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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| //===----------------------------------------------------------------------===// | ||
| // | ||
| // This source file is part of the SwiftNIO open source project | ||
| // | ||
| // Copyright (c) 2023 Apple Inc. and the SwiftNIO project authors | ||
| // Licensed under Apache License v2.0 | ||
| // | ||
| // See LICENSE.txt for license information | ||
| // See CONTRIBUTORS.txt for the list of SwiftNIO project authors | ||
| // | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
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| #if canImport(Darwin) | ||
| import Darwin | ||
| #elseif os(Windows) | ||
| import ucrt | ||
| import WinSDK | ||
| #elseif canImport(Glibc) | ||
| import Glibc | ||
| #elseif canImport(Musl) | ||
| import Musl | ||
| #else | ||
| #error("Unsupported C library") | ||
| #endif | ||
| import NIOCore | ||
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| /// Singleton resources provided by SwiftNIO for programs & libraries that don't need full control over all operating system resources. | ||
| /// | ||
| /// SwiftNIO allows and encourages the precise management of all operating system resources such as threads and file descriptors. | ||
| /// Certain resources (such as the main ``EventLoopGroup``) however are usually globally shared across the program. This means | ||
| /// that many programs have to carry around an ``EventLoopGroup`` despite the fact the don't require the ability to fully return | ||
| /// all the operating resources which would imply shutting down the ``EventLoopGroup``. This type is the global handle for singleton | ||
| /// resources that applications (and some libraries) can use to obtain never-shut-down singleton resources. | ||
| /// | ||
| /// Programs and libraries that do not use these singletons will not incur extra resource usage, these resources are lazily initialized on | ||
| /// first use. | ||
| public enum NIOSingletons {} | ||
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| extension NIOSingletons { | ||
| /// How many threads will be used for the multi-threaded ``EventLoopGroup``s. | ||
| /// | ||
| /// The thread count is ``System/coreCount`` unless the environment variable `NIO_SINGLETONS_MULTI_THREADED_ELG_LOOP_COUNT` | ||
| /// is set. | ||
| public static var suggestedMultiThreadedEventLoopGroupLoopCount: Int { | ||
| return globalSuggestedMultiThreadedEventLoopGroupLoopCount | ||
| } | ||
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| /// How many threads will be used for the blocking `NIOThreadPool`s. | ||
| /// | ||
| /// The thread count is determined automatically unless the environment variable `NIO_SINGLETONS_BLOCKING_POOL_THREAD_COUNT` is set. | ||
| public static var suggestedBlockingPoolThreadCount: Int { | ||
| return globalSuggestedBlockingPoolThreadCount | ||
| } | ||
| } | ||
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| private let globalSuggestedMultiThreadedEventLoopGroupLoopCount: Int = { | ||
| if let threadCountEnv = getenv("NIO_SINGLETONS_MULTI_THREADED_ELG_LOOP_COUNT"), | ||
| let threadCount = Int(String(cString: threadCountEnv)), threadCount > 0 { | ||
| return threadCount | ||
| } else { | ||
| return System.coreCount | ||
| } | ||
| }() | ||
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| private let globalSuggestedBlockingPoolThreadCount: Int = { | ||
| if let threadCountEnv = getenv("NIO_SINGLETONS_BLOCKING_POOL_THREAD_COUNT"), | ||
| let threadCount = Int(String(cString: threadCountEnv)), threadCount > 0 { | ||
| return threadCount | ||
| } else { | ||
| return System.coreCount * 2 | ||
| } | ||
| }() | ||
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|
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,66 @@ | ||
| //===----------------------------------------------------------------------===// | ||
| // | ||
| // This source file is part of the SwiftNIO open source project | ||
| // | ||
| // Copyright (c) 2023 Apple Inc. and the SwiftNIO project authors | ||
| // Licensed under Apache License v2.0 | ||
| // | ||
| // See LICENSE.txt for license information | ||
| // See CONTRIBUTORS.txt for the list of SwiftNIO project authors | ||
| // | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
|
|
||
| @_exported import NIOSingletonResources | ||
| import NIOPosix | ||
| import NIOCore | ||
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| extension NIOSingletons { | ||
| /// A globally shared, lazily initialized ``MultiThreadedEventLoopGroup`` that uses `epoll` as the selector mechanism. | ||
| /// | ||
| /// The number of threads is determined by ``NIOSingletons.suggestedMultiThreadedEventLoopGroupThreadCount``. | ||
| public static var multiThreadedPosixEventLoopGroup: MultiThreadedEventLoopGroup { | ||
| return globalMultiThreadedPosixEventLoopGroup | ||
| } | ||
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| /// A globally shared, lazily initialized ``MultiThreadedEventLoopGroup`` with just one thread that uses `epoll` as the selector mechanism. | ||
| public static var singleThreadedPosixEventLoopGroup: MultiThreadedEventLoopGroup { | ||
| return globalSingleThreadedPosixEventLoopGroup | ||
| } | ||
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| /// A globally shared, lazily initialized ``EventLoop`` that uses `epoll` as the selector mechanism. Backed by `NIOSingletons.singleThreadedPosixEventLoopGroup`. | ||
| public static var posixEventLoop: EventLoop { | ||
| return Self.singleThreadedPosixEventLoopGroup.next() | ||
| } | ||
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| /// A globally shared, lazily initialized ``NIOThreadPool`` that can be used for blocking I/O and other blocking operations. | ||
| /// | ||
| /// /// The number of threads is determined by ``NIOSingletons.suggestedBlockingPoolThreadCount``. | ||
| public static var posixBlockingPool: NIOThreadPool { | ||
| return globalPosixBlockingPool | ||
| } | ||
| } | ||
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| private let globalMultiThreadedPosixEventLoopGroup: MultiThreadedEventLoopGroup = { | ||
| let threadCount = NIOSingletons.suggestedMultiThreadedEventLoopGroupLoopCount | ||
| let group = MultiThreadedEventLoopGroup._makePerpetualGroup(threadNamePrefix: "NIO-MSGTN-", | ||
| numberOfThreads: threadCount) | ||
| _ = Unmanaged.passUnretained(group).retain() // Never gonna give you up, | ||
| return group | ||
| }() | ||
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| private let globalSingleThreadedPosixEventLoopGroup: MultiThreadedEventLoopGroup = { | ||
| let group = MultiThreadedEventLoopGroup._makePerpetualGroup(threadNamePrefix: "NIO-SSGTN-", | ||
| numberOfThreads: 1) | ||
| _ = Unmanaged.passUnretained(group).retain() // never gonna let you down. | ||
| return group | ||
| }() | ||
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| private let globalPosixBlockingPool: NIOThreadPool = { | ||
| let pool = NIOThreadPool._makePerpetualStartedPool(numberOfThreads: NIOSingletons.suggestedBlockingPoolThreadCount) | ||
| _ = Unmanaged.passUnretained(pool).retain() // Make sure this is never deallocated (not strictly necessary). | ||
| return pool | ||
| }() | ||
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