jemallocator/tests/background_thread_defaults.rs

//! Test background threads run-time default settings.
extern crate jemallocator;
extern crate libc;

use jemallocator::Jemalloc;

#[global_allocator]
static A: Jemalloc = Jemalloc;

// Returns true if background threads are enabled.
fn background_threads() -> bool {
    unsafe {
        let mut v: bool = false;
        jemallocator::mallctl_fetch(b"opt.background_thread\0", &mut v).unwrap();
        v
    }
}

#[test]
fn background_threads_runtime_defaults() {
    if !cfg!(feature = "background_threads_runtime_support") {
        // If the crate was compiled without background thread support,
        // then background threads are always disabled at run-time by default:
        assert_eq!(background_threads(), false);
        return;
    }

    if cfg!(feature = "background_threads") {
        // The crate was compiled with background-threads enabled by default:
        assert_eq!(background_threads(), true);
    } else {
        // The crate was compiled with background-threads disabled by default:
        assert_eq!(background_threads(), false);
    }
}