SDL_AtomicU32.3type - Man Page

#include <SDL3/SDL_atomic.h>

typedef struct SDL_AtomicU32 { Uint32 value; } SDL_AtomicU32;

This can be used to manage a value that is synchronized across multiple CPUs without a race condition; when an app sets a value with SDL_SetAtomicU32 all other threads, regardless of the CPU it is running on, will see that value when retrieved with SDL_GetAtomicU32, regardless of CPU caches, etc.

This is also useful for atomic compare-and-swap operations: a thread can change the value as long as its current value matches expectations. When done in a loop, one can guarantee data consistency across threads without a lock (but the usual warnings apply: if you don't know what you're doing, or you don't do it carefully, you can confidently cause any number of disasters with this, so in most cases, you _should_ use a mutex instead of this!).

This is a struct so people don't accidentally use numeric operations on it directly. You have to use SDL atomic functions.

This struct is available since SDL 3.2.0.

SDL_CompareAndSwapAtomicU32(3), SDL_GetAtomicU32(3), SDL_SetAtomicU32(3)