Android共享内存-阿里云

Android系统的Ashmem匿名共享内存子系统分析（3）- Ashmem子系统的 C/C++访问接口

在C/C++代码中，可以使用以下函数来操作Ashmem共享内存： int ashmem_create_region(const char *name, size_t size) 该函数用于创建一个匿名共享内存区域，并返回一个文件描述符。参数name表示该共享内存区域的名称，size表示共享内存区域的...

Android匿名共享内存（Ashmem）原理

阅读之前，不妨先思考一个问题，在Android系统中，APP端View视图的数据是如何传递SurfaceFlinger服务的呢？View绘制的数据最终是按照一帧一帧显示到屏幕的，而每一帧都会占用一定的存储空间，在APP端执行draw的时候，数据很明显是要绘制到APP的进程空间，但是视图...

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android的匿名共享内存函数

基础原理android系统在应用程序框架层中提供了两个C++类MemoryHeapBase和MemoryBase来创建和管理匿名共享内存。如果一个进程需要与其他进程共享一块完整的匿名共享内存，那么就可以通过使用MemoryHeapBase类类创建这块匿名共享内存。如果一个进程创建一块匿名共享内存后，...

Android系统匿名共享内存（Anonymous Shared Memory）C++调用接口分析（6）

   接下来，我们再来看看server模块的实现。在external/ashmem/common目录下，只有一个源文件SharedBufferServer.cpp，它实现了内存共享服务SharedBufferService： #define LOG_TAG "...

Android系统匿名共享内存Ashmem（Anonymous Shared Memory）在进程间共享的原理分析

在前面一篇文章Android系统匿名共享内存Ashmem（Anonymous Shared Memory）驱动程序源代码分析中，我们系统地介绍了Android系统匿名共享内存的实现原理，其中着重介绍了它是如何辅助内存管理系统来有效地管理内存的，在再前面一篇文章Android系统匿名共享内...

Android系统匿名共享内存Ashmem（Anonymous Shared Memory）简要介绍和学习计划

在Android系统中，提供了独特的匿名共享内存子系统Ashmem（Anonymous Shared Memory），它以驱动程序的形式实现在内核空间中。它有两个特点，一是能够辅助内存管理系统来有效地管理不再使用的内存块，二是它通过Binder进程间通信机制来实现进程间的内存共享。本文中，我们将通过...

Android系统匿名共享内存Ashmem（Anonymous Shared Memory）驱动程序源代码分析（下)

四. 匿名共享内存的锁定和解锁操作前面提到，Android系统的运行时库提到了执行匿名共享内存的锁定和解锁操作的两个函数ashmem_pin_region和ashmem_unpin_region，它们实现在sy...

Android系统匿名共享内存（Anonymous Shared Memory）C++调用接口分析（1）

在Android系统中，针对移动设备内存空间有限的特点，提供了一种在进程间共享数据的机制：匿名共享内存，它能够辅助内存管理系统来有效地管理内存，它的实现原理我们在前面已经分析过了。为了方便使用匿名共享内存机制，系统还提供了Java调用接口（MemoryFile）...

Android系统匿名共享内存（Anonymous Shared Memory）C++调用接口分析（4）

2. MemoryBase 文章开始时说过，MemoryBase接口是建立在MemoryHeapBase接口的基础上的，它们都可以作为一个Binder对象来在进程间进行数据共享，它们的关系如下所示： ...

Android系统匿名共享内存（Anonymous Shared Memory）C++调用接口分析（3）

回到前面BpMemoryHeap类中的assertMapped函数中，如果本BpMemoryHeap对象中的mHeapID等于-1，那么就说明这个BpMemoryHeap对象中的匿名共享内存还没准备就绪，因此，需要执行一次映射匿名共享内存的操作。 &...

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更新时间 2023-06-09 03:01:40

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