Michael137 updated this revision to Diff 519803.
Michael137 added a comment.
Herald added a subscriber: JDevlieghere.
- Add back change dropped in cherry-pick
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D149949/new/
https://reviews.llvm.org/D149949
Files:
lldb/source/Symbol/TypeSystem.cpp
Index: lldb/source/Symbol/TypeSystem.cpp
===================================================================
--- lldb/source/Symbol/TypeSystem.cpp
+++ lldb/source/Symbol/TypeSystem.cpp
@@ -217,11 +217,21 @@
void TypeSystemMap::ForEach(
std::function<bool(lldb::TypeSystemSP)> const &callback) {
- std::lock_guard<std::mutex> guard(m_mutex);
+
+ // The callback may call into this function again causing
+ // us to lock m_mutex twice if we held it across the callback.
+ // Since we just care about guarding access to 'm_map', make
+ // a local copy and iterate over that instead.
+ collection map_snapshot;
+ {
+ std::lock_guard<std::mutex> guard(m_mutex);
+ map_snapshot = m_map;
+ }
+
// Use a std::set so we only call the callback once for each unique
// TypeSystem instance.
llvm::DenseSet<TypeSystem *> visited;
- for (auto &pair : m_map) {
+ for (auto &pair : map_snapshot) {
TypeSystem *type_system = pair.second.get();
if (!type_system || visited.count(type_system))
continue;
Index: lldb/source/Symbol/TypeSystem.cpp
===================================================================
--- lldb/source/Symbol/TypeSystem.cpp
+++ lldb/source/Symbol/TypeSystem.cpp
@@ -217,11 +217,21 @@
void TypeSystemMap::ForEach(
std::function<bool(lldb::TypeSystemSP)> const &callback) {
- std::lock_guard<std::mutex> guard(m_mutex);
+
+ // The callback may call into this function again causing
+ // us to lock m_mutex twice if we held it across the callback.
+ // Since we just care about guarding access to 'm_map', make
+ // a local copy and iterate over that instead.
+ collection map_snapshot;
+ {
+ std::lock_guard<std::mutex> guard(m_mutex);
+ map_snapshot = m_map;
+ }
+
// Use a std::set so we only call the callback once for each unique
// TypeSystem instance.
llvm::DenseSet<TypeSystem *> visited;
- for (auto &pair : m_map) {
+ for (auto &pair : map_snapshot) {
TypeSystem *type_system = pair.second.get();
if (!type_system || visited.count(type_system))
continue;
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