libfringe/tests/generator.rs

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// This file is part of libfringe, a low-level green threading library.
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// Copyright (c) whitequark <whitequark@whitequark.org>,
// edef <edef@edef.eu>
// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// http://opensource.org/licenses/MIT>, at your option. This file may not be
// copied, modified, or distributed except according to those terms.
extern crate fringe;
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use fringe::{Stack, SliceStack, OwnedStack, OsStack};
use fringe::generator::{Generator, Yielder};
fn add_one_fn<S: Stack>(yielder: &mut Yielder<i32, i32, S>, mut input: i32) {
loop {
if input == 0 { break }
input = yielder.suspend(input + 1)
}
}
fn new_add_one() -> Generator<i32, i32, OsStack> {
let stack = OsStack::new(0).unwrap();
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Generator::new(stack, add_one_fn)
}
#[test]
fn generator() {
let mut add_one = new_add_one();
assert_eq!(add_one.resume(1), Some(2));
assert_eq!(add_one.resume(2), Some(3));
assert_eq!(add_one.resume(0), None);
}
#[test]
fn move_after_new() {
let mut add_one = new_add_one();
assert_eq!(add_one.resume(1), Some(2));
#[inline(never)]
fn run_moved(mut add_one: Generator<i32, i32, OsStack>) {
assert_eq!(add_one.resume(2), Some(3));
assert_eq!(add_one.resume(3), Some(4));
assert_eq!(add_one.resume(0), None);
}
run_moved(add_one);
}
#[test]
#[should_panic]
fn panic_safety() {
struct Wrapper {
gen: Generator<(), (), OsStack>
}
impl Drop for Wrapper {
fn drop(&mut self) {
self.gen.resume(());
}
}
let stack = OsStack::new(4 << 20).unwrap();
let gen = Generator::new(stack, move |_yielder, ()| {
panic!("foo")
});
let mut wrapper = Wrapper { gen: gen };
wrapper.gen.resume(());
}
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#[test]
fn with_slice_stack() {
let mut memory = [0; 1024];
let stack = SliceStack(&mut memory);
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let mut add_one = unsafe { Generator::unsafe_new(stack, add_one_fn) };
assert_eq!(add_one.resume(1), Some(2));
assert_eq!(add_one.resume(2), Some(3));
}
#[test]
fn with_owned_stack() {
let stack = OwnedStack::new(1024);
let mut add_one = unsafe { Generator::unsafe_new(stack, add_one_fn) };
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assert_eq!(add_one.resume(1), Some(2));
assert_eq!(add_one.resume(2), Some(3));
}
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#[test]
fn forget_yielded() {
struct Dropper(*mut bool);
unsafe impl Send for Dropper {}
impl Drop for Dropper {
fn drop(&mut self) {
unsafe {
if *self.0 {
panic!("double drop!")
}
*self.0 = true;
}
}
}
let stack = fringe::OsStack::new(1<<16).unwrap();
let mut generator = Generator::new(stack, |yielder, ()| {
let mut flag = false;
yielder.suspend(Dropper(&mut flag as *mut bool));
});
generator.resume(());
generator.resume(());
}