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Diffstat (limited to 'media/libstagefright/foundation/AWakeLock.cpp')
-rw-r--r-- | media/libstagefright/foundation/AWakeLock.cpp | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/media/libstagefright/foundation/AWakeLock.cpp b/media/libstagefright/foundation/AWakeLock.cpp new file mode 100644 index 0000000..88c4f6e --- /dev/null +++ b/media/libstagefright/foundation/AWakeLock.cpp @@ -0,0 +1,109 @@ +/* + * Copyright (C) 2015 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +//#define LOG_NDEBUG 0 +#define LOG_TAG "AWakeLock" +#include <utils/Log.h> + +#include "ADebug.h" +#include "AWakeLock.h" + +#include <binder/IPCThreadState.h> +#include <binder/IServiceManager.h> +#include <powermanager/PowerManager.h> + + +namespace android { + +AWakeLock::AWakeLock() : + mPowerManager(NULL), + mWakeLockToken(NULL), + mWakeLockCount(0), + mDeathRecipient(new PMDeathRecipient(this)) {} + +AWakeLock::~AWakeLock() { + if (mPowerManager != NULL) { + sp<IBinder> binder = mPowerManager->asBinder(); + binder->unlinkToDeath(mDeathRecipient); + } + clearPowerManager(); +} + +bool AWakeLock::acquire() { + if (mWakeLockCount == 0) { + CHECK(mWakeLockToken == NULL); + if (mPowerManager == NULL) { + // use checkService() to avoid blocking if power service is not up yet + sp<IBinder> binder = + defaultServiceManager()->checkService(String16("power")); + if (binder == NULL) { + ALOGW("could not get the power manager service"); + } else { + mPowerManager = interface_cast<IPowerManager>(binder); + binder->linkToDeath(mDeathRecipient); + } + } + if (mPowerManager != NULL) { + sp<IBinder> binder = new BBinder(); + int64_t token = IPCThreadState::self()->clearCallingIdentity(); + status_t status = mPowerManager->acquireWakeLock( + POWERMANAGER_PARTIAL_WAKE_LOCK, + binder, String16("AWakeLock"), String16("media")); + IPCThreadState::self()->restoreCallingIdentity(token); + if (status == NO_ERROR) { + mWakeLockToken = binder; + mWakeLockCount++; + return true; + } + } + } else { + mWakeLockCount++; + return true; + } + return false; +} + +void AWakeLock::release(bool force) { + if (mWakeLockCount == 0) { + return; + } + if (force) { + // Force wakelock release below by setting reference count to 1. + mWakeLockCount = 1; + } + if (--mWakeLockCount == 0) { + CHECK(mWakeLockToken != NULL); + if (mPowerManager != NULL) { + int64_t token = IPCThreadState::self()->clearCallingIdentity(); + mPowerManager->releaseWakeLock(mWakeLockToken, 0 /* flags */); + IPCThreadState::self()->restoreCallingIdentity(token); + } + mWakeLockToken.clear(); + } +} + +void AWakeLock::clearPowerManager() { + release(true); + mPowerManager.clear(); +} + +void AWakeLock::PMDeathRecipient::binderDied(const wp<IBinder>& who __unused) { + if (mWakeLock != NULL) { + mWakeLock->clearPowerManager(); + } +} + +} // namespace android |