Motivation:
Many network protocols (especially for example NFS) have quite a number
of integer values next to each other. In NIO, you'd normally parse/write
them with multiple read/writeInteger calls.
Unfortunately, that's a bit wasteful because we're checking the bounds
as well as the CoW state every time.
Modifications:
- Provide read/writeMultipleIntegers for up to 15 FixedWidthIntegers.
- Benchmarks
Result:
Faster code. For 10 UInt32s, this is a 5x performance win on my machine,
see benchmarks.
Motivation:
Swift 5.5 provides concurrency support on almost all platforms where it
is available. However, the Xcode 13 GM currently provides a macOS 11 SDK
with Swift 5.5, and the concurrency features are not available in that
SDK. As a result, NIO's concurrency features cause compile errors when
building the concurrency library on macOS using Xcode 13 GM.
Modifications:
- Only build the concurrency features when the concurrency library is
present.
Result:
We can build NIO using Xcode 13 GM.
Motivation:
Xcode 13 GM shipped with a Swift overlay for libsystem in macOS that
marked free's first argument as non-nullable. This leads to an awkward
breakage for us, because we're trying to hold a reference to free as a
function pointer, and to do that we had an explicit type annotation.
We'd like to keep NIO compiling in Xcode 13 GM.
Modifications:
- Defined the free function as a thunk that passes through to the
underlying OS free call, but takes its first argument as non-nullable.
Result:
Should compile on the Xcode 13 GM again.
Motivation:
The remaining NIO code really conceptually belongs in a module called
NIOPosix, and NIOCore should really be called NIO. We can't really do
that last step, but we can prepare by pushing the bulk of the remaining
code into a module called NIOPosix.
Modifications:
- Move NIO to NIOPosix
- Make NIO an umbrella module.
Result:
NIOPosix exists.
Johannes Weiss