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Commit 28f13513 authored by Glenn Kasten's avatar Glenn Kasten
Browse files

AudioRecord callback thread waits for priority boost 

Change-Id: Iae38fa4ac20a45751566169213a08a15deb0a2f6
parent f36dbfe3

include/media/AudioRecord.h

+1 −0
Original line number Diff line number Diff line
@@ -476,6 +476,7 @@ private: 


    int                     mPreviousPriority;  // before start()

    SchedPolicy             mPreviousSchedulingGroup;

    bool                    mAwaitBoost;    // thread should wait for priority boost before running



    // The proxy should only be referenced while a lock is held because the proxy isn't

    // multi-thread safe.

media/libmedia/AudioRecord.cpp

+20 −0
Original line number Diff line number Diff line
@@ -665,6 +665,26 @@ ssize_t AudioRecord::read(void* buffer, size_t userSize) 
nsecs_t AudioRecord::processAudioBuffer(const sp<AudioRecordThread>& thread)

{

    mLock.lock();

    if (mAwaitBoost) {

        mAwaitBoost = false;

        mLock.unlock();

        static const int32_t kMaxTries = 5;

        int32_t tryCounter = kMaxTries;

        uint32_t pollUs = 10000;

        do {

            int policy = sched_getscheduler(0);

            if (policy == SCHED_FIFO || policy == SCHED_RR) {

                break;

            }

            usleep(pollUs);

            pollUs <<= 1;

        } while (tryCounter-- > 0);

        if (tryCounter < 0) {

            ALOGE("did not receive expected priority boost on time");

        }

        // Run again immediately

        return 0;

    }



    // Can only reference mCblk while locked

    int32_t flags = android_atomic_and(~CBLK_OVERRUN, &mCblk->mFlags);