mirror of
https://github.com/Telecominfraproject/OpenCellular.git
synced 2025-12-29 18:11:05 +00:00
d89301b036
Some systems, such as Android, do not support SysV semaphore locks. This implements an alternative file lock mechanism using flock(). flock() was chosen because it's pretty straight forward. It's known to be broken when using NFS, but I doubt we'll ever store our lock on an NFS volume. CQ-DEPEND=CL:327407,CL:325609 BUG=chrome-os-partner:49527 BRANCH=none TEST=tested on Smaug by running mosys and ectool while reading firmware ROM with flashrom, all three utilities eventually ran successfully. Change-Id: Ic73fe0281fbc1dfaae1bb03e5683774a0c04ae5b Signed-off-by: David Hendricks <dhendrix@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/329430 Reviewed-by: Shawn N <shawnn@chromium.org>
46 lines
1.8 KiB
C
46 lines
1.8 KiB
C
/* Copyright 2012, Google Inc.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are
|
|
* met:
|
|
*
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above
|
|
* copyright notice, this list of conditions and the following
|
|
* disclaimer in the documentation and/or other materials provided
|
|
* with the distribution.
|
|
* * Neither the name of Google Inc. nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "gec_lock.h"
|
|
#include "ipc_lock.h"
|
|
#include "locks.h"
|
|
|
|
static struct ipc_lock gec_lock = LOCKFILE_INIT(CROS_EC_LOCKFILE_NAME);
|
|
|
|
int acquire_gec_lock(int timeout_secs)
|
|
{
|
|
return acquire_lock(&gec_lock, timeout_secs * 1000);
|
|
}
|
|
|
|
int release_gec_lock(void)
|
|
{
|
|
return release_lock(&gec_lock);
|
|
}
|