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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,54 @@ | ||
| import Foundation | ||
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| /// A Mutex protects a value with an NSLock. | ||
| /// | ||
| /// We'll replace it with the SE-0433 Mutex when it is available. | ||
| /// <https://github.com/apple/swift-evolution/blob/main/proposals/0433-mutex.md> | ||
| final class Mutex<T> { | ||
| private var _value: T | ||
| private var lock = NSLock() | ||
|
|
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| init(_ value: T) { | ||
| _value = value | ||
| } | ||
|
|
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| /// Runs the provided closure while holding a lock on the value. | ||
| /// | ||
| /// - parameter body: A closure that can modify the value. | ||
| func withLock<U>(_ body: (inout T) throws -> U) rethrows -> U { | ||
| lock.lock() | ||
| defer { lock.unlock() } | ||
| return try body(&_value) | ||
| } | ||
| } | ||
|
|
||
| // Inspired by <https://forums.swift.org/t/se-0433-synchronous-mutual-exclusion-lock/71174/58> | ||
| extension Mutex { | ||
| func load() -> T { | ||
| withLock { $0 } | ||
| } | ||
|
|
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| func store(_ value: T) { | ||
| withLock { $0 = value } | ||
| } | ||
| } | ||
|
|
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| extension Mutex where T: Numeric { | ||
| @discardableResult | ||
| func increment() -> T { | ||
| withLock { n in | ||
| n += 1 | ||
| return n | ||
| } | ||
| } | ||
|
|
||
| @discardableResult | ||
| func decrement() -> T { | ||
| withLock { n in | ||
| n -= 1 | ||
| return n | ||
| } | ||
| } | ||
| } | ||
|
|
||
| extension Mutex: @unchecked Sendable where T: Sendable { } |
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