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Commit 8c0417c1 authored by Haynes Mathew George's avatar Haynes Mathew George Committed by Chris Elliott
Browse files

audio: prevent larger than required sleeps - DO NOT MERGE 

b/17962037

From: Haynes Mathew George <hgeorge@codeaurora.org>
Date: Wed, 26 Mar 2014 16:18:42 -0700
Subject: [PATCH] AudioTrack: prevent larger than required sleeps

AudioTrackThread can end up waiting for larger than necessary
time for free space to be available in the cblk. Fix this by
waiting on the cblk futex instead of the (internal) condition variable.

Change-Id: I75bd14cd46f3b75afe0ea8bd9b48d7a2f95f654a
parent e6b5d4c2

media/libmedia/AudioTrack.cpp

+21 −1
Original line number Diff line number Diff line
@@ -18,15 +18,21 @@ 


//#define LOG_NDEBUG 0

#define LOG_TAG "AudioTrack"

#define ATRACE_TAG ATRACE_TAG_AUDIO



#include <sys/resource.h>

#include <audio_utils/primitives.h>

#include <binder/IPCThreadState.h>

#include <media/AudioTrack.h>

#include <utils/Log.h>

#include <utils/Trace.h>

#include <private/media/AudioTrackShared.h>

#include <media/IAudioFlinger.h>



extern "C" {

#include "../private/bionic_futex.h"

}



#define WAIT_PERIOD_MS                  10

#define WAIT_STREAM_END_TIMEOUT_SEC     120
@@ -1606,7 +1612,21 @@ nsecs_t AudioTrack::processAudioBuffer(const sp<AudioTrackThread>& thread) 
                if (ns < 0 || myns < ns) {

                    ns = myns;

                }

                return ns;

                int32_t old = android_atomic_and(~CBLK_FUTEX_WAKE, &mCblk->mFutex);

                char str[64] = {0};

                struct timespec ts;



                snprintf(str, sizeof(str), "futex_wait timeout %lld Us", ns/1000LL);



                ATRACE_BEGIN(str);

                ts.tv_sec = 0;

                ts.tv_nsec = ns;

                // wait for max ns allowing server to wake us up if possible

                int ret = __futex_syscall4(&mCblk->mFutex,

                                           FUTEX_WAIT,

                                           old & ~CBLK_FUTEX_WAKE, &ts);

                ATRACE_END();

                return 0; //retry immediately as space (possibly) became available

            }

        }