Vendor things

third-party/vendor/metal/examples/events/main.rs

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+// Copyright 2020 GFX developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+use dispatch::{Queue, QueueAttribute};
+use metal::*;
+
+/// This example replicates `Synchronizing Events Between a GPU and the CPU` article.
+/// See https://developer.apple.com/documentation/metal/synchronization/synchronizing_events_between_a_gpu_and_the_cpu
+fn main() {
+    let device = Device::system_default().expect("No device found");
+
+    let command_queue = device.new_command_queue();
+    let command_buffer = command_queue.new_command_buffer();
+
+    // Shareable event
+    let shared_event = device.new_shared_event();
+
+    // Shareable event listener
+    let my_queue = Queue::create(
+        "com.example.apple-samplecode.MyQueue",
+        QueueAttribute::Serial,
+    );
+
+    // Enable `dispatch` feature to use dispatch queues,
+    // otherwise unsafe `from_queue_handle` is available for use with native APIs.
+    let shared_event_listener = SharedEventListener::from_queue(&my_queue);
+
+    // Register CPU work
+    let notify_block = block::ConcreteBlock::new(move |evt: &SharedEventRef, val: u64| {
+        println!("Got notification from GPU: {}", val);
+        evt.set_signaled_value(3);
+    });
+
+    shared_event.notify(&shared_event_listener, 2, notify_block.copy());
+
+    // Encode GPU work
+    command_buffer.encode_signal_event(&shared_event, 1);
+    command_buffer.encode_signal_event(&shared_event, 2);
+    command_buffer.encode_wait_for_event(&shared_event, 3);
+
+    command_buffer.commit();
+
+    command_buffer.wait_until_completed();
+
+    println!("Done");
+}