Replace HashMap COOP transitions with Epoch-Based Reclamation (EBR)

src/coreclr/vm/CMakeLists.txt

@@ -70,6 +70,7 @@ set(VM_SOURCES_DAC_AND_WKS_COMMON
     disassembler.cpp
     domainassembly.cpp
     dynamicmethod.cpp
+    ebr.cpp
     ecall.cpp
     eedbginterfaceimpl.cpp
     eehash.cpp
@@ -169,6 +170,7 @@ set(VM_HEADERS_DAC_AND_WKS_COMMON
     disassembler.h
     domainassembly.h
     dynamicmethod.h
+    ebr.h
     ecall.h
     eedbginterfaceimpl.h
     eedbginterfaceimpl.inl

src/coreclr/vm/ceemain.cpp

@@ -123,6 +123,7 @@
 #include "clsload.hpp"
 #include "object.h"
 #include "hash.h"
+#include "ebr.h"
 #include "ecall.h"
 #include "ceemain.h"
 #include "dllimport.h"
@@ -786,6 +787,10 @@ void EEStartupHelper()
         // Cache the (potentially user-overridden) values now so they are accessible from asm routines
         InitializeSpinConstants();
 
+        // Initialize EBR (Epoch-Based Reclamation) for HashMap's async mode.
+        // This must be done before any HashMap is initialized with fAsyncMode=TRUE.
+        g_HashMapEbr.Init();
+
         StubManager::InitializeStubManagers();
 
         // Set up the cor handle map. This map is used to load assemblies in