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libfringe/benches/context_new.rs

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Rust
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#![feature(test)]
extern crate test;
extern crate lwkt;
use lwkt::{Context, Stack};
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static mut ctx_slot: *mut Context<SliceStack<'static>> = 0 as *mut Context<_>;
static mut stack_buf: [u8; 1024] = [0; 1024];
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#[bench]
fn context_new(b: &mut test::Bencher) {
b.iter(|| unsafe {
let stack = SliceStack(&mut stack_buf);
let mut ctx = Context::new(stack, move || {
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let ctx_ptr = ctx_slot;
loop {
(*ctx_ptr).swap()
}
});
ctx_slot = &mut ctx;
ctx.swap();
})
}
struct SliceStack<'a>(&'a mut [u8]);
impl<'a> lwkt::Stack for SliceStack<'a> {
fn top(&mut self) -> *mut u8 {
unsafe {
self.0.as_mut_ptr().offset(self.0.len() as isize)
}
}
fn limit(&self) -> *const u8 {
self.0.as_ptr()
}
}