explicit
sync points, makes it legal to have a fallback implementation based on
file operations while still supporting a handful of use cases for memory
mapping.
furthermore, it makes it legal for evented I/O implementations to use
evented file I/O for the sync points rather than memory mapping.
not yet done:
- implement checking the length when options.len is null
- some windows impl work
- some wasi impl work
- unit tests
- integration with compiler
