if (!data.restrictedBackupMode) {
        if (!ArrayUtils.isEmpty(data.providers)) {
          installContentProviders(app, data.providers);
        }
      }

final ArrayList<IActivityManager.ContentProviderHolder> results =
      new ArrayList<IActivityManager.ContentProviderHolder>();
    for (ProviderInfo cpi : providers) {
      IActivityManager.ContentProviderHolder cph = installProvider(context, null, cpi,
          false /*noisy*/, true /*noReleaseNeeded*/, true /*stable*/);
      if (cph != null) {
        cph.noReleaseNeeded = true;
        results.add(cph);
      }
    }
    try {
      ActivityManagerNative.getDefault().publishContentProviders(
        getApplicationThread(), results);
    } catch (RemoteException ex) {
    }

final java.lang.ClassLoader cl = c.getClassLoader();
        localProvider = (ContentProvider)cl.
          loadClass(info.name).newInstance();
        provider = localProvider.getIContentProvider();

for (String auth : auths) {
      final ProviderKey key = new ProviderKey(auth, userId);
      final ProviderClientRecord existing = mProviderMap.get(key);
      if (existing != null) {
      } else {
        mProviderMap.put(key, pcr);
      }
    }

final int N = providers.size();
      for (int i = 0; i < N; i++) {
        ContentProviderHolder src = providers.get(i);
        ...
        ContentProviderRecord dst = r.pubProviders.get(src.info.name);
        if (dst != null) {
          ComponentName comp = new ComponentName(dst.info.packageName, dst.info.name);
          mProviderMap.putProviderByClass(comp, dst);
          String names[] = dst.info.authority.split(";");
          for (int j = 0; j < names.length; j++) {
            mProviderMap.putProviderByName(names[j], dst);
          }
          int launchingCount = mLaunchingProviders.size();
          int j;
          boolean wasInLaunchingProviders = false;
          for (j = 0; j < launchingCount; j++) {
            if (mLaunchingProviders.get(j) == dst) {
              mLaunchingProviders.remove(j);
              wasInLaunchingProviders = true;
              j--;
              launchingCount--;
            }
          }
          if (wasInLaunchingProviders) {
            mHandler.removeMessages(CONTENT_PROVIDER_PUBLISH_TIMEOUT_MSG, r);
          }
          ...
        }
      }

if (record.singleton) {
      mSingletonByClass.put(name, record);
    } else {
      final int userId = UserHandle.getUserId(record.appInfo.uid);
      getProvidersByClass(userId).put(name, record);
    }

if (record.singleton) {
      mSingletonByName.put(name, record);
    } else {
      final int userId = UserHandle.getUserId(record.appInfo.uid);
      getProvidersByName(userId).put(name, record);
    }

context.getContentResolver().query(uri, ...);
 public ContentResolver getContentResolver() {
    return mContentResolver;
  }

mContentResolver = new ApplicationContentResolver(this, mainThread, user);

IContentProvider provider = acquireProvider(url);
    if (provider == null) {
      throw new IllegalArgumentException("Unknown URL " + url);
    }
    try {
      long startTime = SystemClock.uptimeMillis();
      Uri createdRow = provider.insert(mPackageName, url, values);
      ...
      return createdRow;
    } catch (RemoteException e) {
      return null;
    } finally {
      releaseProvider(provider);
    }

if (!SCHEME_CONTENT.equals(uri.getScheme())) {
      return null;
    }
    final String auth = uri.getAuthority();
    if (auth != null) {
      return acquireProvider(mContext, auth);
    }

protected IContentProvider acquireProvider(Context context, String auth) {
      return mMainThread.acquireProvider(context,
          ContentProvider.getAuthorityWithoutUserId(auth),
          resolveUserIdFromAuthority(auth), true);
    }

 final IContentProvider provider = acquireExistingProvider(c, auth, userId, stable);
    if (provider != null) {
      return provider;
    }

    IActivityManager.ContentProviderHolder holder = null;
    try {
      holder = ActivityManagerNative.getDefault().getContentProvider(
          getApplicationThread(), auth, userId, stable);
    } catch (RemoteException ex) {
    }
    if (holder == null) {
      return null;
    }

    holder = installProvider(c, holder, holder.info,
        true /*noisy*/, holder.noReleaseNeeded, stable);
    return holder.provider;

synchronized (mProviderMap) {
      final ProviderKey key = new ProviderKey(auth, userId);
      final ProviderClientRecord pr = mProviderMap.get(key);
      if (pr == null) {
        return null;
      }
      IContentProvider provider = pr.mProvider;
      IBinder jBinder = provider.asBinder();
      ...
      ProviderRefCount prc = mProviderRefCountMap.get(jBinder);
      if (prc != null) {
        incProviderRefLocked(prc, stable);
      }
      return provider;

ContentProviderRecord cpr;
cpr = mProviderMap.getProviderByName(name, userId);
if (providerRunning){
  if (r != null && cpr.canRunHere(r)) {
          ContentProviderHolder holder = cpr.newHolder(null);
          holder.provider = null;
          return holder;
        }
}

 public boolean canRunHere(ProcessRecord app) {
    return (info.multiprocess || info.processName.equals(app.processName))
        && uid == app.info.uid;
  }

if (!providerRunning) {
      cpi = AppGlobals.getPackageManager().resolveContentProvider(name,
          STOCK_PM_FLAGS | PackageManager.GET_URI_PERMISSION_PATTERNS, userId);
      ...
      ComponentName comp = new ComponentName(cpi.packageName, cpi.name);
      cpr = mProviderMap.getProviderByClass(comp, userId);
      if (r != null && cpr.canRunHere(r)) {
        return cpr.newHolder(null);
      }
      ProcessRecord proc = getProcessRecordLocked(
              cpi.processName, cpr.appInfo.uid, false);

          if (proc != null && proc.thread != null) {
            if (!proc.pubProviders.containsKey(cpi.name)) {
              proc.pubProviders.put(cpi.name, cpr);
              proc.thread.scheduleInstallProvider(cpi);
            }
          } else {
            proc = startProcessLocked(cpi.processName,
                cpr.appInfo, false, 0, "content provider",
                new ComponentName(cpi.applicationInfo.packageName,
                    cpi.name), false, false, false);
          }
        } 
      }
      mProviderMap.putProviderByName(name, cpr);
    }

private IActivityManager.ContentProviderHolder installProvider(Context context,
      IActivityManager.ContentProviderHolder holder, ProviderInfo info,
      boolean noisy, boolean noReleaseNeeded, boolean stable)

ContentProvider localProvider = null;
    IContentProvider provider;
    if (holder == null || holder.provider == null) {
      try {
        final java.lang.ClassLoader cl = c.getClassLoader();
        localProvider = (ContentProvider)cl.
          loadClass(info.name).newInstance();
        provider = localProvider.getIContentProvider();
        if (provider == null) {
          return null;
        }
        localProvider.attachInfo(c, info);
      } catch (java.lang.Exception e) {
      }
    } else {
      provider = holder.provider;
    }

IActivityManager.ContentProviderHolder retHolder;
    synchronized (mProviderMap) {
      IBinder jBinder = provider.asBinder();
      if (localProvider != null) {
        ComponentName cname = new ComponentName(info.packageName, info.name);
        ProviderClientRecord pr = mLocalProvidersByName.get(cname);
        if (pr != null) {
          provider = pr.mProvider;
        } else {
          holder = new IActivityManager.ContentProviderHolder(info);
          holder.provider = provider;
          holder.noReleaseNeeded = true;
          pr = installProviderAuthoritiesLocked(provider, localProvider, holder);
          mLocalProviders.put(jBinder, pr);
          mLocalProvidersByName.put(cname, pr);
        }
        retHolder = pr.mHolder;
      } else {
        ...
      }

IActivityManager.ContentProviderHolder retHolder;
    synchronized (mProviderMap) {
      ...
      } else {
        ProviderRefCount prc = mProviderRefCountMap.get(jBinder);
        if (prc != null) {
          if (!noReleaseNeeded) {
            incProviderRefLocked(prc, stable);
            try {
              ActivityManagerNative.getDefault().removeContentProvider(
                  holder.connection, stable);
            } 
          }
        } else {
          ProviderClientRecord client = installProviderAuthoritiesLocked(
              provider, localProvider, holder);
          if (noReleaseNeeded) {
            prc = new ProviderRefCount(holder, client, 1000, 1000);
          } else {
            prc = stable
                ? new ProviderRefCount(holder, client, 1, 0)
                : new ProviderRefCount(holder, client, 0, 1);
          }
          mProviderRefCountMap.put(jBinder, prc);
        }
        retHolder = prc.holder;
      }