Merge "Revert "AudioFlinger: Boost priority on a separate thread"" into main

#include <utils/Trace.h>

#include <fcntl.h>

#include <future>

#include <linux/futex.h>

#include <math.h>

#include <memory>

{

    aflog::setThreadWriter(mNBLogWriter.get());

    std::future<void> priorityBoostFuture; // joined on dtor; this is a one-shot boost.

    if (mType == SPATIALIZER) {

        const pid_t tid = getTid();

        if (tid == -1) {  // odd: we are here, we must be a running thread.

            ALOGW("%s: Cannot update Spatializer mixer thread priority, no tid", __func__);

        } else {

            // We launch the priority boost request in a separate thread because

            // the SchedulingPolicyService may not be available during early

            // boot time, with a wait causing boot delay.

            // There is also a PrioConfigEvent that does this, but it will also

            // block other config events.  This command should be able

            // to run concurrent with other stream commands.

            priorityBoostFuture = std::async(std::launch::async,

                    [tid, output_sp = stream()]() {

            const int priorityBoost = requestSpatializerPriority(getpid(), tid);

            if (priorityBoost > 0) {

                    output_sp->setHalThreadPriority(priorityBoost);

                stream()->setHalThreadPriority(priorityBoost);

            }

            });

        }

    }