mirror of
https://github.com/zerotier/ZeroTierOne.git
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76 lines
3.2 KiB
C
76 lines
3.2 KiB
C
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/*
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* TAP-Windows -- A kernel driver to provide virtual tap
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* device functionality on Windows.
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*
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* This code was inspired by the CIPE-Win32 driver by Damion K. Wilson.
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*
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* This source code is Copyright (C) 2002-2014 OpenVPN Technologies, Inc.,
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* and is released under the GPL version 2 (see below).
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (see the file COPYING included with this
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* distribution); if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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typedef struct
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{
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volatile long count;
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} MUTEX;
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#define MUTEX_SLEEP_TIME 10000 // microseconds
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#define INIT_MUTEX(m) { (m)->count = 0; }
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#define ACQUIRE_MUTEX_BLOCKING(m) \
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{ \
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while (NdisInterlockedIncrement (&((m)->count)) != 1) \
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{ \
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NdisInterlockedDecrement(&((m)->count)); \
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NdisMSleep(MUTEX_SLEEP_TIME); \
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} \
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}
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#define RELEASE_MUTEX(m) \
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{ \
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NdisInterlockedDecrement(&((m)->count)); \
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}
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#define ACQUIRE_MUTEX_NONBLOCKING(m, result) \
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{ \
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if (NdisInterlockedIncrement (&((m)->count)) != 1) \
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{ \
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NdisInterlockedDecrement(&((m)->count)); \
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result = FALSE; \
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} \
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else \
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{ \
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result = TRUE; \
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} \
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}
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#define ACQUIRE_MUTEX_ADAPTIVE(m, result) \
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{ \
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result = TRUE; \
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while (NdisInterlockedIncrement (&((m)->count)) != 1) \
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{ \
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NdisInterlockedDecrement(&((m)->count)); \
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if (KeGetCurrentIrql () < DISPATCH_LEVEL) \
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NdisMSleep(MUTEX_SLEEP_TIME); \
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else \
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{ \
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result = FALSE; \
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break; \
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} \
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} \
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}
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