BUG: Registry access from multiple threads might fail

MORE INFORMATION

Sample code

   #include <windows.h>
   #include <winbase.h>
   #include <stdio.h>

   #define ITERATIONS 1000
   VOID ThreadFunc(LPVOID);

   void main(void)
   {
    int numThreads=100;
    DWORD threadID;
    int i;

     for (i=0; i<numThreads; i++)
     {
       CreateThread(0, 0,(LPTHREAD_START_ROUTINE) ThreadFunc,
                    0, 0, &threadID);
     }
     return;
   }

   VOID ThreadFunc(LPVOID)
   {
     LONG rc;
     HKEY hKey;

     for(int i=0; i < ITERATIONS; i++)
     {
       rc = RegOpenKeyEx( HKEY_LOCAL_MACHINE, "SOFTWARE\\Microsoft",
                          0, KEY_ALL_ACCESS, &hKey);

       if (rc != ERROR_SUCCESS)
         printf("Iteration(%d): Thread Id: %d, Error=%d\r\n", i,
                                   GetCurrentThreadId(), rc);
       else
          rc = RegCloseKey(hKey);
     }
   }