src/librustc_middle/ty/query/job.rs

   1 use crate::ty::tls;
   2
   3 use rustc_query_system::query::deadlock;
   4 use rustc_rayon_core as rayon_core;
   5 use std::thread;
   6
   7 /// Creates a new thread and forwards information in thread locals to it.
   8 /// The new thread runs the deadlock handler.
   9 /// Must only be called when a deadlock is about to happen.
  10 pub unsafe fn handle_deadlock() {
  11     let registry = rayon_core::Registry::current();
  12
  13     let context = tls::get_tlv();
  14     assert!(context != 0);
  15     rustc_data_structures::sync::assert_sync::<tls::ImplicitCtxt<'_, '_>>();
  16     let icx: &tls::ImplicitCtxt<'_, '_> = &*(context as *const tls::ImplicitCtxt<'_, '_>);
  17
  18     let session_globals = rustc_span::SESSION_GLOBALS.with(|sg| sg as *const _);
  19     let session_globals = &*session_globals;
  20     thread::spawn(move || {
  21         tls::enter_context(icx, |_| {
  22             rustc_span::SESSION_GLOBALS
  23                 .set(session_globals, || tls::with(|tcx| deadlock(tcx, &registry)))
  24         })
  25     });
  26 }