summaryrefslogtreecommitdiff
path: root/tap-win32/lock.h
diff options
context:
space:
mode:
authorAlberto Gonzalez Iniesta <agi@inittab.org>2012-02-21 15:53:40 +0100
committerAlberto Gonzalez Iniesta <agi@inittab.org>2012-02-21 15:53:40 +0100
commit349cfa7acb95abe865209a28e417ec74b56f9bba (patch)
treead65334821b587c4ecdd461be84c94305ffdb888 /tap-win32/lock.h
Imported Upstream version 2.2.1upstream/2.2.1
Diffstat (limited to 'tap-win32/lock.h')
-rwxr-xr-xtap-win32/lock.h75
1 files changed, 75 insertions, 0 deletions
diff --git a/tap-win32/lock.h b/tap-win32/lock.h
new file mode 100755
index 0000000..ea75414
--- /dev/null
+++ b/tap-win32/lock.h
@@ -0,0 +1,75 @@
+/*
+ * TAP-Win32/TAP-Win64 -- A kernel driver to provide virtual tap
+ * device functionality on Windows.
+ *
+ * This code was inspired by the CIPE-Win32 driver by Damion K. Wilson.
+ *
+ * This source code is Copyright (C) 2002-2010 OpenVPN Technologies, Inc.,
+ * 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; \
+ } \
+ } \
+}