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Pods/RxSwift/Platform/AtomicInt.swift

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+//
+//  AtomicInt.swift
+//  Platform
+//
+//  Created by Krunoslav Zaher on 10/28/18.
+//  Copyright © 2018 Krunoslav Zaher. All rights reserved.
+//
+
+import Foundation
+
+final class AtomicInt: NSLock {
+    fileprivate var value: Int32
+    public init(_ value: Int32 = 0) {
+        self.value = value
+    }
+}
+
+@discardableResult
+@inline(__always)
+func add(_ this: AtomicInt, _ value: Int32) -> Int32 {
+    this.lock()
+    let oldValue = this.value
+    this.value += value
+    this.unlock()
+    return oldValue
+}
+
+@discardableResult
+@inline(__always)
+func sub(_ this: AtomicInt, _ value: Int32) -> Int32 {
+    this.lock()
+    let oldValue = this.value
+    this.value -= value
+    this.unlock()
+    return oldValue
+}
+
+@discardableResult
+@inline(__always)
+func fetchOr(_ this: AtomicInt, _ mask: Int32) -> Int32 {
+    this.lock()
+    let oldValue = this.value
+    this.value |= mask
+    this.unlock()
+    return oldValue
+}
+
+@inline(__always)
+func load(_ this: AtomicInt) -> Int32 {
+    this.lock()
+    let oldValue = this.value
+    this.unlock()
+    return oldValue
+}
+
+@discardableResult
+@inline(__always)
+func increment(_ this: AtomicInt) -> Int32 {
+    add(this, 1)
+}
+
+@discardableResult
+@inline(__always)
+func decrement(_ this: AtomicInt) -> Int32 {
+    sub(this, 1)
+}
+
+@inline(__always)
+func isFlagSet(_ this: AtomicInt, _ mask: Int32) -> Bool {
+    (load(this) & mask) != 0
+}