max/nix-super
1
0
Fork 0
mirror of https://github.com/privatevoid-net/nix-super.git synced 2024-11-10 00:08:07 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

Make RegexCache thread-safe

Browse source
This commit is contained in:
Eelco Dolstra 2024-05-31 19:18:38 +02:00
parent b36aa04b53
commit fbbca59453
1 changed files with 13 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

20
src/libexpr/primops.cc
View file

@ -4062,17 +4062,23 @@ static RegisterPrimOp primop_convertHash({
struct RegexCache
{
// TODO use C++20 transparent comparison when available
std::unordered_map<std::string_view, std::regex> cache;
std::list<std::string> keys;
struct State
{
// TODO use C++20 transparent comparison when available
std::unordered_map<std::string_view, std::regex> cache;
std::list<std::string> keys;
};
Sync<State> state_;
std::regex get(std::string_view re)
{
auto it = cache.find(re);
if (it != cache.end())
auto state(state_.lock());
auto it = state->cache.find(re);
if (it != state->cache.end())
return it->second;
keys.emplace_back(re);
return cache.emplace(keys.back(), std::regex(keys.back(), std::regex::extended)).first->second;
state->keys.emplace_back(re);
return state->cache.emplace(state->keys.back(), std::regex(state->keys.back(), std::regex::extended)).first->second;
}
};