We have collected the most relevant information on Portaudio Callback Priority. Open the URLs, which are collected below, and you will find all the info you are interested in.
PortAudio - an Open-Source Cross-Platform Audio API
http://www.portaudio.com/faq.html#:~:text=We%20do%20not%20recommend%20doing%20file%20I%2FO%20in,%28%29%20for%20doing%20stream%20I%2FO%20though%20a%20FIFO.
[Portaudio] Allow tweaking PA callback thread scheduler ...
https://portaudio.music.columbia.narkive.com/LdhaG1PP/allow-tweaking-pa-callback-thread-scheduler-and-priority
The default PortAudio real-time scheduling was being set to SCHED_FIFO at a priority of 1. To work around the issue, I changed the PortAudio callback thread to use the SCHED_RR scheduler and the highest priority. Now the audio stream does not get interrupted. The attached patch shows what I did. It is based on code from PortAudio SVN rev 1919
PortAudio: Writing a Callback Function
http://www.portaudio.com/docs/v19-doxydocs/writing_a_callback.html
Windows amd Mac OS schedulers have no real-time safe priority inversion prevention. Other platforms require special mutex flags. In addition, it is not safe to call any PortAudio API functions in the callback except as explicitly permitted in the documentation.
PortAudio - an Open-Source Cross-Platform Audio API
http://www.portaudio.com/faq.html
We do not recommend doing file I/O in the PortAudio callback because the callback is run at a very high priority. We recommend reading the data in a normal priority thread then writing it to a FIFO which is read by the PortAudio callback. V19 has special functions called Pa_WriteStream () and Pa_ReadStream () for doing stream I/O though a FIFO.
c++ - Portaudio Callback Function Example - Stack Overflow
https://stackoverflow.com/questions/26172522/portaudio-callback-function-example
Many apps may want to use paFramesPerBufferUnspecified, which tells PortAudio to pick the best, possibly changing, buffer size.*/ patestCallback, /* this is your callback function */ &paData ); /*This is a pointer that will be passed to your callback*/. An example of a good callback function would be very useful, but of course any help is ...
PortAudio: portaudio.h File Reference
http://portaudio.com/docs/v19-doxydocs/portaudio_8h.html
The PortAudio stream callback runs at very high or real-time priority. It is required to consistently meet its time deadlines. Do not allocate memory, access the file system, call library functions or call other functions from the stream callback that may block or take an unpredictable amount of time to complete.
PortAudio - an Open-Source Cross-Platform Audio API
PortAudio provides a very simple API for recording and/or playing sound using a simple callback function or a blocking read/write interface. Example programs are included that play sine waves, process audio input (guitar fuzz), record and playback audio, list available audio devices, etc.
PortAudio: Blocking Read/Write Functions
http://portaudio.com/docs/v19-doxydocs/blocking_read_write.html
PortAudio V19 adds a huge advance over previous versions with a feature called Blocking I/O. Although it may have lower performance that the callback method described earlier in this tutorial, blocking I/O is easier to understand and is, in some cases, more compatible with third party systems than the callback method.
Now you know Portaudio Callback Priority
Now that you know Portaudio Callback Priority, we suggest that you familiarize yourself with information on similar questions.
