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 gcx_ptr = tls::GCX_PTR.with(|gcx_ptr| gcx_ptr as *const _);
  14     let gcx_ptr = &*gcx_ptr;
  15
  16     let rustc_span_globals =
  17         rustc_span::GLOBALS.with(|rustc_span_globals| rustc_span_globals as *const _);
  18     let rustc_span_globals = &*rustc_span_globals;
  19     let syntax_globals = rustc_ast::attr::GLOBALS.with(|syntax_globals| syntax_globals as *const _);
  20     let syntax_globals = &*syntax_globals;
  21     thread::spawn(move || {
  22         tls::GCX_PTR.set(gcx_ptr, || {
  23             rustc_ast::attr::GLOBALS.set(syntax_globals, || {
  24                 rustc_span::GLOBALS
  25                     .set(rustc_span_globals, || tls::with_global(|tcx| deadlock(tcx, &registry)))
  26             });
  27         })
  28     });
  29 }