// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Package arch defines architecture-specific information and support functions.
package arch

import (
	"cmd/internal/obj"
	"cmd/internal/obj/arm"
	"cmd/internal/obj/arm64"
	"cmd/internal/obj/loong64"
	"cmd/internal/obj/mips"
	"cmd/internal/obj/ppc64"
	"cmd/internal/obj/riscv"

  }

  /**
   * A function from an input to a result.
   *
   * @param <T> the type of the input to the function
   * @param <U> the type of the result of the function
   */
  public interface ClosingFunction<T extends @Nullable Object, U extends @Nullable Object> {

    /**
     * Applies this function to an input, or throws an exception if unable to do so.
     *

//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

// Package cmd This file implements helper functions to validate Streaming AWS
// Signature Version '4' authorization header.
package cmd

import (
	"bufio"
	"bytes"
	"encoding/hex"
	"errors"
	"fmt"
	"hash"
	"io"
	"net/http"
	"strings"

이 부분은 아마 건너뛰어도 됩니다.

이것들은 **FastAPI**가 내부적으로 어떻게 동작하는지에 대한 매우 세부적인 기술사항입니다.

(코루틴, 스레드, 블로킹 등) 같은 기술 지식이 꽤 있고 FastAPI가 `async def`와 일반 `def`를 어떻게 처리하는지 궁금하다면, 계속 읽어보세요.

///

### 경로 처리 함수 { #path-operation-functions }

*경로 처리 함수*를 `async def` 대신 일반적인 `def`로 선언하면, (서버를 블로킹할 수 있으므로 직접 호출하는 대신) 외부 스레드풀에서 실행되고 그 결과를 await 합니다.

// If file names are equal, compareMeta is called to select which one to choose.
// The entry not chosen will be discarded.
// If the context is canceled the function will return the error,
// otherwise the function will return nil.
func mergeEntryChannels(ctx context.Context, in []chan metaCacheEntry, out chan<- metaCacheEntry, readQuorum int) error {
	defer xioutil.SafeClose(out)

    Predicate<String> trimEqualsFoo = Predicates.compose(equalsFoo, trim);
    Function<String, String> identity = Functions.identity();

    assertTrue(trimEqualsFoo.apply("Foo"));
    assertTrue(trimEqualsFoo.apply("   Foo   "));
    assertFalse(trimEqualsFoo.apply("Foo-b-que"));

    new EqualsTester()
        .addEqualityGroup(trimEqualsFoo, Predicates.compose(equalsFoo, trim))

    ListenableFuture<@Nullable FooChild> future = immediateFuture(null);
    BarChild barChild = new BarChild();
    Function<Foo, BarChild> function = unused -> barChild;
    Bar bar = getDone(transform(future, function, directExecutor()));
    assertThat(bar).isEqualTo(barChild);
  }

  @J2ktIncompatible
  @GwtIncompatible // StackOverflowError

    ListenableFuture<@Nullable FooChild> future = immediateFuture(null);
    BarChild barChild = new BarChild();
    Function<Foo, BarChild> function = unused -> barChild;
    Bar bar = getDone(transform(future, function, directExecutor()));
    assertThat(bar).isEqualTo(barChild);
  }

  @J2ktIncompatible
  @GwtIncompatible // StackOverflowError

import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.Collection;
import java.util.Comparator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.function.Function;
import java.util.stream.Collector;
import java.util.stream.Stream;
import org.jspecify.annotations.Nullable;

/**
 * A {@link SetMultimap} whose contents will never change, with many other important properties

   * Collectors#toMap(Function, Function)}, which throws an {@code IllegalStateException}.)
   *
   * @since 21.0
   */
  public static <T extends @Nullable Object, K, V>
      Collector<T, ?, ImmutableBiMap<K, V>> toImmutableBiMap(
          Function<? super T, ? extends K> keyFunction,
          Function<? super T, ? extends V> valueFunction) {