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IPC Binder

Page history last edited by DannyBarnes 8 years ago

- The concept of Binder: http://www.angryredplanet.com/~hackbod/openbinder/docs/html/index.html

The Binder is a distributed architecture, so you generally don't worry about processes or IPC between them. The Binder infrastructure takes care of making all objects look like they exist in the local process, and dealing with IPC and other issues as needed. It also takes care of resource management between processes, so you are guaranteed that, as long as you have a handle on an object in another process, that the object will continue to exist.

- Why Binder? Mobile OS was designed o run on small handheld or dedicated devices, an environment that imposes some specific requirements on system software that are not an issue in a more traditional desktop environment:

 

1. Hardware scalability: For example, size and battery life are extremely important issues, so a new device may use less powerful hardware than an older device in order to meet these goals. The Binder helps to address this situation by allowing for the creation of system designs that have much more flexibility in how they use hardware. In particular, memory protection and process communication is a significant overhead in modern operating systems, so the Binder strongly supports system design that is not tied to process organization. Instead, the Binder can assign various parts of the system to processes at run time, depending on the particular speed/size/stability/security trade-offs that make sense.

 

2. System customization: Mobile and dedicated devices are unlike desktop machines in that, instead of the "one size fits all" world of the desktop, their user experience zoloft and functionality can vary widely between different devices. Both hardware manufacturers and phone carriers want to deeply customize their behavior, partly to support their branding, but also because these devices need to provide an experience that is more specific to the problems they are trying to solve rather than having a general purpose user interface фотошоп скачать. The Binder's component model, applied to system design luxury hotels, makes it much easier to support this kind of customizability in a manageable way

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3. Robust application: The display and usage pattern of dedicated and mobile devices is also very different than it is on desktops. Desktop-style window management is generally not practical or, if there is no touch screen, even impossible. Because of the limited amount of space on the screen, the currently active application generally wants to consume as much of the available space as possible, essentially becoming the user experience.

 

This usage of the screen can become a significant problem for more complicated applications, such as web browsers. Often a web browser will need to rely on various third party code to display rich content such as movies, code that is itself quite complicated and not under complete control of the browser. If that code happens to crash in a traditional system design, it will at the very least take with it the window it is in which on a mobile device usually means the entire user experience goes away.

 

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The Binder helps address this issue by making it easy for one application to sandbox other parts of itself. For example, a web browser using the Binder could decided to create components for displaying movies and other complicated content in another process, so that if those components crash they will not disrupt the containing browser experience. At the same time, the Binder can easily revert back to using a single process (or only a few) depending on the capabilities of the hardware it is running on.

- IPC Binder documentation: http://www.angryredplanet.com/~hackbod/openbinder/docs/html/BinderIPCMechanism.html

- Why does Android use Binder for IPC: http://groups.google.com/group/android-developers/browse_thread/thread/705cdfde2aa20ce4/dc0e0e872de9b0d2?lnk=raot

- IPC Binder on SDK: http://developer.android.com/reference/android/os/Binder.html

- Example of using IPC Binder: http://mylifewithandroid.blogspot.com/2008/01/about-binders.html

- Architecture:

Android platform libraries

android.os.IBinder, android.os.Binder....

middle layer including Binder...

Dalvik

binder in kernel???

http://groups.google.com/group/android-developers/msg/562cc0b254d96cec

Interprocess Communication (IPC) on Android is facilitated in a number of different ways.  The binder functions as follows:

 

  • State: RECEIVE blocked.  Go to READY when another process sends a message to this process.
  • State: READY.  Go to RECEIVE blocked if we receive a message, SEND blocked if we send a message, and maintain this state for reply or error.
  • State: SEND blocked.  Go to REPLY blocked when another process receives our message.
  • State: REPLY blocked.  Go to READY when another process replies or returns an error.

 

The IPC implementation is from OpenBinder, which is an object-oriented OS environment.  This means immediately that the IPC for Android is at a higher level than in the traditional Linux kernel.  Android does not offer thread libraries (according to the KLDP Wiki), since thread management is possible using these IPC binder utilities.

 

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