mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-22 06:17:48 +00:00
76 lines
3.2 KiB
C
76 lines
3.2 KiB
C
|
/*
|
||
|
|
* TAP-Windows -- 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) 2002-2014 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; \
|
||
|
|
} \
|
||
|
|
} \
|
||
|
|
}
|