weaselab/versioned-map
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Explain intent of condition

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Andrew Noyes
2024-05-04 12:02:55 -07:00
parent 8e1faadd30
commit bfbe9638eb
1 changed files with 2 additions and 0 deletions
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RootSet.cpp
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@@ -105,6 +105,8 @@ struct RootSet::Impl {
void setOldestVersion(int64_t oldestVersion) { void setOldestVersion(int64_t oldestVersion) {
this->oldestVersion = oldestVersion; this->oldestVersion = oldestVersion;
// This condition is basically "while it would be incorrect to read
// firstToFree at oldestVersion - 1"
while (firstToFree != nullptr && firstToFree->next != nullptr && while (firstToFree != nullptr && firstToFree->next != nullptr &&
firstToFree->next->versions()[firstToFree->next->end.load( firstToFree->next->versions()[firstToFree->next->end.load(
std::memory_order_relaxed) - std::memory_order_relaxed) -