Update dependencies
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26
vendor/github.com/cockroachdb/pebble/internal/manifest/btree.go
generated
vendored
26
vendor/github.com/cockroachdb/pebble/internal/manifest/btree.go
generated
vendored
@@ -108,7 +108,7 @@ type annotation struct {
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}
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type leafNode struct {
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ref int32
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ref atomic.Int32
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count int16
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leaf bool
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// subtreeCount holds the count of files in the entire subtree formed by
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@@ -139,13 +139,13 @@ func leafToNode(ln *leafNode) *node {
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func newLeafNode() *node {
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n := leafToNode(new(leafNode))
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n.leaf = true
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n.ref = 1
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n.ref.Store(1)
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return n
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}
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func newNode() *node {
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n := new(node)
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n.ref = 1
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n.ref.Store(1)
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return n
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}
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@@ -159,7 +159,7 @@ func newNode() *node {
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// When a node is cloned, the provided pointer will be redirected to the new
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// mutable node.
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func mut(n **node) *node {
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if atomic.LoadInt32(&(*n).ref) == 1 {
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if (*n).ref.Load() == 1 {
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// Exclusive ownership. Can mutate in place.
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// Whenever a node will be mutated, reset its annotations to be marked
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@@ -186,7 +186,7 @@ func mut(n **node) *node {
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// incRef acquires a reference to the node.
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func (n *node) incRef() {
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atomic.AddInt32(&n.ref, 1)
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n.ref.Add(1)
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}
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// decRef releases a reference to the node. If requested, the method will unref
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@@ -195,8 +195,8 @@ func (n *node) incRef() {
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// new nodes pass contentsToo=false to preserve existing reference counts during
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// operations that should yield a net-zero change to descendant refcounts.
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// When a node is released, its contained files are dereferenced.
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func (n *node) decRef(contentsToo bool, obsolete *[]*FileMetadata) {
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if atomic.AddInt32(&n.ref, -1) > 0 {
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func (n *node) decRef(contentsToo bool, obsolete *[]*FileBacking) {
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if n.ref.Add(-1) > 0 {
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// Other references remain. Can't free.
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return
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}
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@@ -215,7 +215,13 @@ func (n *node) decRef(contentsToo bool, obsolete *[]*FileMetadata) {
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if obsolete == nil {
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panic(fmt.Sprintf("file metadata %s dereferenced to zero during tree mutation", f.FileNum))
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}
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*obsolete = append(*obsolete, f)
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// Reference counting is performed on the FileBacking. In the case
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// of a virtual sstable, this reference counting is performed on
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// a FileBacking which is shared by every single virtual sstable
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// with the same backing sstable. If the reference count hits 0,
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// then we know that the FileBacking won't be required by any
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// sstable in Pebble, and that the backing sstable can be deleted.
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*obsolete = append(*obsolete, f.FileBacking)
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}
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}
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if !n.leaf {
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@@ -761,8 +767,8 @@ type btree struct {
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// Release dereferences and clears the root node of the btree, removing all
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// items from the btree. In doing so, it decrements contained file counts.
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// It returns a slice of newly obsolete files, if any.
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func (t *btree) Release() (obsolete []*FileMetadata) {
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// It returns a slice of newly obsolete backing files, if any.
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func (t *btree) Release() (obsolete []*FileBacking) {
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if t.root != nil {
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t.root.decRef(true /* contentsToo */, &obsolete)
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t.root = nil
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