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8316337: (bf) Concurrency issue in DirectByteBuffer.Deallocator

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Reviewed-by: alanb, liach
This commit is contained in:
Per Minborg 2023-09-19 13:10:51 +00:00
parent 4461eeb31d
commit cf74b8c2a3
3 changed files with 31 additions and 45 deletions
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11
src/java.base/share/classes/sun/nio/ch/FileChannelImpl.java
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@ -1154,10 +1154,10 @@ public class FileChannelImpl
// -- Memory-mapped buffers --
private abstract static class Unmapper
private sealed abstract static class Unmapper
implements Runnable, UnmapperProxy
{
private volatile long address;
private final long address;
protected final long size;
protected final long cap;
private final FileDescriptor fd;
@ -1194,10 +1194,7 @@ public class FileChannelImpl
}
public void unmap() {
if (address == 0)
return;
nd.unmap(address, size);
address = 0;
// if this mapping has a valid file descriptor then we close it
if (fd.valid()) {
@ -1214,7 +1211,7 @@ public class FileChannelImpl
protected abstract void decrementStats();
}
private static class DefaultUnmapper extends Unmapper {
private static final class DefaultUnmapper extends Unmapper {
// keep track of non-sync mapped buffer usage
static volatile int count;
@ -1247,7 +1244,7 @@ public class FileChannelImpl
}
}
private static class SyncUnmapper extends Unmapper {
private static final class SyncUnmapper extends Unmapper {
// keep track of mapped buffer usage
static volatile int count;