作用
管理资源(Resource), 应用添加和移除资源时通知到 Service.
资源紧张时, 将根据优先级释放资源.
释放资源通过 IResourceManagerClient.reclaimResource 通知应用进行释放
启动时机
在 mediaserver 初始化时启动,并且被添加到 Service Manager 中
1.0 在 meida server 的 main 函数中实例化对象
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// frameworks/av/media/mediaserver/main_mediaserver.cpp int main(int argc __unused, char **argv __unused) { ... ResourceManagerService::instantiate();// 见 2.0 ... } |
2.0 ResourceManagerService::instantiate
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// frameworks/av/services/mediaresourcemanager/ResourceManagerService.cpp void ResourceManagerService::instantiate() { // 调用空构造参数的构造函数 见 3.0 std::shared_ptr<ResourceManagerService> service = ::ndk::SharedRefBase::make<ResourceManagerService>(); // 添加到系统 service manager binder_status_t status = AServiceManager_addService(service->asBinder().get(), getServiceName());// getServiceName 返回 media.resource_manager if (status != STATUS_OK) { return; } // TODO: mediaserver main() is already starting the thread pool, // move this to mediaserver main() when other services in mediaserver // are converted to ndk-platform aidl. //ABinderProcess_startThreadPool(); } |
3.0 ResourceManagerService::ResourceManagerService
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// frameworks/av/services/mediaresourcemanager/ResourceManagerService.cpp ResourceManagerService::ResourceManagerService() : ResourceManagerService(new ProcessInfo(), new SystemCallbackImpl()) {} ResourceManagerService::ResourceManagerService( const sp<ProcessInfoInterface> &processInfo, const sp<SystemCallbackInterface> &systemResource) : mProcessInfo(processInfo), mSystemCB(systemResource), mServiceLog(new ServiceLog()), mSupportsMultipleSecureCodecs(true), mSupportsSecureWithNonSecureCodec(true), mCpuBoostCount(0), mDeathRecipient(AIBinder_DeathRecipient_new(DeathNotifier::BinderDiedCallback)) { mSystemCB->noteResetVideo(); } |
提供的接口
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// frameworks/av/media/libmedia/aidl/android/media/IResourceManagerService.aidl interface IResourceManagerService { /** * Configure the ResourceManagerService to adopted particular policies when * managing the resources. * * @param policies an array of policies to be adopted. */ void config(in MediaResourcePolicyParcel[] policies); /** * Add a client to a process with a list of resources. * * @param pid pid of the client. * @param uid uid of the client. * @param clientId an identifier that uniquely identifies the client within the pid. * @param client interface for the ResourceManagerService to call the client. * @param resources an array of resources to be added. */ void addResource( int pid, int uid, long clientId, IResourceManagerClient client, in MediaResourceParcel[] resources); /** * Remove the listed resources from a client. * * @param pid pid from which the list of resources will be removed. * @param clientId clientId within the pid from which the list of resources will be removed. * @param resources an array of resources to be removed from the client. */ void removeResource(int pid, long clientId, in MediaResourceParcel[] resources); /** * Remove all resources from a client. * * @param pid pid from which the client's resources will be removed. * @param clientId clientId within the pid that will be removed. */ void removeClient(int pid, long clientId); /** * Tries to reclaim resource from processes with lower priority than the * calling process according to the requested resources. * * @param callingPid pid of the calling process. * @param resources an array of resources to be reclaimed. * * @return true if the reclaim was successful and false otherwise. */ boolean reclaimResource(int callingPid, in MediaResourceParcel[] resources); /** * Override the pid of original calling process with the pid of the process * who actually use the requested resources. * * @param originalPid pid of the original calling process. * @param newPid pid of the actual process who use the resources. * remove existing override on originalPid if newPid is -1. */ void overridePid(int originalPid, int newPid); /** * Mark a client for pending removal * * @param pid pid from which the client's resources will be removed. * @param clientId clientId within the pid that will be removed. */ void markClientForPendingRemoval(int pid, long clientId); /** * Reclaim resources from clients pending removal, if any. * * @param pid pid from which resources will be reclaimed. */ void reclaimResourcesFromClientsPendingRemoval(int pid); } |
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