forked from M-Labs/libfringe
138 lines
3.5 KiB
Rust
138 lines
3.5 KiB
Rust
// This file is part of libfringe, a low-level green threading library.
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// Copyright (c) whitequark <whitequark@whitequark.org>,
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// edef <edef@edef.eu>
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// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
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// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
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// http://opensource.org/licenses/MIT>, at your option. This file may not be
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// copied, modified, or distributed except according to those terms.
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extern crate fringe;
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use fringe::{SliceStack, OwnedStack, OsStack};
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use fringe::generator::{Generator, Yielder};
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fn add_one_fn(yielder: &Yielder<i32, i32>, mut input: i32) {
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loop {
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if input == 0 { break }
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input = yielder.suspend(input + 1)
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}
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}
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fn new_add_one() -> Generator<'static, i32, i32, OsStack> {
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let stack = OsStack::new(0).unwrap();
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Generator::new(stack, add_one_fn)
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}
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#[test]
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fn generator() {
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let mut add_one = new_add_one();
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assert_eq!(add_one.resume(1), Some(2));
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assert_eq!(add_one.resume(2), Some(3));
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assert_eq!(add_one.resume(0), None);
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}
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#[test]
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fn move_after_new() {
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let mut add_one = new_add_one();
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assert_eq!(add_one.resume(1), Some(2));
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#[inline(never)]
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fn run_moved(mut add_one: Generator<i32, i32, OsStack>) {
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assert_eq!(add_one.resume(2), Some(3));
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assert_eq!(add_one.resume(3), Some(4));
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assert_eq!(add_one.resume(0), None);
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}
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run_moved(add_one);
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}
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#[test]
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#[should_panic]
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fn panic_safety() {
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struct Wrapper {
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gen: Generator<'static, (), (), OsStack>
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}
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impl Drop for Wrapper {
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fn drop(&mut self) {
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self.gen.resume(());
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}
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}
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let stack = OsStack::new(4 << 20).unwrap();
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let gen = Generator::new(stack, move |_yielder, ()| {
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panic!("foo")
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});
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let mut wrapper = Wrapper { gen: gen };
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wrapper.gen.resume(());
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}
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#[test]
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fn with_slice_stack() {
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let mut memory = [0; 1024];
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let stack = SliceStack::new(&mut memory);
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let mut add_one = unsafe { Generator::unsafe_new(stack, add_one_fn) };
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assert_eq!(add_one.resume(1), Some(2));
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assert_eq!(add_one.resume(2), Some(3));
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assert_eq!(add_one.resume(0), None);
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}
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#[test]
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fn with_owned_stack() {
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let stack = OwnedStack::new(1024);
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let mut add_one = unsafe { Generator::unsafe_new(stack, add_one_fn) };
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assert_eq!(add_one.resume(1), Some(2));
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assert_eq!(add_one.resume(2), Some(3));
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assert_eq!(add_one.resume(0), None);
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}
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#[test]
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fn forget_yielded() {
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use std::cell::Cell;
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struct Dropper<'a>(&'a Cell<bool>);
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impl<'a> Drop for Dropper<'a> {
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fn drop(&mut self) {
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if self.0.get() {
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panic!("double drop!")
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}
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self.0.set(true);
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}
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}
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let stack = fringe::OsStack::new(1<<16).unwrap();
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let flag = Cell::new(false);
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let mut generator = Generator::new(stack, |yielder, ()| {
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yielder.suspend(Dropper(&flag));
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});
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generator.resume(());
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generator.resume(());
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}
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#[test]
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fn unwrap_returned() {
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let stack = OsStack::new(0).unwrap();
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let mut generator = Generator::new(stack, |_, ()| {});
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assert_eq!(generator.resume(()), None::<()>);
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generator.unwrap();
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}
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#[test]
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fn unwrap_panicked() {
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use std::panic;
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let stack = OsStack::new(4 << 20).unwrap();
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let mut generator: Generator<(), (), OsStack> = Generator::new(stack, |_, ()| panic!("unwind"));
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{
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let closure = panic::AssertUnwindSafe(|| generator.resume(()));
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assert!(panic::catch_unwind(closure).is_err());
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}
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generator.unwrap();
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}
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#[test]
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#[should_panic(expected = "Argh! Bastard! Don't touch that!")]
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fn unwrap_running() {
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let mut add_one = new_add_one();
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assert_eq!(add_one.resume(1), Some(2));
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add_one.unwrap();
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}
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