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#![cfg(target_thread_local)]
#![unstable(feature = "thread_local_internals", issue = "none")]
// Simplify dtor registration by using a list of destructors.
use super::{abi, itron::task};
use crate::cell::{Cell, RefCell};
#[thread_local]
static REGISTERED: Cell<bool> = Cell::new(false);
#[thread_local]
static DTORS: RefCell<Vec<(*mut u8, unsafe extern "C" fn(*mut u8))>> = RefCell::new(Vec::new());
pub unsafe fn register_dtor(t: *mut u8, dtor: unsafe extern "C" fn(*mut u8)) {
if !REGISTERED.get() {
let tid = task::current_task_id_aborting();
// Register `tls_dtor` to make sure the TLS destructors are called
// for tasks created by other means than `std::thread`
unsafe { abi::SOLID_TLS_AddDestructor(tid as i32, tls_dtor) };
REGISTERED.set(true);
}
match DTORS.try_borrow_mut() {
Ok(mut dtors) => dtors.push((t, dtor)),
Err(_) => rtabort!("global allocator may not use TLS"),
}
}
pub unsafe fn run_dtors() {
let mut list = DTORS.take();
while !list.is_empty() {
for (ptr, dtor) in list {
unsafe { dtor(ptr) };
}
list = DTORS.take();
}
}
unsafe extern "C" fn tls_dtor(_unused: *mut u8) {
unsafe { run_dtors() };
}
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