Deprecate CallbackGuard

src/main_context.rs

@@ -13,7 +13,7 @@ use MainContext;
 use Source;
 use SourceId;
 
-use source::{CallbackGuard, Priority};
+use source::Priority;
 
 impl MainContext {
     pub fn prepare(&self) -> (bool, i32) {
@@ -49,15 +49,13 @@ impl MainContext {
 
 #[cfg_attr(feature = "cargo-clippy", allow(transmute_ptr_to_ref))]
 unsafe extern "C" fn trampoline<F: FnOnce() + Send + 'static>(func: gpointer) -> gboolean {
-    let _guard = CallbackGuard::new();
     let func: &mut Option<Box<F>> = transmute(func);
     let func = func.take().expect("MainContext::invoke() closure called multiple times");
     func();
     glib_ffi::G_SOURCE_REMOVE
 }
 
 unsafe extern "C" fn destroy_closure<F: FnOnce() + Send + 'static>(ptr: gpointer) {
-    let _guard = CallbackGuard::new();
     Box::<Option<Box<F>>>::from_raw(ptr as *mut _);
 }
 

src/signal.rs

@@ -9,7 +9,6 @@ use libc::{c_void, c_uint, c_ulong};
 use gobject_ffi::{self, GCallback};
 use ffi::{gboolean, GQuark};
 use object::{IsA, Object};
-use source::CallbackGuard;
 use translate::{from_glib, FromGlib, ToGlib, ToGlibPtr};
 
 /// The id of a signal that is returned by `connect`.
@@ -89,7 +88,6 @@ pub fn signal_stop_emission_by_name<T: IsA<Object>>(instance: &T, signal_name: &
 }
 
 unsafe extern "C" fn destroy_closure(ptr: *mut c_void, _: *mut gobject_ffi::GClosure) {
-    let _guard = CallbackGuard::new();
     // destroy
     Box::<Box<Fn()>>::from_raw(ptr as *mut _);
 }

src/source.rs

@@ -54,20 +54,24 @@ impl ToGlib for Continue {
 
 /// Unwinding propagation guard. Aborts the process if destroyed while
 /// panicking.
+#[deprecated(note="Rustc has this functionality built-in since 1.24.0")]
 pub struct CallbackGuard(());
 
+#[allow(deprecated)]
 impl CallbackGuard {
     pub fn new() -> CallbackGuard {
         CallbackGuard(())
     }
 }
 
+#[allow(deprecated)]
 impl Default for CallbackGuard {
     fn default() -> Self {
         Self::new()
     }
 }
 
+#[allow(deprecated)]
 impl Drop for CallbackGuard {
     fn drop(&mut self) {
         use std::io::stderr;
@@ -82,13 +86,11 @@ impl Drop for CallbackGuard {
 
 #[cfg_attr(feature = "cargo-clippy", allow(transmute_ptr_to_ref))]
 unsafe extern "C" fn trampoline(func: gpointer) -> gboolean {
-    let _guard = CallbackGuard::new();
     let func: &RefCell<Box<FnMut() -> Continue + 'static>> = transmute(func);
     (&mut *func.borrow_mut())().to_glib()
 }
 
 unsafe extern "C" fn destroy_closure(ptr: gpointer) {
-    let _guard = CallbackGuard::new();
     Box::<RefCell<Box<FnMut() -> Continue + 'static>>>::from_raw(ptr as *mut _);
 }
 
@@ -100,13 +102,11 @@ fn into_raw<F: FnMut() -> Continue + Send + 'static>(func: F) -> gpointer {
 
 #[cfg_attr(feature = "cargo-clippy", allow(transmute_ptr_to_ref))]
 unsafe extern "C" fn trampoline_child_watch(pid: u32, status: i32, func: gpointer) {
-    let _guard = CallbackGuard::new();
     let func: &RefCell<Box<FnMut(u32, i32) + 'static>> = transmute(func);
     (&mut *func.borrow_mut())(pid, status)
 }
 
 unsafe extern "C" fn destroy_closure_child_watch(ptr: gpointer) {
-    let _guard = CallbackGuard::new();
     Box::<RefCell<Box<FnMut(u32, i32) + 'static>>>::from_raw(ptr as *mut _);
 }
 

src/value.rs

@@ -944,13 +944,11 @@ impl AnyValue {
     }
 
     unsafe extern "C" fn copy(v: *mut c_void) -> *mut c_void {
-        let _guard = ::source::CallbackGuard::new();
         let v = &*(v as *mut AnyValue);
         Box::into_raw(Box::new(v.clone())) as *mut c_void
     }
 
     unsafe extern "C" fn free(v: *mut c_void) {
-        let _guard = ::source::CallbackGuard::new();
         let _ = Box::from_raw(v as *mut AnyValue);
     }
 }
@@ -1021,13 +1019,11 @@ impl AnySendValue {
     }
 
     unsafe extern "C" fn copy(v: *mut c_void) -> *mut c_void {
-        let _guard = ::source::CallbackGuard::new();
         let v = &*(v as *mut AnySendValue);
         Box::into_raw(Box::new(v.clone())) as *mut c_void
     }
 
     unsafe extern "C" fn free(v: *mut c_void) {
-        let _guard = ::source::CallbackGuard::new();
         let _ = Box::from_raw(v as *mut AnySendValue);
     }
 }