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8064407: (fc) FileChannel transferTo should use TransmitFile on Windows

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Co-authored-by: Valeriy Kopylov <v-valkop@microsoft.com>
Reviewed-by: alanb
This commit is contained in:
Kirk Shoop 2014-12-07 07:10:29 +00:00 • committed by Alan Bateman
parent c278cc80e9
commit 9eafb6c406
7 changed files with 160 additions and 41 deletions
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46
jdk/src/java.base/windows/classes/sun/nio/ch/FileDispatcherImpl.java
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@ -25,21 +25,21 @@
package sun.nio.ch;
import java.io.*;
import java.io.FileDescriptor;
import java.io.IOException;
import java.security.PrivilegedAction;
import sun.misc.SharedSecrets;
import sun.misc.JavaIOFileDescriptorAccess;
class FileDispatcherImpl extends FileDispatcher
{
class FileDispatcherImpl extends FileDispatcher {
private static final JavaIOFileDescriptorAccess fdAccess =
SharedSecrets.getJavaIOFileDescriptorAccess();
static {
IOUtil.load();
}
// set to true if fast file transmission (TransmitFile) is enabled
private static final boolean fastFileTransfer;
FileDispatcherImpl() {
}
FileDispatcherImpl() { }
@Override
boolean needsPositionLock() {
@ -110,6 +110,36 @@ class FileDispatcherImpl extends FileDispatcher
return result;
}
boolean canTransferToDirectly(java.nio.channels.SelectableChannel sc) {
return fastFileTransfer && sc.isBlocking();
}
boolean transferToDirectlyNeedsPositionLock() {
return true;
}
static boolean isFastFileTransferRequested() {
String fileTransferProp = java.security.AccessController.doPrivileged(
new PrivilegedAction<String>() {
@Override
public String run() {
return System.getProperty("jdk.net.enableFastFileTransfer");
}
});
boolean enable;
if ("".equals(fileTransferProp)) {
enable = true;
} else {
enable = Boolean.parseBoolean(fileTransferProp);
}
return enable;
}
static {
IOUtil.load();
fastFileTransfer = isFastFileTransferRequested();
}
//-- Native methods
static native int read0(FileDescriptor fd, long address, int len)