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Snapshot function.

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This commit is contained in:
JoelKatz
2012-05-23 15:18:17 -07:00
parent 33e9fbda04
commit fecf3aaac9
2 changed files with 16 additions and 1 deletions
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14
src/SHAMap.cpp
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@@ -17,6 +17,18 @@ SHAMap::SHAMap(uint32 seq) : mSeq(seq), mState(Modifying)
mTNByID[*root] = root;
}
SHAMap::pointer SHAMap::snapShot()
{ // Return a new SHAMap that is a snapshot of this one
// Initially nodes are shared, but CoW is forced on both ledgers
SHAMap::pointer ret = boost::make_shared<SHAMap>();
SHAMap& newMap = *ret;
newMap.mSeq = ++mSeq;
newMap.mTNByID = mTNByID;
newMap.root = root;
newMap.mState = Immutable;
return ret;
}
std::stack<SHAMapTreeNode::pointer> SHAMap::getStack(const uint256& id, bool include_nonmatching_leaf)
{
// Walk the tree as far as possible to the specified identifier
@@ -142,7 +154,7 @@ void SHAMap::returnNode(SHAMapTreeNode::pointer& node, bool modify)
{ // make sure the node is suitable for the intended operation (copy on write)
assert(node->isValid());
if (node && modify && (node->getSeq() != mSeq))
{
{ // have a CoW
#ifdef DEBUG
std::cerr << "returnNode COW" << std::endl;
#endif

3
src/SHAMap.h
View File

@@ -258,6 +258,9 @@ public:
// build new map
SHAMap(uint32 seq = 0);
// Returns a new map that's a snapshot of this one. Force CoW
SHAMap::pointer snapShot();
// hold the map stable across operations
ScopedLock Lock() const { return ScopedLock(mLock); }