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https://github.com/apple/swift.git
synced 2026-11-06 00:14:32 +01:00
Gonzalo Larralde
f2a9503771
Add SwiftMutexFlags to the EmbeddedPlatform mutex hook so callers can request checked and recursive mutex behavior without introducing a separate recursive mutex entrypoint. Update the single-threaded EmbeddedPlatform implementation to track recursive lock depth, update the embedded Synchronization mutex hook declaration to match the flags-shaped ABI, and extend the embedded mutex tests to cover recursive checked behavior. Also avoid compiling the continuation-checking LazyMutex state in embedded Concurrency builds, where unchecked-continuation tracking is disabled.
77 lines
2.3 KiB
Swift
77 lines
2.3 KiB
Swift
//===----------- EmbeddedPlatformSingleThreaded.swift ---------------------===//
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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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fileprivate struct SingleThreadedMutex {
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var checked: Bool
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var recursive: Bool
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var lockCount: UInt
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}
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@implementation @c
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public func _swift_mutex_init(
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_ mutex: UnsafeMutableRawPointer,
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_ flags: SwiftMutexFlags
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) {
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let storage = mutex.assumingMemoryBound(to: SingleThreadedMutex.self)
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storage.pointee = SingleThreadedMutex(
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checked: flags.contains(.checked),
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recursive: flags.contains(.recursive),
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lockCount: 0)
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}
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@implementation @c
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public func _swift_mutex_destroy(_ mutex: UnsafeMutableRawPointer) {
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let storage = mutex.assumingMemoryBound(to: SingleThreadedMutex.self)
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if storage.pointee.checked && storage.pointee.lockCount != 0 {
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fatalError("destroying a locked mutex")
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}
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storage.pointee = SingleThreadedMutex(
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checked: false,
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recursive: false,
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lockCount: 0)
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}
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@implementation @c
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public func _swift_mutex_lock(_ mutex: UnsafeMutableRawPointer) {
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let storage = mutex.assumingMemoryBound(to: SingleThreadedMutex.self)
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if storage.pointee.checked {
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if storage.pointee.lockCount != 0 && !storage.pointee.recursive {
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fatalError("locking an already locked mutex")
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}
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storage.pointee.lockCount += 1
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}
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}
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@implementation @c
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public func _swift_mutex_unlock(_ mutex: UnsafeMutableRawPointer) {
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let storage = mutex.assumingMemoryBound(to: SingleThreadedMutex.self)
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if storage.pointee.checked {
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if storage.pointee.lockCount == 0 {
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fatalError("unlocking an unlocked mutex")
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}
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storage.pointee.lockCount -= 1
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}
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}
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@implementation @c
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public func _swift_mutex_tryLock(_ mutex: UnsafeMutableRawPointer) -> Int {
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let storage = mutex.assumingMemoryBound(to: SingleThreadedMutex.self)
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if storage.pointee.checked {
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if storage.pointee.lockCount != 0 && !storage.pointee.recursive {
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return 0
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}
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storage.pointee.lockCount += 1
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}
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return 1
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}
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