(This is the documentation for SDL3, which is the current stable version. SDL2 was the previous version!)

SDL_Semaphore

A means to manage access to a resource, by count, between threads.

Header File

Defined in <SDL3/SDL_mutex.h>

Syntax

typedef struct SDL_Semaphore SDL_Semaphore;

Remarks

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:

https://en.wikipedia.org/wiki/Semaphore_(programming)

Version

This struct is available since SDL 3.1.3.

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CategoryAPI, CategoryAPIDatatype, CategoryMutex

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