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MCOL-5487 Managed shmem segment access/remap race

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There is a potential edge case when a thread remaps EM
    managed shmem segment in grabEMEntryTable() whilst another
    thread access the current shmem segment mapping in virtual memory
This commit is contained in:
Roman Nozdrin
2023-04-26 17:36:21 +00:00
parent 445eb75e4f
commit eab91b5022
2 changed files with 23 additions and 6 deletions
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5
versioning/BRM/extentmap.h
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@ -34,7 +34,7 @@
#include <tr1/unordered_map>
#include <mutex>
//#define NDEBUG
// #define NDEBUG
#include <cassert>
#include <boost/functional/hash.hpp> //boost::hash
#include <boost/interprocess/allocators/allocator.hpp>
@ -253,7 +253,8 @@ class ExtentMapRBTreeImpl
public:
~ExtentMapRBTreeImpl() = default;
static ExtentMapRBTreeImpl* makeExtentMapRBTreeImpl(unsigned key, off_t size, bool readOnly = false);
static ExtentMapRBTreeImpl* makeExtentMapRBTreeImpl(unsigned key, off_t size, bool readOnly, bool& emLocked,
const MasterSegmentTable* emSegTable = nullptr);
static void refreshShm()
{