lib/compiler/build_runner.zig                       |  2 +-
 lib/std/Build/Cache.zig                             |  8 ++--
 lib/std/Build/Step/Options.zig                      |  2 +-
 lib/std/Io.zig                                      |  1 +
 lib/std/Io/Threaded.zig                             | 46 ++++++++++++++++++++++
 lib/std/fs/test.zig                                 |  2 +-
 lib/std/os/windows.zig                              | 28 -------------
 lib/std/os/windows/kernel32.zig                     |  6 ---
 lib/std/os/windows/ntdll.zig                        |  5 +++
 lib/std/posix.zig                                   | 34 ----------------
 lib/std/process.zig                                 | 67 +++++++++++++-------------------
 src/Compilation.zig                                 |  2 +-
 src/introspect.zig                                  | 12 +++---
 src/main.zig                                        | 10 ++---
 test/standalone/child_process/main.zig              | 16 ++++----
 test/standalone/posix/cwd.zig                       | 27 ++++++-------
 test/standalone/self_exe_symlink/create-symlink.zig |  2 +-
 test/standalone/windows_paths/relative.zig          |  2 +-
 test/standalone/windows_paths/test.zig              |  2 +-
 test/standalone/windows_spawn/main.zig              |  2 +-
 tools/doctest.zig                                   |  2 +-
 tools/incr-check.zig                                |  2 +-
 tools/process_headers.zig                           |  2 +-
 tools/update-linux-headers.zig                      |  2 +-
 24 files changed, 128 insertions(+), 156 deletions(-)