+
+cfg_if! {
+ if #[cfg(all(target_feature = "atomics", feature = "wasm-bindgen-threads"))] {
+ #[link(wasm_import_module = "__wbindgen_thread_xform__")]
+ extern {
+ fn __wbindgen_current_id() -> u32;
+ fn __wbindgen_tcb_get() -> u32;
+ fn __wbindgen_tcb_set(ptr: u32);
+ }
+ pub fn my_id() -> u32 {
+ unsafe { __wbindgen_current_id() }
+ }
+
+ // These are currently only ever used in `thread_local_atomics.rs`, if
+ // you'd like to use them be sure to update that and make sure everyone
+ // agrees what's what.
+ pub fn tcb_get() -> *mut u8 {
+ use mem;
+ assert_eq!(mem::size_of::<*mut u8>(), mem::size_of::<u32>());
+ unsafe { __wbindgen_tcb_get() as *mut u8 }
+ }
+
+ pub fn tcb_set(ptr: *mut u8) {
+ unsafe { __wbindgen_tcb_set(ptr as u32); }
+ }
+
+ // FIXME: still need something for hooking exiting a thread to free
+ // data...
+
+ } else if #[cfg(target_feature = "atomics")] {
+ pub fn my_id() -> u32 {
+ panic!("thread ids not implemented on wasm with atomics yet")
+ }
+
+ pub fn tcb_get() -> *mut u8 {
+ panic!("thread local data not implemented on wasm with atomics yet")
+ }
+
+ pub fn tcb_set(ptr: *mut u8) {
+ panic!("thread local data not implemented on wasm with atomics yet")
+ }
+ } else {
+ // stubbed out because no functions actually access these intrinsics
+ // unless atomics are enabled
+ }
+}