From db942def27804790b595bc786d9d9e8e6af52a93 Mon Sep 17 00:00:00 2001
From: 3405691582 <dsk@google.com>
Date: Wed, 16 Apr 2025 22:20:16 -0400
Subject: [PATCH] Add a platform executor module for OpenBSD.

This is basically the same as the one for Linux, but it would be
somewhat awkward to add the platform conditional on a file named for
Linux when OpenBSD is not Linux.

Important note: if Dispatch is disabled, then this will cause a
compilation error (probably not just for OpenBSD either), because
PlatformExecutorFactory is both defined in PlatformExecutorNone.swift
and PlatformExecutor<...>.swift in this case.

Because this only bites OpenBSD bootstrap builds, and since OpenBSD
support has been upstreamed to Dispatch, default to the Dispatch
implementation for now to get this in, and we'll refactor in a different
pr.
---
 Runtimes/Core/Concurrency/CMakeLists.txt      |  1 +
 stdlib/public/Concurrency/CMakeLists.txt      |  1 +
 .../Concurrency/PlatformExecutorOpenBSD.swift | 25 +++++++++++++++++++
 3 files changed, 27 insertions(+)
 create mode 100644 stdlib/public/Concurrency/PlatformExecutorOpenBSD.swift

diff --git a/Runtimes/Core/Concurrency/CMakeLists.txt b/Runtimes/Core/Concurrency/CMakeLists.txt
index 4af3a52b0f80e..f9ba6e9c46967 100644
--- a/Runtimes/Core/Concurrency/CMakeLists.txt
+++ b/Runtimes/Core/Concurrency/CMakeLists.txt
@@ -81,6 +81,7 @@ add_library(swift_Concurrency
   PartialAsyncTask.swift
   PlatformExecutorDarwin.swift
   PlatformExecutorLinux.swift
+  PlatformExecutorOpenBSD.swift
   PlatformExecutorWindows.swift
   PriorityQueue.swift
   SourceCompatibilityShims.swift
diff --git a/stdlib/public/Concurrency/CMakeLists.txt b/stdlib/public/Concurrency/CMakeLists.txt
index 5b2b022930bf9..7202885a50b0b 100644
--- a/stdlib/public/Concurrency/CMakeLists.txt
+++ b/stdlib/public/Concurrency/CMakeLists.txt
@@ -164,6 +164,7 @@ set(SWIFT_RUNTIME_CONCURRENCY_SWIFT_SOURCES
   PlatformExecutorDarwin.swift
   PlatformExecutorLinux.swift
   PlatformExecutorWindows.swift
+  PlatformExecutorOpenBSD.swift
 )
 
 set(SWIFT_RUNTIME_CONCURRENCY_NONEMBEDDED_C_SOURCES
diff --git a/stdlib/public/Concurrency/PlatformExecutorOpenBSD.swift b/stdlib/public/Concurrency/PlatformExecutorOpenBSD.swift
new file mode 100644
index 0000000000000..4bd2db9d5ebdc
--- /dev/null
+++ b/stdlib/public/Concurrency/PlatformExecutorOpenBSD.swift
@@ -0,0 +1,25 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2020 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
+#if !$Embedded && os(OpenBSD)
+
+import Swift
+
+// The default executors for now are Dispatch-based
+@available(SwiftStdlib 6.2, *)
+public struct PlatformExecutorFactory: ExecutorFactory {
+  public static let mainExecutor: any MainExecutor = DispatchMainExecutor()
+  public static let defaultExecutor: any TaskExecutor
+    = DispatchGlobalTaskExecutor()
+}
+
+#endif