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66b9d21000
Read/write locks are not as good as you'd think; a simple mutex is better in almost all cases. rdar://90776105
42 lines
1.3 KiB
C++
42 lines
1.3 KiB
C++
//===--- MutexSingleThreaded.h - --------------------------------*- 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) 2014 - 2020 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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//
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// No-op implementation of locks for single-threaded environments.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_RUNTIME_MUTEX_SINGLE_THREADED_H
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#define SWIFT_RUNTIME_MUTEX_SINGLE_THREADED_H
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#include "swift/Runtime/Debug.h"
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namespace swift {
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typedef void* MutexHandle;
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#define SWIFT_MUTEX_SUPPORTS_CONSTEXPR 1
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struct MutexPlatformHelper {
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static constexpr MutexHandle staticInit() { return nullptr; }
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static void init(MutexHandle &mutex, bool checked = false) {}
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static void destroy(MutexHandle &mutex) {}
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static void lock(MutexHandle &mutex) {}
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static void unlock(MutexHandle &mutex) {}
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static bool try_lock(MutexHandle &mutex) { return true; }
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static void unsafeLock(MutexHandle &mutex) {}
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static void unsafeUnlock(MutexHandle &mutex) {}
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};
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}
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#endif
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