Sunday nothingburger for you: iPhone 18 Pro Max has a "Prepare to Ship" feature which intentionally discharges the 20 Wh battery. /usr/libexec/BatteryDischargeService handles this by calling [[NSProcessInfo processInfo] activeProcessorCount] and spawning that many NSThreads that spin until stopped
![Screenshot of Binary Ninja decompilation output:
void worker_thread_work(void* closure_data @ x20)
{
void* closure_data_1 = closure_data;
int64_t closure_data__ofs0 = data_100014f98;
if (!((uint32_t)*(uint8_t*)((char*)closure_data + closure_data__ofs0) & 1))
return;
int64_t iterations = 1;
while (true)
{
if (iterations / 1000000 * 1000000 == iterations)
{
id current_thread = [[[NSThread self] currentThread] retain];
int32_t is_cancelled = [current_thread isCancelled];
_objc_release_x19(current_thread);
if (is_cancelled & 1)
break;
}
if (!((uint32_t)*(uint8_t*)((char*)closure_data + closure_data__ofs0) & 1))
break;
bool did_overflow = iterations + 1;
iterations += 1;
if (did_overflow)
trap(1);
}
}](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:ot2275o5meirgxt2tyaziagh/bafkreientovjndwtnb4bymgxjdygdmyekrxlsv42kycx56a6emr6cvbeei)
![Code:
import {run, useConstraints} from 'capstone';
import {useReducer} from 'react';
function App() {
const [counter, increment] = useReducer((count) => count + 1, 0);
function handleClick() {
console.log(':3');
increment();
}
const views = useConstraints((c) => ({
container: {width: c.gte(300), height: c.gte(200)},
button: {},
}));
return (
<window title='hello, capstone'>
<view ref={views.container}>
<button ref={views.button} onClick={handleClick}>
{String(counter)}
</button>
</view>
<constraint let={views.button.centerX} eq={views.container.centerX} />
<constraint let={views.button.centerY} eq={views.container.centerY} />
</window>
);
}
run(<App />);
A native macOS window is shown off to the side, with a button that reads "5".](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:ot2275o5meirgxt2tyaziagh/bafkreicnc7s7hpts5yemrg2pu4ziiy2xwt6bkoehpvu3jbz4zezm7kdjdy)
![next.js config with basically all of the experimental stuff turned on
experimental: {
optimizePackageImports: ["@slicey/silk"],
reactCompiler: true,
serverComponentsHmrCache: true,
dynamicIO: true,
ppr: true,
typedRoutes: true,
typedEnv: true,
},](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:ot2275o5meirgxt2tyaziagh/bafkreid2j3fqudiwfpgw7hinqjvd3ukagby4mfdiwrqj7uo2ehskzd7axi)
