From 70e571fed97fda762cfe941b6ee693ba5f614a2b Mon Sep 17 00:00:00 2001
From: Chris Moeller <kode54@gmail.com>
Date: Sun, 13 Oct 2013 05:59:19 -0700
Subject: [PATCH] Now handling a race condition where the buffer is emptied
 between where it is read and where it is told how much has been read from it

---
 Audio/ThirdParty/VirtualRingBuffer/VirtualRingBuffer.m | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/Audio/ThirdParty/VirtualRingBuffer/VirtualRingBuffer.m b/Audio/ThirdParty/VirtualRingBuffer/VirtualRingBuffer.m
index 421a9570c..cdfeb4105 100644
--- a/Audio/ThirdParty/VirtualRingBuffer/VirtualRingBuffer.m
+++ b/Audio/ThirdParty/VirtualRingBuffer/VirtualRingBuffer.m
@@ -69,7 +69,7 @@ static void deallocateVirtualBuffer(void *buffer, UInt32 bufferLength);
 
 - (BOOL)isEmpty
 {
-    return (readPointer != NULL && writePointer != NULL);
+    return (readPointer == NULL && writePointer == NULL);
 }
 
 
@@ -127,6 +127,12 @@ static void deallocateVirtualBuffer(void *buffer, UInt32 bufferLength);
     void *newReadPointer;
 
     newReadPointer = readPointer + length;
+    
+    if (newReadPointer == (void *)(intptr_t) length) {
+        // Someone somehow read from us before another thread emptied the buffer
+        newReadPointer = NULL;
+    }
+    
     if (newReadPointer >= bufferEnd)
         newReadPointer -= bufferLength;