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-rwxr-xr-xtap-win32/lock.h79
1 files changed, 79 insertions, 0 deletions
diff --git a/tap-win32/lock.h b/tap-win32/lock.h
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+++ b/tap-win32/lock.h
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+/*
+ * 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; \
+ } \
+ } \
+}