Vendor things

third-party/vendor/dispatch/examples/main.rs

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+extern crate dispatch;
+
+use std::io;
+use std::process::exit;
+use dispatch::{Queue, QueuePriority};
+
+/// Prompts for a number and adds it to the given sum.
+///
+/// Reading from stdin is done on the given queue.
+/// All printing is performed on the main queue.
+/// Repeats until the user stops entering numbers.
+fn prompt(mut sum: i32, queue: Queue) {
+    queue.clone().exec_async(move || {
+        let main = Queue::main();
+        // Print our prompt on the main thread and wait until it's complete
+        main.exec_sync(|| {
+            println!("Enter a number:");
+        });
+
+        // Read the number the user enters
+        let mut input = String::new();
+        io::stdin().read_line(&mut input).unwrap();
+
+        if let Ok(num) = input.trim().parse::<i32>() {
+            sum += num;
+            // Print the sum on the main thread and wait until it's complete
+            main.exec_sync(|| {
+                println!("Sum is {}\n", sum);
+            });
+            // Do it again!
+            prompt(sum, queue);
+        } else {
+            // Bail if no number was entered
+            main.exec_async(|| {
+                println!("Not a number, exiting.");
+                exit(0);
+            });
+        }
+    });
+}
+
+fn main() {
+    // Read from stdin on a background queue so that the main queue is free
+    // to handle other events. All printing still occurs through the main
+    // queue to avoid jumbled output.
+    prompt(0, Queue::global(QueuePriority::Default));
+
+    unsafe {
+        dispatch::ffi::dispatch_main();
+    }
+}