Merge "Fix dumpDebugInfo blocked and phone hanging"

    }

    std::string str;

    // Use other thread to read pipe to prevent

    // pipe is full, making HWC be blocked in writing.

    std::thread t([&]() {

        base::ReadFdToString(pipefds[0], &str);

    });

    const auto status = mAidlComposer->dump(pipefds[1], /*args*/ nullptr, /*numArgs*/ 0);

    // Close the write-end of the pipe to make sure that when reading from the

    // read-end we will get eof instead of blocking forever

    close(pipefds[1]);

    if (status == STATUS_OK) {

        base::ReadFdToString(pipefds[0], &str);

    } else {

    if (status != STATUS_OK) {

        ALOGE("dumpDebugInfo: dump failed: %d", status);

    }

    t.join();

    close(pipefds[0]);

    return str;

}