N service创建

M之前版本在一个进程中创建media相关所有服务

av/media/mediaserver/main_mediaserver.cpp        

        sp<IServiceManager> sm = defaultServiceManager();         ALOGI("ServiceManager: %p", sm.get());         AudioFlinger::instantiate();         MediaPlayerService::instantiate();         ResourceManagerService::instantiate();         CameraService::instantiate();         AudioPolicyService::instantiate();         SoundTriggerHwService::instantiate();         RadioService::instantiate();         registerExtensions();         ProcessState::self()->startThreadPool();         IPCThreadState::self()->joinThreadPool();

N版本将各个服务转移到不同进程中进行创建

media/audioserver/main_audioserver.cpp:        AudioPolicyService::instantiate(); camera/cameraserver/main_cameraserver.cpp:    CameraService::instantiate(); media/mediaserver/main_mediaserver.cpp:    MediaPlayerService::instantiate();