###### (This is the legacy documentation for stable SDL2, the current stable version; [SDL3](https://wiki.libsdl.org/SDL3/) is the current development version.) # SDL_AtomicLock Lock a spin lock by setting it to a non-zero value. ## Syntax ```c void SDL_AtomicLock(SDL_SpinLock *lock); ``` ## Function Parameters | | | | ------------ | ---------------------------- | | **lock** | a pointer to a lock variable | ## Remarks ***Please note that spinlocks are dangerous if you don't know what you're doing. Please be careful using any sort of spinlock!*** ## Version This function is available since SDL 2.0.0. ## Related Functions * [SDL_AtomicTryLock](SDL_AtomicTryLock) * [SDL_AtomicUnlock](SDL_AtomicUnlock) ---- [CategoryAPI](CategoryAPI)