SDL_SignalCondition(3)

💖 SDL_SignalCondition 💖

okay bestie, welcome to another episode of me explaining SDL mutex lore to you at 2am 🦋 this one's a function from the SDL3 family, and honestly? it's giving "small but mighty". the manual page you're reading is SDL_SignalCondition(3) and yes we're gonna get into it 💅

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✨ NAME ✨

SDL_SignalCondition — wake up one of the threads that's out here waiting on the condition variable. just one. singular. a lil tap on the shoulder, not a group scream 🌸

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✨ SYNOPSIS ✨

#include <SDL3/SDL_mutex.h>

void SDL_SignalCondition(SDL_Condition *cond);

that's it, that's the whole vibe. no return value, she just does the thing ✨

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✨ FUNCTION PARAMETERS ✨

• cond — the condition variable you wanna signal. the one you're poking. the main character of this whole operation 👑

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✨ THREAD SAFETY ✨

okay this is the part where I hold your hand: it is safe to call this function from any thread. literally any of them. no "um actually you need to be on the right thread" nonsense, no cap 💯

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✨ AVAILABILITY ✨

this one has been around since SDL 3.2.0, so if you're on anything older... bestie, she does not exist yet 😭 upgrade era 🧚

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✨ SEE ALSO ✨

the whole friend group, for your browsing pleasure:

• SDL_BroadcastCondition(3) — when you want to wake everybody up instead. chaos mode 🌈
• SDL_WaitCondition(3) — the waiting side of this situationship
• SDL_WaitConditionTimeout(3) — same but with a lil timer, so you're not waiting forever ⏰

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reminder bestie: this signals one thread. if you meant to wake the whole crowd, you want SDL_BroadcastCondition, and there's a whole separate page for that. don't be out here accidentally being exclusive when you meant to throw a party 🎀

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mwah that's the page!! brought to you by Simple Directmedia Layer, living in SDL 3.4.18 — thank u for reading, go signal your condition variable, she's been waiting 🫶💜