lib/std/Io.zig          |  42 ++++++-
 lib/std/Io/File.zig     |  44 +++++++
 lib/std/Io/Threaded.zig | 217 ++++++++++++++++++++++++++++++++
 lib/std/posix.zig       |  93 --------------
 4 files changed, 301 insertions(+), 95 deletions(-)