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(This is the documentation for SDL3, which is under heavy development and the API is changing! SDL2 is the current stable version!)


Lock an audio stream for serialized access.

Header File

Defined in <SDL3/SDL_audio.h>


int SDL_LockAudioStream(SDL_AudioStream *stream);

Function Parameters

SDL_AudioStream * stream the audio stream to lock.

Return Value

(int) Returns 0 on success or a negative error code on failure; call SDL_GetError() for more information.


Each SDL_AudioStream has an internal mutex it uses to protect its data structures from threading conflicts. This function allows an app to lock that mutex, which could be useful if registering callbacks on this stream.

One does not need to lock a stream to use in it most cases, as the stream manages this lock internally. However, this lock is held during callbacks, which may run from arbitrary threads at any time, so if an app needs to protect shared data during those callbacks, locking the stream guarantees that the callback is not running while the lock is held.

As this is just a wrapper over SDL_LockMutex for an internal lock; it has all the same attributes (recursive locks are allowed, etc).

Thread Safety

It is safe to call this function from any thread.


This function is available since SDL 3.0.0.

See Also

CategoryAPI, CategoryAPIFunction, CategoryAudio

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