Android sharedmemory分析的相关内容

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...

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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。 &...

Android系统匿名共享内存（Anonymous Shared Memory）C++调用接口分析（5）

下面我们再来看MemoryBase类在Client端的实现，同样，先看它们的类图关系：这个图中我们可以看出，MemoryBase类在Client端的实现与MemoryHeapBase类在Client端的实现是类似的，这里只要把IMemory类换成IMemor...

Android系统匿名共享内存（Anonymous Shared Memory）C++调用接口分析（7）

同样，我们需要为这个Client端应用程序编译一个编译脚本，在external/ashmem/client目录下，新建一个Android.mk文件，它的内容如下所示： LOCAL_PATH := $(c...

Android系统匿名共享内存（Anonymous Shared Memory）C++调用接口分析（2）

回到前面MemoryHeapBase类的构造函数中，将匿名共享内存映射到本进程的地址空间去后，还看继续设置这块匿名共享内存的读写属性： if (fd >= 0) { &n...

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

在上一文章Android系统匿名共享内存Ashmem（Anonymous Shared Memory）简要介绍和学习计划中，我们简要介绍了Android系统的匿名共享内存机制，其中，简要提到了它具有辅助内存管理系统来有效地管理内存的特点，但是没有进一步去了解它是如何实现的。在本文中，我们将通过分析A...

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