本文整理了Java中sun.misc.Unsafe.copyMemory()方法的一些代码示例，展示了Unsafe.copyMemory()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Unsafe.copyMemory()方法的具体详情如下：
包路径：sun.misc.Unsafe
类名称：Unsafe
方法名：copyMemory

Unsafe.copyMemory介绍

[英]Sets all bytes in a given block of memory to a copy of another block. This provides a single-register addressing mode, as discussed in #getInt(Object,long). Equivalent to copyMemory(null, srcAddress, null, destAddress, bytes).
[中]将给定内存块中的所有字节设置为另一个块的副本。这提供了一种“单寄存器”寻址模式，如#getInt（Object，long）中所述。相当于copyMemory(null, srcAddress, null, destAddress, bytes)。

代码示例

代码示例来源：origin: prestodb/presto

private static void copyMemory(Object src, long srcAddress, Object dest, long destAddress, int length)
{
  // The Unsafe Javadoc specifies that the transfer size is 8 iff length % 8 == 0
  // so ensure that we copy big chunks whenever possible, even at the expense of two separate copy operations
  int bytesToCopy = length - (length % 8);
  unsafe.copyMemory(src, srcAddress, dest, destAddress, bytesToCopy);
  unsafe.copyMemory(src, srcAddress + bytesToCopy, dest, destAddress + bytesToCopy, length - bytesToCopy);
}

代码示例来源：origin: redisson/redisson

@Override
public byte[] toBytes(long startIndex, int len) {
  byte res[] = new byte[len];
  unsafe.copyMemory(null,baseAdress+startIndex, res, FSTUtil.bufoff, len );
  return res;
}

代码示例来源：origin: redisson/redisson

@Override
public void setDouble(long byteIndex, double[] source, int elemoff, int numElems) {
  unsafe.copyMemory(source,daoff+elemoff*8,null, baseAdress +byteIndex,numElems*8);
}

代码示例来源：origin: redisson/redisson

@Override
public void setChar(long byteIndex, char[] source, int elemoff, int numElems) {
  unsafe.copyMemory(source,caoff+elemoff*2, null, baseAdress +byteIndex,numElems*2);
}

代码示例来源：origin: netty/netty

private static void copyMemoryWithSafePointPolling(
    Object src, long srcOffset, Object dst, long dstOffset, long length) {
  while (length > 0) {
    long size = Math.min(length, UNSAFE_COPY_THRESHOLD);
    UNSAFE.copyMemory(src, srcOffset, dst, dstOffset, size);
    length -= size;
    srcOffset += size;
    dstOffset += size;
  }
}

代码示例来源：origin: netty/netty

private static void copyMemoryWithSafePointPolling(long srcAddr, long dstAddr, long length) {
  while (length > 0) {
    long size = Math.min(length, UNSAFE_COPY_THRESHOLD);
    UNSAFE.copyMemory(srcAddr, dstAddr, size);
    length -= size;
    srcAddr += size;
    dstAddr += size;
  }
}

代码示例来源：origin: redisson/redisson

private static void copyMemoryWithSafePointPolling(
    Object src, long srcOffset, Object dst, long dstOffset, long length) {
  while (length > 0) {
    long size = Math.min(length, UNSAFE_COPY_THRESHOLD);
    UNSAFE.copyMemory(src, srcOffset, dst, dstOffset, size);
    length -= size;
    srcOffset += size;
    dstOffset += size;
  }
}

代码示例来源：origin: redisson/redisson

private static void copyMemoryWithSafePointPolling(long srcAddr, long dstAddr, long length) {
  while (length > 0) {
    long size = Math.min(length, UNSAFE_COPY_THRESHOLD);
    UNSAFE.copyMemory(srcAddr, dstAddr, size);
    length -= size;
    srcAddr += size;
    dstAddr += size;
  }
}

代码示例来源：origin: redisson/redisson

@Override
public void setFloat(long byteIndex, float[] source, int elemoff, int numElems) {
  checkIndex(byteIndex,numElems*4);
  unsafe.copyMemory(source,faoff+off-byteoff+elemoff*4,base,off+byteIndex,numElems*4);
}

代码示例来源：origin: redisson/redisson

@Override
public void setDouble(long byteIndex, double[] source, int elemoff, int numElems) {
  checkIndex(byteIndex,numElems*8);
  unsafe.copyMemory(source,daoff+off-byteoff+elemoff*8,base,off+byteIndex,numElems*8);
}

代码示例来源：origin: redisson/redisson

@Override
public void setLong(long byteIndex, long[] source, int elemoff, int numElems) {
  checkIndex(byteIndex,numElems*8);
  unsafe.copyMemory(source,laoff+off-byteoff+elemoff*8,base,off+byteIndex,numElems*8);
}

代码示例来源：origin: redisson/redisson

@Override
public void setInt(long byteIndex, int[] source, int elemoff, int numElems) {
  checkIndex(byteIndex,numElems*4);
  unsafe.copyMemory(source,iaoff+off-byteoff+elemoff*4,base,off+byteIndex,numElems*4);
}

代码示例来源：origin: redisson/redisson

@Override
public void setChar(long byteIndex, char[] source, int elemoff, int numElems) {
  checkIndex(byteIndex,numElems*2);
  unsafe.copyMemory(source,caoff+off-byteoff+elemoff*2,base,off+byteIndex,numElems*2);
}

代码示例来源：origin: redisson/redisson

@Override
public void set(long byteIndex, byte[] source, int elemoff, int numElems) {
  checkIndex(byteIndex,numElems);
  unsafe.copyMemory(source,off+elemoff,base,off+byteIndex,numElems);
}

代码示例来源：origin: redisson/redisson

@Override
public void setShort(long byteIndex, short[] source, int elemoff, int numElems) {
  checkIndex(byteIndex,numElems*2);
  unsafe.copyMemory(source,caoff+off-byteoff+elemoff*2,base,off+byteIndex,numElems*2);
}

代码示例来源：origin: netty/netty

static void copyMemory(Object src, long srcOffset, Object dst, long dstOffset, long length) {
  // Manual safe-point polling is only needed prior Java9:
  // See https://bugs.openjdk.java.net/browse/JDK-8149596
  if (javaVersion() <= 8) {
    copyMemoryWithSafePointPolling(src, srcOffset, dst, dstOffset, length);
  } else {
    UNSAFE.copyMemory(src, srcOffset, dst, dstOffset, length);
  }
}

代码示例来源：origin: netty/netty

static void copyMemory(long srcAddr, long dstAddr, long length) {
  // Manual safe-point polling is only needed prior Java9:
  // See https://bugs.openjdk.java.net/browse/JDK-8149596
  if (javaVersion() <= 8) {
    copyMemoryWithSafePointPolling(srcAddr, dstAddr, length);
  } else {
    UNSAFE.copyMemory(srcAddr, dstAddr, length);
  }
}

代码示例来源：origin: redisson/redisson

static void copyMemory(long srcAddr, long dstAddr, long length) {
  // Manual safe-point polling is only needed prior Java9:
  // See https://bugs.openjdk.java.net/browse/JDK-8149596
  if (javaVersion() <= 8) {
    copyMemoryWithSafePointPolling(srcAddr, dstAddr, length);
  } else {
    UNSAFE.copyMemory(srcAddr, dstAddr, length);
  }
}

代码示例来源：origin: redisson/redisson

static void copyMemory(Object src, long srcOffset, Object dst, long dstOffset, long length) {
  // Manual safe-point polling is only needed prior Java9:
  // See https://bugs.openjdk.java.net/browse/JDK-8149596
  if (javaVersion() <= 8) {
    copyMemoryWithSafePointPolling(src, srcOffset, dst, dstOffset, length);
  } else {
    UNSAFE.copyMemory(src, srcOffset, dst, dstOffset, length);
  }
}

代码示例来源：origin: redisson/redisson

@Override
public void copyTo(BasicBytez other, long otherByteIndex, long myByteIndex, long lenBytes) {
  if ( other instanceof HeapBytez) {
    HeapBytez hp = (HeapBytez) other;
    unsafe.copyMemory(null,baseAdress+myByteIndex, hp.getBase(), hp.getOff()+otherByteIndex,lenBytes);
  } else {
    for ( long i = 0; i < lenBytes; i++ ) {
      other.put(otherByteIndex+i,get(myByteIndex+i));
    }
  }
}