Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 28 insertions, 0 deletions

diff --git a/library/std/src/sys/windows/thread_local_dtor.rs b/library/std/src/sys/windows/thread_local_dtor.rs
new file mode 100644
index 000000000..25d1c6e8e
--- /dev/null
+++ b/library/std/src/sys/windows/thread_local_dtor.rs
@@ -0,0 +1,28 @@
+//! 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();
+
+pub unsafe fn register_dtor(t: *mut u8, dtor: unsafe extern "C" fn(*mut u8)) {
+    DESTRUCTORS.push((t, dtor));
+}
+
+/// 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();
+}