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Swift's dynamic exclusivity checking relies on two functions, _swift_getExclusivityTLS and _swift_setExclusivityTLS, to properly deal with multi-threaded contexts. In the non-Embedded standard library, these are provided by the Swift runtime. For Embedded Swift, we cannot rely on having thread-local storage. Instead, require the platform to provide these two entrypoints. To make things simpler, we offer two implementations one can link in: - libswiftExclusivitySingleThreaded.a: single-threaded implementation - libswiftExclusivityC11ThreadLocal.a: multi-threaded implementation that uses C11 thread-locals Embedded Swift programs using dynamic exclusivity can link in one of these libraries, or can implement its own versions of these two functions. A platform can choose to provide them if it has different mechanisms for thread-local storage. This makes dynamic exclusivity checking generally usable in Embedded Swift, rdar://159115910.
32 lines
1.1 KiB
C++
32 lines
1.1 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2026 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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// Single-threaded implementation of dynamic exclusivity checking. This file
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// should be linked in to single-threaded Embedded Swift applications that
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// require dynamic exclusivity checking.
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//===----------------------------------------------------------------------===//
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#include "swift/shims/Visibility.h"
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extern "C" {
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void * _Nullable _swift_exclusivity_single_threaded;
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SWIFT_RUNTIME_STDLIB_INTERNAL
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void * _Nullable _swift_getExclusivityTLS() {
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return _swift_exclusivity_single_threaded;
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}
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SWIFT_RUNTIME_STDLIB_INTERNAL
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void _swift_setExclusivityTLS(void * _Nullable newValue) {
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_swift_exclusivity_single_threaded = newValue;
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}
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}
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