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 <cutils/log.h> 26 27namespace android { 28 29int 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 43int 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} 57