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8317514: Ensure MemorySegment is initialized before touching NativeMemorySegmentImpl

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Co-authored-by: Jorn Vernee <jvernee@openjdk.org>
Reviewed-by: jvernee
This commit is contained in:
Maurizio Cimadamore 2023-10-13 20:51:52 +00:00
parent 9622de2aa8
commit 7cb2e6d65b
12 changed files with 338 additions and 183 deletions
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20
src/java.base/share/classes/sun/nio/ch/FileChannelImpl.java
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@ -50,9 +50,8 @@ import java.util.Objects;
import jdk.internal.access.JavaIOFileDescriptorAccess;
import jdk.internal.access.SharedSecrets;
import jdk.internal.foreign.AbstractMemorySegmentImpl;
import jdk.internal.foreign.MappedMemorySegmentImpl;
import jdk.internal.foreign.MemorySessionImpl;
import jdk.internal.foreign.SegmentFactories;
import jdk.internal.misc.Blocker;
import jdk.internal.misc.ExtendedMapMode;
import jdk.internal.misc.Unsafe;
@ -1335,22 +1334,7 @@ public class FileChannelImpl
if (mode == MapMode.READ_ONLY) {
readOnly = true;
}
if (unmapper != null) {
AbstractMemorySegmentImpl segment =
new MappedMemorySegmentImpl(unmapper.address(), unmapper, size,
readOnly, sessionImpl);
MemorySessionImpl.ResourceList.ResourceCleanup resource =
new MemorySessionImpl.ResourceList.ResourceCleanup() {
@Override
public void cleanup() {
unmapper.unmap();
}
};
sessionImpl.addOrCleanupIfFail(resource);
return segment;
} else {
return new MappedMemorySegmentImpl(0, null, 0, readOnly, sessionImpl);
}
return SegmentFactories.mapSegment(size, unmapper, readOnly, sessionImpl);
}
private Unmapper mapInternal(MapMode mode, long position, long size, int prot, boolean isSync)