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//! Implements thread-local destructors that are not associated with any
//! particular data.
#![unstable(feature = "thread_local_internals", issue = "none")]
#![cfg(target_thread_local)]
// Using a per-thread list avoids the problems in synchronizing global state.
#[thread_local]
static mut DESTRUCTORS: Vec<(*mut u8, unsafe extern "C" fn(*mut u8))> = Vec::new();
// Ensure this can never be inlined because otherwise this may break in dylibs.
// See #44391.
#[inline(never)]
pub unsafe fn register_dtor(t: *mut u8, dtor: unsafe extern "C" fn(*mut u8)) {
DESTRUCTORS.push((t, dtor));
}
#[inline(never)] // See comment above
/// Runs destructors. This should not be called until thread exit.
pub unsafe fn run_keyless_dtors() {
// Drop all the destructors.
//
// Note: While this is potentially an infinite loop, it *should* be
// the case that this loop always terminates because we provide the
// guarantee that a TLS key cannot be set after it is flagged for
// destruction.
while let Some((ptr, dtor)) = DESTRUCTORS.pop() {
(dtor)(ptr);
}
// We're done so free the memory.
DESTRUCTORS = Vec::new();
}
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