1 files changed, 79 insertions, 0 deletions
diff --git a/openvpn/tap-win32/lock.h b/openvpn/tap-win32/lock.h
new file mode 100755
index 0000000..8598f31
--- /dev/null
+++ b/openvpn/tap-win32/lock.h
@@ -0,0 +1,79 @@
+/*
+ *  TAP-Win32 -- A kernel driver to provide virtual tap device
+ *               functionality on Windows.  Originally derived
+ *               from the CIPE-Win32 project by Damion K. Wilson,
+ *               with extensive modifications by James Yonan.
+ *
+ *  All source code which derives from the CIPE-Win32 project is
+ *  Copyright (C) Damion K. Wilson, 2003, and is released under the
+ *  GPL version 2 (see below).
+ *
+ *  All other source code is Copyright (C) 2002-2005 OpenVPN Solutions LLC,
+ *  and is released under the GPL version 2 (see below).
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2
+ *  as published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program (see the file COPYING included with this
+ *  distribution); if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+typedef struct
+{
+  volatile long count;
+} MUTEX;
+
+#define MUTEX_SLEEP_TIME  10000 // microseconds
+
+#define INIT_MUTEX(m) { (m)->count = 0; }
+
+#define ACQUIRE_MUTEX_BLOCKING(m)                         \
+{                                                         \
+    while (NdisInterlockedIncrement (&((m)->count)) != 1) \
+    {                                                     \
+        NdisInterlockedDecrement(&((m)->count));          \
+        NdisMSleep(MUTEX_SLEEP_TIME);                     \
+    }                                                     \
+}
+
+#define RELEASE_MUTEX(m)                                  \
+{                                                         \
+        NdisInterlockedDecrement(&((m)->count));          \
+}
+
+#define ACQUIRE_MUTEX_NONBLOCKING(m, result)              \
+{                                                         \
+    if (NdisInterlockedIncrement (&((m)->count)) != 1)    \
+    {                                                     \
+        NdisInterlockedDecrement(&((m)->count));          \
+        result = FALSE;                                   \
+    }                                                     \
+    else                                                  \
+    {                                                     \
+	result = TRUE;                                    \
+    }                                                     \
+}
+
+#define ACQUIRE_MUTEX_ADAPTIVE(m, result)                 \
+{                                                         \
+    result = TRUE;                                        \
+    while (NdisInterlockedIncrement (&((m)->count)) != 1) \
+    {                                                     \
+        NdisInterlockedDecrement(&((m)->count));          \
+        if (KeGetCurrentIrql () < DISPATCH_LEVEL)         \
+            NdisMSleep(MUTEX_SLEEP_TIME);                 \
+        else                                              \
+        {                                                 \
+	    result = FALSE;                               \
+	    break;                                        \
+        }                                                 \
+    }                                                     \
+}