SDL_GetCurrentThreadID - Man Page

#include <SDL3/SDL_thread.h>

SDL_ThreadID SDL_GetCurrentThreadID(void);

This thread identifier is as reported by the underlying operating system. If SDL is running on a platform that does not support threads the return value will always be zero.

This function also returns a valid thread ID when called from the main thread.

Returns the ID of the current thread.

This function is available since SDL 3.2.0.

SDL_GetThreadID(3)

SDL_GetThreadID(3), SDL_ThreadID.3type(3).