std: Re-enable at_exit()

The new semantics of this function are that the callbacks are run when the *main
thread* exits, not when all threads have exited. This implies that other threads
may still be running when the `at_exit` callbacks are invoked and users need to
be prepared for this situation.

Users in the standard library have been audited in accordance to these new rules
as well.

Closes #20012

1 files changed, 1 insertions, 9 deletions

diff --git a/src/libstd/sys/windows/stack_overflow.rs b/src/libstd/sys/windows/stack_overflow.rs
index bdf2e0bccb1..ab092f5a243 100644
--- a/src/libstd/sys/windows/stack_overflow.rs
+++ b/src/libstd/sys/windows/stack_overflow.rs
@@ -14,7 +14,7 @@ use ptr;
 use mem;
 use libc;
 use libc::types::os::arch::extra::{LPVOID, DWORD, LONG, BOOL};
-use sys_common::{stack, thread_info};
+use sys_common::stack;
 
 pub struct Handler {
     _data: *mut libc::c_void
@@ -30,14 +30,6 @@ impl Drop for Handler {
     fn drop(&mut self) {}
 }
 
-// get_task_info is called from an exception / signal handler.
-// It returns the guard page of the current task or 0 if that
-// guard page doesn't exist. None is returned if there's currently
-// no local task.
-unsafe fn get_task_guard_page() -> uint {
-    thread_info::stack_guard()
-}
-
 // This is initialized in init() and only read from after
 static mut PAGE_SIZE: uint = 0;