1 /*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #define ATRACE_TAG ATRACE_TAG_GRAPHICS
18 #define LOG_TAG "hwc-drm-auto-lock"
19
20 #include "autolock.h"
21
22 #include <errno.h>
23 #include <pthread.h>
24
25 #include <log/log.h>
26
27 namespace android {
28
Lock()29 int AutoLock::Lock() {
30 if (locked_) {
31 ALOGE("Invalid attempt to double lock AutoLock %s", name_);
32 return -EINVAL;
33 }
34 int ret = pthread_mutex_lock(mutex_);
35 if (ret) {
36 ALOGE("Failed to acquire %s lock %d", name_, ret);
37 return ret;
38 }
39 locked_ = true;
40 return 0;
41 }
42
Unlock()43 int AutoLock::Unlock() {
44 if (!locked_) {
45 ALOGE("Invalid attempt to unlock unlocked AutoLock %s", name_);
46 return -EINVAL;
47 }
48 int ret = pthread_mutex_unlock(mutex_);
49 if (ret) {
50 ALOGE("Failed to release %s lock %d", name_, ret);
51 return ret;
52 }
53 locked_ = false;
54 return 0;
55 }
56 } // namespace android
57