twice.
</p>

<h3 id="atomic">Atomic Values</h3>

<p>
The APIs in the <a href="/pkg/sync/atomic/"><code>sync/atomic</code></a>
package are collectively “atomic operations”
that can be used to synchronize the execution of different goroutines.
If the effect of an atomic operation <i>A</i> is observed by atomic operation <i>B</i>,
then <i>A</i> is synchronized before <i>B</i>.

	for range numIterations {
		if rwm.GetRLock(context.Background(), nil, id, source, Options{Timeout: time.Second}) {
			n := atomic.AddInt32(activity, 1)
			if n < 1 || n >= 10000 {
				panic(fmt.Sprintf("wlock(%d)\n", n))
			}
			for range 100 {
			}
			atomic.AddInt32(activity, -1)
			rwm.RUnlock(context.Background())
		}
	}
	cdone <- true
}

// Borrowed from rwmutex_test.go

import java.io.Serializable;
import java.util.Collections;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicLong;
import java.util.function.LongBinaryOperator;
import java.util.function.LongUnaryOperator;
import org.jspecify.annotations.Nullable;

/**

// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package grid

import (
	"context"
	"errors"
	"fmt"
	"sync"
	"sync/atomic"
	"time"

	xioutil "github.com/minio/minio/internal/ioutil"
)

type muxServer struct {
	ID                 uint64
	LastPing           int64
	SendSeq, RecvSeq   uint32
	Resp               chan []byte

func (r *countUpReader) Read(p []byte) (n int, err error) {
	n, err = r.reader.Read(p)
	atomic.AddInt64(&r.bytesRead, int64(n))
	return n, err
}

func (r *countUpReader) BytesRead() int64 {
	if r == nil {
		return 0
	}
	return atomic.LoadInt64(&r.bytesRead)
}

func newCountUpReader(reader io.Reader) *countUpReader {
	return &countUpReader{
		reader: reader,
	}
}

type localLocker struct {
	mutex     sync.Mutex
	waitMutex atomic.Int32
	lockMap   map[string][]lockRequesterInfo
	lockUID   map[string]string // UUID -> resource map.

	// the following are updated on every cleanup defined in lockValidityDuration
	readers         atomic.Int32
	writers         atomic.Int32
	lastCleanup     atomic.Pointer[time.Time]
	locksOverloaded atomic.Int64
}

// getMutex will lock the mutex.

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.net.URLClassLoader;
import java.util.Set;
import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
import junit.framework.TestCase;
import junit.framework.TestSuite;
import org.jspecify.annotations.NullUnmarked;

/**

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package jcifs.util;

import java.util.concurrent.Callable;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.AtomicReference;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Simplified circuit breaker implementation for SMB operations.

	ttl time.Duration

	opts Opts

	// Once can be used to initialize values for lazy initialization.
	// Should be set before calling Get().
	Once sync.Once

	// Managed values.
	val          atomic.Pointer[T]
	lastUpdateMs atomic.Int64
	updating     sync.Mutex
}

// New allocates a new cached value instance. Tt must be initialized with
// `.TnitOnce`.
func New[T any]() *Cache[T] {
	return &Cache[T]{}
}

		atomic.AddUint64(&p.stats.mrfStats.TotalDroppedCount, 1)
		atomic.AddUint64(&p.stats.mrfStats.TotalDroppedBytes, uint64(entry.sz))
		return
	}

	select {
	case <-GlobalContext.Done():
		return
	case <-p.mrfStopCh:
		return
	default:
		select {
		case p.mrfSaveCh <- entry:
		default:
			atomic.AddUint64(&p.stats.mrfStats.TotalDroppedCount, 1)