android binder

In this article, we will thoroughly analyze servicemanager, the service administrator of the Android system. Servicemanager is the manager of Android system services. All processes that need to communicate with each other through the Binder Mechanism must first obtain the proxy object of the Service Manager for binder

Although Android is built on Linux, it implements a lightweight IPC Mechanism instead of using Linux to provide the IPC Mechanism.-- Binder Mechanism. And androidBased on the Binder Mechanism, the android framework provides a set of encapsulation that can implement object proxy (proxy for objects in Remote Processes in

Binder is the core of Android's interprocess communication, if you look at the Android source code, you will find that the source of Android's various core services are through the binder mechanism to communicate with each other. In the client part of binder, the server side is accessed through proxy mode. This is to i

Asynchronous interaction is not completed, for example, if it is being processed by a thread or queuing in any of the to-do queues, the Asynchronous interaction package sent to the object will not be delivered to the to-do queue, it is blocked in the Asynchronous interaction receiving Queue (async_todo domain of the binder node) opened for the object. However, during this period, synchronous interaction is still unrestricted and directly enters the t

Thinking analysis, is the following process:How did the ServiceManager start?According to our previous blog ideas, we have a servicemanager agent on the systemserver side, Then the Android system should provide inheritance like AMS or indirectly inherit from Java layer Binder and then rewrite the Ontransact method to handle the request. However, ServiceManager does not use a complex

First, prefaceIn the previous blog Android IPC mechanism (ii): Aidl's basic usage, the author describes a major way of communication between Android processes. Use Aidl for communication. The basic usage of aidl is also introduced.In fact, the Aidl method uses binders for cross-process communication. Binder is a way of communicating across processes in

In the above "Binder Mechanism 2 of Android system -- Service proxy object (1)", we learned the Service proxy object bpbinder at the C/C ++ layer of the process, and the underlying Processing Method of binder. In this article, we will analyze in depth the creation and use of Service proxy objects at the Java layer of the process.C/C ++ and Java layers of the

As an IPC communication mechanism, the binder mechanism plays a very important role in the Android system, so I also spent some time to study it, according to my understanding, I will from 4 aspects of the binder, if there is a wrong place, but also hope that we can advise. The following examples will be in mediaserver terms.First, ServiceManagerServiceManager in

explicitly unbound. However, all clients should be unbound at the right time (for example, when the activity is paused ). Sample Code: LocalService. Java /** Copyright (c) 2007 the android open source project** Licensed under the Apache license, version 2.0 (the "License ");* You may not use this file before t in compliance with the license.* You may obtain a copy of the license** Http://www.apache.org/licenses/LICENSE-2.0** Unless required by appli

Android binder Mechanism 2 (client and common server), androidbinder Before talking about the communication between them, let's take MediaServer as an example to see what common Server processes are doing. Int main (){...... // Obtain the ProcessState instance sp Defaservicservicemanager () has been introduced in the previous article.MediaPlayerService: instantiate () is implemented as follows, that is,

Binder: Pins, paper clips. In life, we use a paper clip to "do not" with two sheets. In Android, Binder is used for interprocess communication, and two processes are "not" together.Binder is an architecture with 3 modules (server-side interface, Binder driver, customer-service interface), such as:The

I. Main communication methods between processes in Linux 1. Socket; 2. Name pipe name pipeline; 3. Message Queue; 4. Singal semaphore; 5. share memory shared memory; 6. semophore semaphore Ii. Main communication methods of the Java System 1. Socket; 2. Name pipe; Iii. Main communication modes of Android system Binder Communication Pipe Socket Share memory 4. What are the advantages of

Binder: a paper clip or paper clip. We often use pins to separate two sheets of paper. In the Android system, binder is the basic framework used to complete inter-process communication IPC, that is to say, different processes are separated so that each process can transmit messages to each other. If you have developed a Java server, you can also think of it as an

This article refers to "Android system source code scenario analysis", author Luo ShenyangFirst, the test code:~/android/external/binder/server----FregServer.cpp~/android/external/binder/common----IFregService.cpp----IFregService.h~/andr