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use lazy_static

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Folkert 2022-03-12 00:18:06 +01:00
parent e1d5b748b1
commit 28ce49c273
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4 changed files with 7 additions and 37 deletions
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40
compiler/builtins/src/std.rs
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@ -13,45 +13,13 @@ use roc_types::subs::VarId;
use roc_types::types::RecordField;
use std::collections::HashMap;
use std::sync::atomic::{AtomicU8, Ordering};
lazy_static::lazy_static! {
static ref STDLIB: StdLib = standard_stdlib();
}
/// A global static that stores our initialized standard library definitions
static mut STDLIB: Option<StdLib> = None;
static mut STDLIB_STATE: AtomicU8 = AtomicU8::new(STDLIB_STATE_EMPTY);
const STDLIB_STATE_EMPTY: u8 = 0;
const STDLIB_STATE_LOCKED: u8 = 1;
const STDLIB_STATE_READY: u8 = 2;
pub fn borrow_stdlib() -> &'static StdLib {
let state = unsafe { &STDLIB_STATE };
let ce = state.compare_exchange(
STDLIB_STATE_EMPTY,
STDLIB_STATE_LOCKED,
Ordering::Acquire,
Ordering::Relaxed,
);
match ce {
Ok(_) => {
// the STDLIB static is empty, and we have the write lock
let stdlib = unsafe { &mut STDLIB };
*stdlib = Some(standard_stdlib());
state.store(STDLIB_STATE_READY, Ordering::SeqCst);
stdlib.as_ref().unwrap()
}
Err(_) => {
// someone else has the write lock. They will soon move into the ready state
while state.load(Ordering::SeqCst) != STDLIB_STATE_READY {
// do nothng
}
unsafe { &STDLIB }.as_ref().unwrap()
}
}
&STDLIB
}
/// Example: