// name is
  // 'main'. Work around this by creating a 'main' source set that forwards to 'jvmMain'.
  //
  // The forwarding SourceSet also needs to fake out some task names to prevent them from
  // being
  // registered twice.
  //
  // https://github.com/bndtools/bnd/issues/6590
  val mainSourceSet = BndBuildAction.installWorkaround(project)

{* ../../docs_src/background_tasks/tutorial001_py310.py hl[1,13] *}

**FastAPI** は、`BackgroundTasks` 型のオブジェクトを作成し、そのパラメーターに渡します。

## タスク関数の作成 { #create-a-task-function }

バックグラウンドタスクとして実行される関数を作成します。

これは、パラメーターを受け取ることができる単なる標準的な関数です。

これは `async def` または通常の `def` 関数であり、**FastAPI** はこれを正しく処理します。

ここで、タスク関数はファイル書き込みを実行します (メール送信のシミュレーション)。

HSPLokhttp3/internal/concurrent/TaskQueue;->schedule$default(Lokhttp3/internal/concurrent/TaskQueue;Lokhttp3/internal/concurrent/Task;JI)V
HSPLokhttp3/internal/concurrent/TaskQueue;->schedule(Lokhttp3/internal/concurrent/Task;J)V
HSPLokhttp3/internal/concurrent/TaskQueue;->scheduleAndDecide$okhttp(Lokhttp3/internal/concurrent/Task;JZ)Z
HSPLokhttp3/internal/concurrent/TaskQueue;->shutdown()V

## [Calls](https://square.github.io/okhttp/5.x/okhttp/okhttp3/-call/)

          }
        });
  }

  private long doMultithreadedLoop(Callable<Long> task)
      throws InterruptedException, ExecutionException {

    List<Future<Long>> futures = Lists.newArrayListWithCapacity(threads);
    for (int i = 0; i < threads; i++) {
      futures.add(threadPool.submit(task));
    }
    long total = 0;
    for (Future<Long> future : futures) {
      total += future.get();

import java.util.concurrent.TimeUnit
import okhttp3.Address
import okhttp3.ConnectionPool
import okhttp3.Route
import okhttp3.internal.closeQuietly
import okhttp3.internal.concurrent.Task
import okhttp3.internal.concurrent.TaskQueue
import okhttp3.internal.concurrent.TaskRunner
import okhttp3.internal.concurrent.assertLockHeld
import okhttp3.internal.concurrent.withLock

        } catch (IOException e) {
            throw new IllegalStateException("unable to read the file " + file + " attributes", e);
        }
    }

    /**
     * Returns the files this task will check
     */
    @InputFiles
    @SkipWhenEmpty
    public FileCollection getFiles() {
        return getSources().get()
            .stream()
            .map(sourceTree -> sourceTree.matching(filesFilter))

    text(
        "profiler",
        defaultProfiler,
        display = ParameterDisplay.PROMPT,
        allowEmpty = false,
        description =
            "Command line option for the performance test task to enable profiling. " +
                "For example `async-profiler`, `async-profiler-heap`, `async-profiler-wall`, `async-profiler-all` or `jfr`. Use `none` for benchmarking only.",
    )
}

        if (availability.path == null) {
            final String message = String.format(
                Locale.ROOT,
                "Docker (checked [%s]) is required to run the following task%s: \n%s",
                String.join(", ", DOCKER_BINARIES),
                tasks.size() > 1 ? "s" : "",
                String.join("\n", tasks)
            );
            throwDockerRequiredException(message);

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;

import static org.apache.commons.io.FileUtils.readFileToString;

/**
 * A task to create a notice file which includes dependencies' notices.
 */
public class NoticeTask extends DefaultTask {

    @InputFile
    private File inputFile = getProject().getRootProject().file("NOTICE.txt");
    @OutputFile