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[lldb][plugin] Use counter directly for number of readers #139252

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Merged
jpienaar merged 6 commits into from
May 13, 2025
+13 −12
Merged

[lldb][plugin] Use counter directly for number of readers #139252

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c5ffbd8
[lldb][plugin] Clear in same thread as set
jpienaar May 9, 2025
5f5b8dc
Fix typo
jpienaar May 9, 2025
1d464bd
Merge branch 'main' into users/jpienaar/unlocked_shared_lock_other_th…
jpienaar May 12, 2025
6d8c69c
Use plain reader counter
jpienaar May 12, 2025
180c82f
Simplify critical region
jpienaar May 12, 2025
a6ecf88
Add timeout to diagnostics test
jpienaar May 13, 2025
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12 changes: 9 additions & 3 deletions lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -189,17 +189,23 @@ DWARFUnit::ScopedExtractDIEs DWARFUnit::ExtractDIEsScoped() {
}

DWARFUnit::ScopedExtractDIEs::ScopedExtractDIEs(DWARFUnit &cu) : m_cu(&cu) {
m_cu->m_die_array_scoped_mutex.lock_shared();
llvm::sys::ScopedLock lock(m_cu->m_die_array_scoped_mutex);
++m_cu->m_die_array_scoped_count;
}

DWARFUnit::ScopedExtractDIEs::~ScopedExtractDIEs() {
if (!m_cu)
return;
m_cu->m_die_array_scoped_mutex.unlock_shared();
{
llvm::sys::ScopedLock lock(m_cu->m_die_array_scoped_mutex);
--m_cu->m_die_array_scoped_count;
if (m_cu->m_die_array_scoped_count == 0)
return;
}
if (!m_clear_dies || m_cu->m_cancel_scopes)
return;
// Be sure no other ScopedExtractDIEs is running anymore.
llvm::sys::ScopedWriter lock_scoped(m_cu->m_die_array_scoped_mutex);
llvm::sys::ScopedLock lock_scoped(m_cu->m_die_array_scoped_mutex);
llvm::sys::ScopedWriter lock(m_cu->m_die_array_mutex);
if (m_cu->m_cancel_scopes)
return;
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4 changes: 3 additions & 1 deletion lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.h
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@
#include "llvm/DebugInfo/DWARF/DWARFAddressRange.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugAbbrev.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugRnglists.h"
#include "llvm/Support/Mutex.h"
#include "llvm/Support/RWMutex.h"
#include <atomic>
#include <optional>
Expand Down Expand Up @@ -328,7 +329,8 @@ class DWARFUnit : public DWARFExpression::Delegate, public UserID {
DWARFDebugInfoEntry::collection m_die_array;
mutable llvm::sys::RWMutex m_die_array_mutex;
// It is used for tracking of ScopedExtractDIEs instances.
mutable llvm::sys::RWMutex m_die_array_scoped_mutex;
mutable llvm::sys::Mutex m_die_array_scoped_mutex;
mutable int m_die_array_scoped_count = 0;
// ScopedExtractDIEs instances should not call ClearDIEsRWLocked()
// as someone called ExtractDIEsIfNeeded().
std::atomic<bool> m_cancel_scopes;
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