SDL Wiki
(This is the documentation for SDL3, which is under heavy development and the API is changing! SDL2 is the current stable version!)


Wait until a condition variable is signaled.


int SDL_CondWait(SDL_cond *cond, SDL_mutex *mutex);

Function Parameters

cond the condition variable to wait on
mutex the mutex used to coordinate thread access

Return Value

Returns 0 when it is signaled or a negative error code on failure; call SDL_GetError() for more information.


This function unlocks the specified mutex and waits for another thread to call SDL_CondSignal() or SDL_CondBroadcast() on the condition variable cond. Once the condition variable is signaled, the mutex is re-locked and the function returns.

The mutex must be locked before calling this function. Locking the mutex recursively (more than once) is not supported and leads to undefined behavior.

This function is the equivalent of calling SDL_CondWaitTimeout() with a time length of SDL_MUTEX_MAXWAIT.


This function is available since SDL 3.0.0.

CategoryAPI, CategoryMutex

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