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/** @file patest_write_stop_threads.c
@brief Call Pa_StopStream() from another thread to see if PortAudio hangs.
@author Bjorn Roche of XO Audio (www.xoaudio.com)
@author Ross Bencina
@author Phil Burk
*/
/*
* $Id$
*
* This program uses the PortAudio Portable Audio Library.
* For more information see: http://www.portaudio.com/
* Copyright (c) 1999-2000 Ross Bencina and 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.
*/
#include <stdio.h>
#include <unistd.h>
#include <math.h>
#include <memory.h>
/* pthread may only be available on Mac and Linux. */
#include <pthread.h>
#include "portaudio.h"
#define SAMPLE_RATE (44100)
#define FRAMES_PER_BUFFER (2048)
static float s_buffer[FRAMES_PER_BUFFER][2]; /* stereo output buffer */
/**
* WARNING: PortAudio is NOT thread safe. DO NOT call PortAudio
* from multiple threads without synchronization. This test uses
* PA in an ILLEGAL WAY in order to try to flush out potential hang bugs.
* The test calls Pa_WriteStream() and Pa_StopStream() simultaneously
* from separate threads in order to try to cause Pa_StopStream() to hang.
* In the main thread we write to the stream in a loop.
* Then try stopping PA from another thread to see if it hangs.
*
* @note: Do not expect this test to pass. The test is only here
* as a debugging aid for hang bugs. Since this test uses PA in an
* illegal way, it may fail for reasons that are not PA bugs.
*/
/* Wait awhile then abort the stream. */
void *stop_thread_proc(void *arg)
{
PaStream *stream = (PaStream *)arg;
PaTime time;
for (int i = 0; i < 20; i++)
{
/* ILLEGAL unsynchronised call to PA, see comment above */
time = Pa_GetStreamTime( stream );
printf("Stream time = %f\n", time);
fflush(stdout);
usleep(100 * 1000);
}
printf("Call Pa_StopStream()\n");
fflush(stdout);
/* ILLEGAL unsynchronised call to PA, see comment above */
PaError err = Pa_StopStream( stream );
printf("Pa_StopStream() returned %d\n", err);
fflush(stdout);
return stream;
}
int main(void);
int main(void)
{
PaStreamParameters outputParameters;
PaStream *stream;
PaError err;
int result;
pthread_t thread;
printf( "PortAudio Test: output silence and stop from another thread. SR = %d, BufSize = %d\n",
SAMPLE_RATE, FRAMES_PER_BUFFER);
err = Pa_Initialize();
if( err != paNoError ) goto error;
outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */
outputParameters.channelCount = 2; /* stereo output */
outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */
outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultHighOutputLatency * 5;
outputParameters.hostApiSpecificStreamInfo = NULL;
/* open the stream */
err = Pa_OpenStream(
&stream,
NULL, /* no input */
&outputParameters,
SAMPLE_RATE,
FRAMES_PER_BUFFER,
paClipOff, /* we won't output out of range samples so don't bother clipping them */
NULL, /* no callback, use blocking API */
NULL ); /* no callback, so no callback userData */
if( err != paNoError ) goto error;
result = pthread_create(&thread, NULL /* attributes */, stop_thread_proc, stream);
/* start the stream */
err = Pa_StartStream( stream );
if( err != paNoError ) goto error;
/* clear buffer */
memset( s_buffer, 0, sizeof(s_buffer) );
/* play the silent buffer many times */
while( Pa_IsStreamActive(stream) > 0 )
{
err = Pa_WriteStream( stream, s_buffer, FRAMES_PER_BUFFER );
printf("Pa_WriteStream returns %d = %s\n", err, Pa_GetErrorText( err ));
if( err != paNoError )
{
err = paNoError;
break;
};
}
printf("Try to join the thread that called Pa_StopStream().\n");
result = pthread_join( thread, NULL );
printf("pthread_join returned %d\n", result);
/* close, and terminate */
printf("Call Pa_CloseStream\n");
err = Pa_CloseStream( stream );
if( err != paNoError ) goto error;
Pa_Terminate();
printf("Test finished.\n");
return err;
error:
Pa_Terminate();
fprintf( stderr, "An error occurred while using the portaudio stream\n" );
fprintf( stderr, "Error number: %d\n", err );
fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
return err;
}
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