// Vectors are allocated in the Rust kernel's memory region, use of
// which requires some amount of synchronization. This test exercises
// that synchronization by spawning a number of tasks and then
// allocating and freeing vectors.

use std;
import std::vec;
import std::uint;
import std::istr;
import std::task;

fn f(n: uint) {
    for each i in uint::range(0u, n) {
        let v: [u8] = [];
        vec::reserve(v, 1000u);
    }
}

fn main(args: [istr]) {
    let n = if vec::len(args) < 2u {
        100u
    } else {
        uint::parse_buf(istr::bytes(args[1]), 10u)
    };
    for each i in uint::range(0u, 100u) {
        task::spawn(bind f(n));
    }
}
Add a benchmark for cross-task kernel memory region synchronization
Add a benchmark for cross-task kernel memory region synchronization

Vectors are allocated from the kernel's memory region, which has some heinous
synchronization. This is a stress test of vector allocation in many tasks.
