編集履歴

質問編集履歴

記載ミスの修正

2017/04/14 02:51

投稿

スコア0

test CHANGED Viewed

File without changes

test CHANGED Viewed

@@ -207,61 +207,3 @@
 ###補足情報(言語/FW/ツール等のバージョンなど)
 【swift3】【Xcode8.2.1】
-###セマフォ（デッドロック）
-```Swift
-import UIKit
-import Alamofire
-class ViewController: UIViewController {
-    let semaphore = DispatchSemaphore(value: 0)
-    override func viewDidLoad() {
-        super.viewDidLoad()
-        // Do any additional setup after loading the view, typically from a nib.
-        test()
-    }
-    func test() {
-        Alamofire.request("https://qiita.com/api/v2/items", method: .get).responseString { response in
-            guard let object = response.result.value else { return }
-            print(object)
-            self.semaphore.signal()
-        }
-        print("waiting...")
-        semaphore.wait()
-        print("finish")
-    }
-}
-```

デッドロック

2017/04/14 02:51

投稿

スコア0

test CHANGED Viewed

File without changes

test CHANGED Viewed

@@ -212,13 +212,23 @@
-###GCD？
+###セマフォ（デッドロック）
 ```Swift
+import UIKit
+import Alamofire
 class ViewController: UIViewController {
+    let semaphore = DispatchSemaphore(value: 0)
     override func viewDidLoad() {
@@ -226,57 +236,31 @@
         // Do any additional setup after loading the view, typically from a nib.
-        DispatchQueue(label: "test").async {
-            self.test1()
+        test()
-            DispatchQueue(label: "test").asyncAfter(deadline: .now() + 5) {
-                self.test2()
-                DispatchQueue(label: "test").async {
-                    self.test3()
-                }
+    }
-            }
-        }
-    }
-    func test1() {
+    func test() {
-        print("test1")
-    }
-    func test2() {
-        print("test2-")
-    }
-    func test3() {
-        Alamofire.request("https://qiita.com/api/v2/items", method: .get).responseJSON { response in
+        Alamofire.request("https://qiita.com/api/v2/items", method: .get).responseString { response in
             guard let object = response.result.value else { return }
+            print(object)
-            //この形だと値を返せない？
+            self.semaphore.signal()
-        }
+        }
+        print("waiting...")
+        semaphore.wait()
+        print("finish")
-    }
+    }
 }

GCDサンプル追加？

2017/04/14 02:23

投稿

スコア0

test CHANGED Viewed

File without changes

test CHANGED Viewed

@@ -207,3 +207,77 @@
 ###補足情報(言語/FW/ツール等のバージョンなど)
 【swift3】【Xcode8.2.1】
+###GCD？
+```Swift
+class ViewController: UIViewController {
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        // Do any additional setup after loading the view, typically from a nib.
+        DispatchQueue(label: "test").async {
+            self.test1()
+            DispatchQueue(label: "test").asyncAfter(deadline: .now() + 5) {
+                self.test2()
+                DispatchQueue(label: "test").async {
+                    self.test3()
+                }
+            }
+        }
+    }
+    func test1() {
+        print("test1")
+    }
+    func test2() {
+        print("test2-")
+    }
+    func test3() {
+        Alamofire.request("https://qiita.com/api/v2/items", method: .get).responseJSON { response in
+            guard let object = response.result.value else { return }
+            //この形だと値を返せない？
+        }
+    }
+}
+```