1 /* Copyright 2012, Google Inc.
2 * All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following
12 * disclaimer in the documentation and/or other materials provided
13 * with the distribution.
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived
16 * from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include <stdbool.h>
32
33 #include "big_lock.h"
34 #include "ipc_lock.h"
35 #include "flash.h"
36
37 #define LOCKFILE_NAME "firmware_utility_lock"
38 static struct ipc_lock big_lock = LOCKFILE_INIT(LOCKFILE_NAME);
39 /** Big lock acquisition status. */
40 static bool g_big_lock_acquired = false;
41
acquire_big_lock(int timeout_secs)42 int acquire_big_lock(int timeout_secs)
43 {
44 msg_gdbg("Acquiring lock (timeout=%d sec)...\n", timeout_secs);
45 int ret = acquire_lock(&big_lock, timeout_secs * 1000);
46 if (ret < 0) {
47 msg_gerr("Could not acquire lock.\n");
48 } else {
49 g_big_lock_acquired = true;
50 msg_gdbg("Lock acquired.\n");
51 }
52 return ret;
53 }
54
release_big_lock(void)55 int release_big_lock(void)
56 {
57 int ret = 0;
58 if (g_big_lock_acquired) {
59 ret = release_lock(&big_lock);
60 g_big_lock_acquired = false;
61 }
62 return ret;
63 }
64