give common blocking functions a clear name

Sources/NIOCore/EventLoopFuture.swift

@@ -2,7 +2,7 @@
 //
 // This source file is part of the SwiftNIO open source project
 //
-// Copyright (c) 2017-2020 Apple Inc. and the SwiftNIO project authors
+// Copyright (c) 2017-2024 Apple Inc. and the SwiftNIO project authors
 // Licensed under Apache License v2.0
 //
 // See LICENSE.txt for license information
@@ -1048,11 +1048,12 @@ extension EventLoopFuture {
     @preconcurrency
     @inlinable
     public func wait(file: StaticString = #file, line: UInt = #line) throws -> Value where Value: Sendable {
-        try self._wait(file: file, line: line)
+        try self._blockingWaitForFutureCompletion(file: file, line: line)
     }
 
     @inlinable
-    func _wait(file: StaticString, line: UInt) throws -> Value where Value: Sendable {
+    @inline(never)
+    func _blockingWaitForFutureCompletion(file: StaticString, line: UInt) throws -> Value where Value: Sendable {
         self.eventLoop._preconditionSafeToWait(file: file, line: line)
 
         let v: UnsafeMutableTransferBox<Result<Value, Error>?> = .init(nil)

Sources/NIOCore/SystemCallHelpers.swift

@@ -2,7 +2,7 @@
 //
 // This source file is part of the SwiftNIO open source project
 //
-// Copyright (c) 2017-2021 Apple Inc. and the SwiftNIO project authors
+// Copyright (c) 2017-2024 Apple Inc. and the SwiftNIO project authors
 // Licensed under Apache License v2.0
 //
 // See LICENSE.txt for license information
@@ -60,7 +60,8 @@ private let sysGetifaddrs: @convention(c) (UnsafeMutablePointer<UnsafeMutablePoi
 #endif
 #endif
 
-private func isUnacceptableErrno(_ code: Int32) -> Bool {
+@inlinable
+internal func isUnacceptableErrno(_ code: Int32) -> Bool {
     switch code {
     case EFAULT, EBADF:
         return true
@@ -69,7 +70,8 @@ private func isUnacceptableErrno(_ code: Int32) -> Bool {
     }
 }
 
-private func preconditionIsNotUnacceptableErrno(err: CInt, where function: String) {
+@inlinable
+internal func preconditionIsNotUnacceptableErrno(err: CInt, where function: String) {
     // strerror is documented to return "Unknown error: ..." for illegal value so it won't ever fail
     precondition(
         !isUnacceptableErrno(err),
@@ -126,6 +128,7 @@ enum SystemCalls {
     #endif
 
     @inline(never)
+    @usableFromInline
     internal static func close(descriptor: CInt) throws {
         let res = sysClose(descriptor)
         if res == -1 {
@@ -150,6 +153,7 @@ enum SystemCalls {
     }
 
     @inline(never)
+    @usableFromInline
     internal static func open(
         file: UnsafePointer<CChar>,
         oFlag: CInt,
@@ -170,6 +174,7 @@ enum SystemCalls {
 
     @discardableResult
     @inline(never)
+    @usableFromInline
     internal static func lseek(descriptor: CInt, offset: off_t, whence: CInt) throws -> off_t {
         try syscall(blocking: false) {
             sysLseek(descriptor, offset, whence)
@@ -178,6 +183,7 @@ enum SystemCalls {
 
     #if os(Windows)
     @inline(never)
+    @usableFromInline
     internal static func read(
         descriptor: CInt,
         pointer: UnsafeMutableRawPointer,
@@ -189,6 +195,7 @@ enum SystemCalls {
     }
     #elseif !os(WASI)
     @inline(never)
+    @usableFromInline
     internal static func read(
         descriptor: CInt,
         pointer: UnsafeMutableRawPointer,
@@ -202,6 +209,7 @@ enum SystemCalls {
 
     #if !os(WASI)
     @inline(never)
+    @usableFromInline
     internal static func if_nametoindex(_ name: UnsafePointer<CChar>?) throws -> CUnsignedInt {
         try syscall(blocking: false) {
             sysIfNameToIndex(name!)
@@ -210,6 +218,7 @@ enum SystemCalls {
 
     #if !os(Windows)
     @inline(never)
+    @usableFromInline
     internal static func getifaddrs(_ addrs: UnsafeMutablePointer<UnsafeMutablePointer<ifaddrs>?>) throws {
         _ = try syscall(blocking: false) {
             sysGetifaddrs(addrs)

Sources/NIOPosix/BSDSocketAPICommon.swift

@@ -2,7 +2,7 @@
 //
 // This source file is part of the SwiftNIO open source project
 //
-// Copyright (c) 2020-2022 Apple Inc. and the SwiftNIO project authors
+// Copyright (c) 2020-2024 Apple Inc. and the SwiftNIO project authors
 // Licensed under Apache License v2.0
 //
 // See LICENSE.txt for license information
@@ -31,6 +31,7 @@ protocol _SocketShutdownProtocol {
     var cValue: CInt { get }
 }
 
+@usableFromInline
 internal enum Shutdown: _SocketShutdownProtocol {
     case RD
     case WR
@@ -47,6 +48,7 @@ extension NIOBSDSocket {
 
 extension NIOBSDSocket {
     /// Specifies the type of socket.
+    @usableFromInline
     internal struct SocketType: RawRepresentable {
         public typealias RawValue = CInt
         public var rawValue: RawValue

Sources/NIOPosix/BaseSocket.swift

@@ -2,7 +2,7 @@
 //
 // This source file is part of the SwiftNIO open source project
 //
-// Copyright (c) 2017-2021 Apple Inc. and the SwiftNIO project authors
+// Copyright (c) 2017-2024 Apple Inc. and the SwiftNIO project authors
 // Licensed under Apache License v2.0
 //
 // See LICENSE.txt for license information
@@ -22,6 +22,7 @@ import let WinSDK.EBADF
 import struct WinSDK.socklen_t
 #endif
 
+@usableFromInline
 protocol Registration {
     /// The `SelectorEventSet` in which the `Registration` is interested.
     var interested: SelectorEventSet { get set }

Sources/NIOPosix/IO.swift

@@ -2,7 +2,7 @@
 //
 // This source file is part of the SwiftNIO open source project
 //
-// Copyright (c) 2017-2021 Apple Inc. and the SwiftNIO project authors
+// Copyright (c) 2017-2024 Apple Inc. and the SwiftNIO project authors
 // Licensed under Apache License v2.0
 //
 // See LICENSE.txt for license information
@@ -24,6 +24,7 @@ extension IOResult where T: FixedWidthInteger {
 }
 
 /// An result for an IO operation that was done on a non-blocking resource.
+@usableFromInline
 enum IOResult<T: Equatable>: Equatable {
 
     /// Signals that the IO operation could not be completed as otherwise we would need to block.

Sources/NIOPosix/Linux.swift

@@ -2,7 +2,7 @@
 //
 // This source file is part of the SwiftNIO open source project
 //
-// Copyright (c) 2017-2021 Apple Inc. and the SwiftNIO project authors
+// Copyright (c) 2017-2024 Apple Inc. and the SwiftNIO project authors
 // Licensed under Apache License v2.0
 //
 // See LICENSE.txt for license information
@@ -18,11 +18,13 @@
 #if os(Linux) || os(Android)
 import CNIOLinux
 
+@usableFromInline
 internal enum TimerFd {
     internal static let TFD_CLOEXEC = CNIOLinux.TFD_CLOEXEC
     internal static let TFD_NONBLOCK = CNIOLinux.TFD_NONBLOCK
 
     @inline(never)
+    @usableFromInline
     internal static func timerfd_settime(
         fd: CInt,
         flags: CInt,
@@ -35,16 +37,21 @@ internal enum TimerFd {
     }
 
     @inline(never)
+    @usableFromInline
     internal static func timerfd_create(clockId: CInt, flags: CInt) throws -> CInt {
         try syscall(blocking: false) {
             CNIOLinux.timerfd_create(clockId, flags)
         }.result
     }
 }
 
+@usableFromInline
 internal enum EventFd {
+    @usableFromInline
     internal static let EFD_CLOEXEC = CNIOLinux.EFD_CLOEXEC
+    @usableFromInline
     internal static let EFD_NONBLOCK = CNIOLinux.EFD_NONBLOCK
+    @usableFromInline
     internal typealias eventfd_t = CNIOLinux.eventfd_t
 
     @inline(never)
@@ -55,6 +62,7 @@ internal enum EventFd {
     }
 
     @inline(never)
+    @usableFromInline
     internal static func eventfd_read(fd: CInt, value: UnsafeMutablePointer<UInt64>) throws -> CInt {
         try syscall(blocking: false) {
             CNIOLinux.eventfd_read(fd, value)
@@ -73,40 +81,65 @@ internal enum EventFd {
     }
 }
 
+@usableFromInline
 internal enum Epoll {
+    @usableFromInline
     internal typealias epoll_event = CNIOLinux.epoll_event
 
+    @usableFromInline
     internal static let EPOLL_CTL_ADD: CInt = numericCast(CNIOLinux.EPOLL_CTL_ADD)
+    @usableFromInline
     internal static let EPOLL_CTL_MOD: CInt = numericCast(CNIOLinux.EPOLL_CTL_MOD)
+    @usableFromInline
     internal static let EPOLL_CTL_DEL: CInt = numericCast(CNIOLinux.EPOLL_CTL_DEL)
 
     #if canImport(Android) || canImport(Musl)
+    @usableFromInline
     internal static let EPOLLIN: CUnsignedInt = numericCast(CNIOLinux.EPOLLIN)
+    @usableFromInline
     internal static let EPOLLOUT: CUnsignedInt = numericCast(CNIOLinux.EPOLLOUT)
+    @usableFromInline
     internal static let EPOLLERR: CUnsignedInt = numericCast(CNIOLinux.EPOLLERR)
+    @usableFromInline
     internal static let EPOLLRDHUP: CUnsignedInt = numericCast(CNIOLinux.EPOLLRDHUP)
+    @usableFromInline
     internal static let EPOLLHUP: CUnsignedInt = numericCast(CNIOLinux.EPOLLHUP)
     #if canImport(Android)
+    @usableFromInline
     internal static let EPOLLET: CUnsignedInt = 2_147_483_648  // C macro not imported by ClangImporter
     #else
+    @usableFromInline
     internal static let EPOLLET: CUnsignedInt = numericCast(CNIOLinux.EPOLLET)
     #endif
     #elseif os(Android)
+    @usableFromInline
     internal static let EPOLLIN: CUnsignedInt = 1  //numericCast(CNIOLinux.EPOLLIN)
+    @usableFromInline
     internal static let EPOLLOUT: CUnsignedInt = 4  //numericCast(CNIOLinux.EPOLLOUT)
+    @usableFromInline
     internal static let EPOLLERR: CUnsignedInt = 8  // numericCast(CNIOLinux.EPOLLERR)
+    @usableFromInline
     internal static let EPOLLRDHUP: CUnsignedInt = 8192  //numericCast(CNIOLinux.EPOLLRDHUP)
+    @usableFromInline
     internal static let EPOLLHUP: CUnsignedInt = 16  //numericCast(CNIOLinux.EPOLLHUP)
+    @usableFromInline
     internal static let EPOLLET: CUnsignedInt = 2_147_483_648  //numericCast(CNIOLinux.EPOLLET)
     #else
+    @usableFromInline
     internal static let EPOLLIN: CUnsignedInt = numericCast(CNIOLinux.EPOLLIN.rawValue)
+    @usableFromInline
     internal static let EPOLLOUT: CUnsignedInt = numericCast(CNIOLinux.EPOLLOUT.rawValue)
+    @usableFromInline
     internal static let EPOLLERR: CUnsignedInt = numericCast(CNIOLinux.EPOLLERR.rawValue)
+    @usableFromInline
     internal static let EPOLLRDHUP: CUnsignedInt = numericCast(CNIOLinux.EPOLLRDHUP.rawValue)
+    @usableFromInline
     internal static let EPOLLHUP: CUnsignedInt = numericCast(CNIOLinux.EPOLLHUP.rawValue)
+    @usableFromInline
     internal static let EPOLLET: CUnsignedInt = numericCast(CNIOLinux.EPOLLET.rawValue)
     #endif
 
+    @usableFromInline
     internal static let ENOENT: CUnsignedInt = numericCast(CNIOLinux.ENOENT)
 
     @inline(never)
@@ -130,6 +163,7 @@ internal enum Epoll {
     }
 
     @inline(never)
+    @usableFromInline
     internal static func epoll_wait(
         epfd: CInt,
         events: UnsafeMutablePointer<epoll_event>,

Sources/NIOPosix/MultiThreadedEventLoopGroup.swift

@@ -2,7 +2,7 @@
 //
 // This source file is part of the SwiftNIO open source project
 //
-// Copyright (c) 2017-2021 Apple Inc. and the SwiftNIO project authors
+// Copyright (c) 2017-2024 Apple Inc. and the SwiftNIO project authors
 // Licensed under Apache License v2.0
 //
 // See LICENSE.txt for license information
@@ -20,6 +20,7 @@ import NIOCore
 import Dispatch
 #endif
 
+@usableFromInline
 struct NIORegistration: Registration {
     enum ChannelType {
         case serverSocketChannel(ServerSocketChannel)
@@ -31,9 +32,11 @@ struct NIORegistration: Registration {
     var channel: ChannelType
 
     /// The `SelectorEventSet` in which this `NIORegistration` is interested in.
+    @usableFromInline
     var interested: SelectorEventSet
 
     /// The registration ID for this `NIORegistration` used by the `Selector`.
+    @usableFromInline
     var registrationID: SelectorRegistrationID
 }
 
@@ -568,6 +571,7 @@ extension ScheduledTask: Comparable {
 }
 
 extension NIODeadline {
+    @inlinable
     func readyIn(_ target: NIODeadline) -> TimeAmount {
         if self < target {
             return .nanoseconds(0)