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/*
* Copyright (C) 2012 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.
*/
package com.android.server.power;
import android.util.proto.ProtoOutputStream;
/**
* Low-level suspend blocker mechanism equivalent to holding a partial wake lock.
*
* This interface is used internally to avoid introducing internal dependencies
* on the high-level wake lock mechanism.
*/
interface SuspendBlocker {
/**
* Acquires the suspend blocker.
* Prevents the CPU from going to sleep.
*
* Calls to acquire() nest and must be matched by the same number
* of calls to release().
*/
void acquire();
/**
* Acquires the suspend blocker.
* Prevents the CPU from going to sleep.
*
* Calls to acquire() nest and must be matched by the same number
* of calls to release().
*
* @param id Identifier for this particular acquire. Used for tracking/logging.
*/
void acquire(String id);
/**
* Releases the suspend blocker.
* Allows the CPU to go to sleep if no other suspend blockers are held.
*
* It is an error to call release() if the suspend blocker has not been acquired.
* The system may crash.
*/
void release();
/**
* Releases the suspend blocker.
* Allows the CPU to go to sleep if no other suspend blockers are held.
*
* It is an error to call release() if the suspend blocker has not been acquired.
* The system may crash.
*
* @param id Identifier for this particular release. Used for tracking/logging.
*/
void release(String id);
void dumpDebug(ProtoOutputStream proto, long fieldId);
}
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