[ros-diffs] [hbirr] 16901: If a mutex already exist, open it instead of create.

[hbirr at svn.reactos.com]

If a mutex already exist, open it instead of create.
Modified: trunk/reactos/lib/kernel32/synch/mutex.c
  _____  

Modified: trunk/reactos/lib/kernel32/synch/mutex.c
--- trunk/reactos/lib/kernel32/synch/mutex.c	2005-07-30 19:00:33 UTC
(rev 16900)
+++ trunk/reactos/lib/kernel32/synch/mutex.c	2005-07-30 19:03:34 UTC
(rev 16901)
@@ -92,10 +92,24 @@

 			   MUTEX_ALL_ACCESS,
 			   &ObjectAttributes,
 			   (BOOLEAN)bInitialOwner);
+   if (Status == STATUS_OBJECT_NAME_COLLISION)
+     {
+       Status = NtOpenMutant(&MutantHandle,
+			     MUTEX_ALL_ACCESS,
+			     &ObjectAttributes);
+       if (NT_SUCCESS(Status))
+         {
+	   if(bInitialOwner)
+             {
+               WaitForSingleObject(MutantHandle, INFINITE);
+	     }
+           SetLastError(ERROR_ALREADY_EXISTS);
+	 }
+     }
    if (!NT_SUCCESS(Status))
      {
-	SetLastErrorByStatus(Status);
-	return NULL;
+       SetLastErrorByStatus(Status);
+       return NULL;
      }
 
    return MutantHandle;
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