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(This is the legacy documentation for stable SDL2, the current stable version; SDL3 is the current development version.)


Locking for multi-threaded access to the joystick API


void SDL_LockJoysticks(void) SDL_ACQUIRE(SDL_joystick_lock);


If you are using the joystick API or handling events from multiple threads you should use these locking functions to protect access to the joysticks.

In particular, you are guaranteed that the joystick list won't change, so the API functions that take a joystick index will be valid, and joystick and game controller events will not be delivered.

As of SDL 2.26.0, you can take the joystick lock around reinitializing the joystick subsystem, to prevent other threads from seeing joysticks in an uninitialized state. However, all open joysticks will be closed and SDL functions called with them will fail.


This function is available since SDL 2.0.7.


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