--- a/src/hotspot/os/windows/os_windows.hpp	Fri Dec 07 14:36:43 2018 +0530
+++ b/src/hotspot/os/windows/os_windows.hpp	Tue Dec 04 18:55:06 2018 +0100
@@ -26,6 +26,9 @@
 #define OS_WINDOWS_VM_OS_WINDOWS_HPP
 // Win32_OS defines the interface to windows operating systems
 
+// strtok_s is the Windows thread-safe equivalent of POSIX strtok_r
+#define strtok_r strtok_s
+
 // Information about the protection of the page at address '0' on this os.
 static bool zero_page_read_protected() { return true; }
 

--- a/src/hotspot/share/classfile/vmSymbols.cpp	Fri Dec 07 14:36:43 2018 +0530
+++ b/src/hotspot/share/classfile/vmSymbols.cpp	Tue Dec 04 18:55:06 2018 +0100
@@ -473,15 +473,16 @@
   // Note, DirectiveSet may not be created at this point yet since this code
   // is called from initial stub geenration code.
   char* local_list = (char*)DirectiveSet::canonicalize_disableintrinsic(DisableIntrinsic);
-
+  char* save_ptr;
   bool found = false;
-  char* token = strtok(local_list, ",");
+
+  char* token = strtok_r(local_list, ",", &save_ptr);
   while (token != NULL) {
     if (strcmp(token, vmIntrinsics::name_at(id)) == 0) {
       found = true;
       break;
     } else {
-      token = strtok(NULL, ",");
+      token = strtok_r(NULL, ",", &save_ptr);
     }
   }
 

--- a/src/hotspot/share/compiler/compilerDirectives.cpp	Fri Dec 07 14:36:43 2018 +0530
+++ b/src/hotspot/share/compiler/compilerDirectives.cpp	Tue Dec 04 18:55:06 2018 +0100
@@ -398,13 +398,14 @@
   size_t length = strlen(DisableIntrinsicOption);
   char* local_list = NEW_RESOURCE_ARRAY(char, length + 1);
   strncpy(local_list, DisableIntrinsicOption, length + 1);
+  char* save_ptr;
 
-  char* token = strtok(local_list, ",");
+  char* token = strtok_r(local_list, ",", &save_ptr);
   while (token != NULL) {
     if (strcmp(token, vmIntrinsics::name_at(id)) == 0) {
       return true;
     } else {
-      token = strtok(NULL, ",");
+      token = strtok_r(NULL, ",", &save_ptr);
     }
   }
 

--- a/src/hotspot/share/gc/g1/g1Arguments.cpp	Fri Dec 07 14:36:43 2018 +0530
+++ b/src/hotspot/share/gc/g1/g1Arguments.cpp	Tue Dec 04 18:55:06 2018 +0100
@@ -44,10 +44,12 @@
     size_t length = strlen(VerifyGCType);
     char* type_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
     strncpy(type_list, VerifyGCType, length + 1);
-    char* token = strtok(type_list, delimiter);
+    char* save_ptr;
+
+    char* token = strtok_r(type_list, delimiter, &save_ptr);
     while (token != NULL) {
       parse_verification_type(token);
-      token = strtok(NULL, delimiter);
+      token = strtok_r(NULL, delimiter, &save_ptr);
     }
     FREE_C_HEAP_ARRAY(char, type_list);
   }

--- a/src/hotspot/share/memory/universe.cpp	Fri Dec 07 14:36:43 2018 +0530
+++ b/src/hotspot/share/memory/universe.cpp	Tue Dec 04 18:55:06 2018 +0100
@@ -1118,8 +1118,9 @@
   size_t length = strlen(VerifySubSet);
   char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
   strncpy(subset_list, VerifySubSet, length + 1);
+  char* save_ptr;
 
-  char* token = strtok(subset_list, delimiter);
+  char* token = strtok_r(subset_list, delimiter, &save_ptr);
   while (token != NULL) {
     if (strcmp(token, "threads") == 0) {
       verify_flags |= Verify_Threads;
@@ -1144,7 +1145,7 @@
     } else {
       vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
     }
-    token = strtok(NULL, delimiter);
+    token = strtok_r(NULL, delimiter, &save_ptr);
   }
   FREE_C_HEAP_ARRAY(char, subset_list);
 }