From 28f1351369682801e1bb40a835bdae3c97b73c1c Mon Sep 17 00:00:00 2001
From: Glenn Kasten <gkasten@google.com>
Date: Wed, 31 Jul 2013 12:27:26 -0700
Subject: AudioRecord callback thread waits for priority boost

Change-Id: Iae38fa4ac20a45751566169213a08a15deb0a2f6
---
 media/libmedia/AudioRecord.cpp | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

(limited to 'media/libmedia/AudioRecord.cpp')

diff --git a/media/libmedia/AudioRecord.cpp b/media/libmedia/AudioRecord.cpp
index 0e7e17f..7be7529 100644
--- a/media/libmedia/AudioRecord.cpp
+++ b/media/libmedia/AudioRecord.cpp
@@ -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);
-- 
cgit v1.1