From 2e4f8bfdb1be9d24347d2c71f80785aef4eff824 Mon Sep 17 00:00:00 2001
From: Hartmut Birr <osexpert@googlemail.com>
Date: Sat, 30 Jul 2005 19:03:34 +0000
Subject: [PATCH] If a mutex already exist, open it instead of create.

svn path=/trunk/; revision=16901
---
 reactos/lib/kernel32/synch/mutex.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/reactos/lib/kernel32/synch/mutex.c b/reactos/lib/kernel32/synch/mutex.c
index 854901d3a9e..9752796251a 100644
--- a/reactos/lib/kernel32/synch/mutex.c
+++ b/reactos/lib/kernel32/synch/mutex.c
@@ -92,10 +92,24 @@ CreateMutexW(LPSECURITY_ATTRIBUTES lpMutexAttributes,
 			   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;