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diff --git a/portaudio/src/hostapi/coreaudio/pa_mac_core_blocking.h b/portaudio/src/hostapi/coreaudio/pa_mac_core_blocking.h
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+/*
+ * Internal blocking interfaces for PortAudio Apple AUHAL implementation
+ *
+ * PortAudio Portable Real-Time Audio Library
+ * Latest Version at: http://www.portaudio.com
+ *
+ * Written by Bjorn Roche of XO Audio LLC, from PA skeleton code.
+ * Portions copied from code by Dominic Mazzoni (who wrote a HAL implementation)
+ *
+ * Dominic's code was based on code by Phil Burk, Darren Gibbs,
+ * Gord Peters, Stephane Letz, and Greg Pfiel.
+ *
+ * The following people also deserve acknowledgements:
+ *
+ * Olivier Tristan for feedback and testing
+ * Glenn Zelniker and Z-Systems engineering for sponsoring the Blocking I/O
+ * interface.
+ *
+ *
+ * Based on the Open Source API proposed by Ross Bencina
+ * Copyright (c) 1999-2002 Ross Bencina, Phil Burk
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files
+ * (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge,
+ * publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
+ * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/*
+ * The text above constitutes the entire PortAudio license; however,
+ * the PortAudio community also makes the following non-binding requests:
+ *
+ * Any person wishing to distribute modifications to the Software is
+ * requested to send the modifications to the original developer so that
+ * they can be incorporated into the canonical version. It is also
+ * requested that these non-binding requests be included along with the
+ * license above.
+ */
+
+/**
+ @file
+ @ingroup hostapi_src
+*/
+
+#ifndef PA_MAC_CORE_BLOCKING_H_
+#define PA_MAC_CORE_BLOCKING_H_
+
+#include "pa_ringbuffer.h"
+#include "portaudio.h"
+#include "pa_mac_core_utilities.h"
+
+/*
+ * Number of milliseconds to busy wait while waiting for data in blocking calls.
+ */
+#define PA_MAC_BLIO_BUSY_WAIT_SLEEP_INTERVAL (5)
+/*
+ * Define exactly one of these blocking methods
+ * PA_MAC_BLIO_MUTEX is not actively maintained.
+ */
+#define PA_MAC_BLIO_BUSY_WAIT
+/*
+#define PA_MAC_BLIO_MUTEX
+*/
+
+typedef struct {
+    PaUtilRingBuffer inputRingBuffer;
+    PaUtilRingBuffer outputRingBuffer;
+    ring_buffer_size_t ringBufferFrames;
+    PaSampleFormat inputSampleFormat;
+    size_t inputSampleSizeActual;
+    size_t inputSampleSizePow2;
+    PaSampleFormat outputSampleFormat;
+    size_t outputSampleSizeActual;
+    size_t outputSampleSizePow2;
+
+    int inChan;
+    int outChan;
+
+    //PaStreamCallbackFlags statusFlags;
+    uint32_t statusFlags;
+    PaError errors;
+
+    /* Here we handle blocking, using condition variables. */
+#ifdef  PA_MAC_BLIO_MUTEX
+    volatile bool isInputEmpty;
+    pthread_mutex_t inputMutex;
+    pthread_cond_t inputCond;
+
+    volatile bool isOutputFull;
+    pthread_mutex_t outputMutex;
+    pthread_cond_t outputCond;
+#endif
+}
+PaMacBlio;
+
+/*
+ * These functions operate on condition and related variables.
+ */
+
+PaError initializeBlioRingBuffers(
+        PaMacBlio *blio,
+        PaSampleFormat inputSampleFormat,
+        PaSampleFormat outputSampleFormat,
+        long ringBufferSizeInFrames,
+        int inChan,
+        int outChan );
+PaError destroyBlioRingBuffers( PaMacBlio *blio );
+PaError resetBlioRingBuffers( PaMacBlio *blio );
+
+int BlioCallback(
+        const void *input, void *output,
+        unsigned long frameCount,
+        const PaStreamCallbackTimeInfo* timeInfo,
+        PaStreamCallbackFlags statusFlags,
+        void *userData );
+
+PaError waitUntilBlioWriteBufferIsEmpty( PaMacBlio *blio, double sampleRate,
+        size_t framesPerBuffer );
+
+#endif /*PA_MAC_CORE_BLOCKING_H_*/