SDL_Semaphore.3type - Man Page
A means to manage access to a resource, by count, between threads.
Synopsis
#include <SDL3/SDL_mutex.h> typedef struct SDL_Semaphore SDL_Semaphore;
Description
Semaphores (specifically, "counting semaphores"), let X number of threads request access at the same time, each thread granted access decrementing a counter. When the counter reaches zero, future requests block until a prior thread releases their request, incrementing the counter again.
Wikipedia has a thorough explanation of the concept:
Availability
This struct is available since SDL 3.2.0.
Info
SDL 3.2.20 Simple Directmedia Layer SDL3 DATATYPES