[tfaber] 64702: [RTL] - Allow the thread that called LdrShutdownProcess to forcefully acquire critical sections (the loader lock in particular). This fixes the race condition where ExitProcess migh...

Author: tfaber
Date: Sun Oct 12 20:45:32 2014
New Revision: 64702

URL: http://svn.reactos.org/svn/reactos?rev=64702&view=rev
Log:
[RTL]
- Allow the thread that called LdrShutdownProcess to forcefully acquire critical sections (the loader lock in particular).
This fixes the race condition where ExitProcess might terminate a thread holding the loader lock and subsequently call LdrShutdownProcess. That would then result in a deadlock because LdrShutdownProcess cannot acquire the loader lock.
This is a pretty ugly hack... but at least Windows does it the same way.
Fixes hangs after the summary line when running mshtml tests.
CORE-8624 #resolve

Modified:
    trunk/reactos/lib/rtl/critical.c

Modified: trunk/reactos/lib/rtl/critical.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/lib/rtl/critical.c?rev=6470...
==============================================================================
--- trunk/reactos/lib/rtl/critical.c	[iso-8859-1] (original)
+++ trunk/reactos/lib/rtl/critical.c	[iso-8859-1] Sun Oct 12 20:45:32 2014
@@ -23,6 +23,9 @@
 static BOOLEAN RtlpDebugInfoFreeList[MAX_STATIC_CS_DEBUG_OBJECTS];
 LARGE_INTEGER RtlpTimeout;

+extern BOOLEAN LdrpShutdownInProgress;
+extern HANDLE LdrpShutdownThreadId;
+
 /* FUNCTIONS *****************************************************************/

/*++
@@ -124,6 +127,18 @@

if (CriticalSection->DebugInfo)
         CriticalSection->DebugInfo->EntryCount++;
+
+    /*
+     * If we're shutting down the process, we're allowed to acquire any
+     * critical sections by force (the loader lock in particular)
+     */
+    if (LdrpShutdownInProgress &&
+        LdrpShutdownThreadId == NtCurrentTeb()->RealClientId.UniqueThread)
+    {
+        DPRINT("Forcing ownership of critical section %p\n", CriticalSection);
+        CriticalSection->LockCount = 0;
+        return STATUS_SUCCESS;
+    }

for (;;)
     {