36 lines
1 KiB
Rust
36 lines
1 KiB
Rust
use std::future::Future;
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use std::pin::Pin;
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use std::ptr;
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use std::task::{Context, Poll, RawWaker, RawWakerVTable, Waker};
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// Executor for a future that resolves immediately (test only).
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#[allow(clippy::missing_panics_doc)]
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pub fn block_on_simple<F: Future>(mut fut: F) -> F::Output {
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unsafe fn clone(_null: *const ()) -> RawWaker {
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unimplemented!()
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}
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unsafe fn wake(_null: *const ()) {
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unimplemented!()
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}
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unsafe fn wake_by_ref(_null: *const ()) {
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unimplemented!()
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}
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unsafe fn drop(_null: *const ()) {}
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let data = ptr::null();
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let vtable = &RawWakerVTable::new(clone, wake, wake_by_ref, drop);
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let raw_waker = RawWaker::new(data, vtable);
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let waker = unsafe { Waker::from_raw(raw_waker) };
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let mut cx = Context::from_waker(&waker);
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// fut does not move until it gets dropped.
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let fut = unsafe { Pin::new_unchecked(&mut fut) };
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match fut.poll(&mut cx) {
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Poll::Ready(output) => output,
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Poll::Pending => panic!("future did not resolve immediately"),
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}
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}
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