public class SpinLock {

private volatile int lock = 0;

private static Unsafe theUnsafe;

private static long lockOff;

static {

try {

Field theUnsafeField = Unsafe.class.getDeclaredField(“theUnsafe”);

theUnsafeField.setAccessible(true);

theUnsafe = (Unsafe) theUnsafeField.get(null);

Field lockField = SpinLock.class.getDeclaredField(“l(fā)ock”);

lockOff = theUnsafe.objectFieldOffset(lockField);

} catch (Exception e) {

e.printStackTrace();

}

}

public void lock() {

while (! theUnsafe.compareAndSwapInt(this, lockOff, 0, 1)){

}

}

public void unlock() {

theUnsafe.compareAndSwapInt(this, lockOff, 1, 0);

}

}

我也寫(xiě)了個(gè)自旋鎖，

總結(jié)

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