1 files changed, 95 insertions, 0 deletions
diff --git a/private/csr/server/session.c b/private/csr/server/session.c
new file mode 100644
index 000000000..729d9a8ba
--- /dev/null
+++ b/private/csr/server/session.c
@@ -0,0 +1,95 @@
+/*++
+
+Copyright (c) 1989  Microsoft Corporation
+
+Module Name:
+
+    session.c
+
+Abstract:
+
+    This module contains the worker routines called by the Sb API
+    Request routines in sbapi.c to create and delete sessions.  Also
+    called whenever an application process creates a new child process
+    within the same session.
+
+Author:
+
+    Steve Wood (stevewo) 08-Oct-1990
+
+Revision History:
+
+--*/
+
+
+#include "csrsrv.h"
+
+NTSTATUS
+CsrInitializeNtSessionList( VOID )
+{
+    NTSTATUS Status;
+
+    InitializeListHead( &CsrNtSessionList );
+
+    Status = RtlInitializeCriticalSection( &CsrNtSessionLock );
+    return( Status );
+}
+
+
+PCSR_NT_SESSION
+CsrAllocateNtSession(
+    ULONG SessionId
+    )
+{
+    PCSR_NT_SESSION Session;
+
+    Session = RtlAllocateHeap( CsrHeap, MAKE_TAG( PROCESS_TAG ), sizeof( CSR_NT_SESSION ) );
+    ASSERT( Session != NULL );
+
+    if (Session != NULL) {
+        Session->SessionId = SessionId;
+        Session->ReferenceCount = 1;
+        LockNtSessionList();
+        InsertHeadList( &CsrNtSessionList, &Session->SessionLink );
+        UnlockNtSessionList();
+        }
+
+    return( Session );
+}
+
+VOID
+CsrReferenceNtSession(
+    PCSR_NT_SESSION Session
+    )
+{
+    LockNtSessionList();
+
+    ASSERT( !IsListEmpty( &Session->SessionLink ) );
+    ASSERT( Session->SessionId != 0 );
+    ASSERT( Session->ReferenceCount != 0 );
+    Session->ReferenceCount++;
+    UnlockNtSessionList();
+}
+
+VOID
+CsrDereferenceNtSession(
+    PCSR_NT_SESSION Session,
+    NTSTATUS ExitStatus
+    )
+{
+    LockNtSessionList();
+
+    ASSERT( !IsListEmpty( &Session->SessionLink ) );
+    ASSERT( Session->SessionId != 0 );
+    ASSERT( Session->ReferenceCount != 0 );
+
+    if (--Session->ReferenceCount == 0) {
+        RemoveEntryList( &Session->SessionLink );
+        UnlockNtSessionList();
+        SmSessionComplete(CsrSmApiPort,Session->SessionId,ExitStatus);
+        RtlFreeHeap( CsrHeap, 0, Session );
+        }
+    else {
+        UnlockNtSessionList();
+        }
+}