components/metal_util/device_removal.mm

// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "components/metal_util/device_removal.h"

#include "base/process/process.h"

#import <Metal/Metal.h>

namespace metal {

void RegisterGracefulExitOnDeviceRemoval() {
  if (@available(macOS 10.13, *)) {
    id<NSObject> deviceObserver = nil;
    MTLCopyAllDevicesWithObserver(
        &deviceObserver,
        ^(id<MTLDevice> device, MTLDeviceNotificationName name) {
          if (name == MTLDeviceRemovalRequestedNotification ||
              name == MTLDeviceWasRemovedNotification) {
            // Exit the GPU process without error. The browser process sees
            // this error code as a graceful shutdown, so relaunches the GPU
            // process without incrementing the crash count.
            //
            // Note this wouldn't work nicely with in-process-gpu (it would
            // exit the browser), but we don't support that on macOS anyway.
            base::Process::TerminateCurrentProcessImmediately(0);
          }
        });
  }
}

}  // namespace metal