1 // Copyright 2017 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
14 use sys::{unsupported, Void};
17 pub struct Thread(Void);
19 pub const DEFAULT_MIN_STACK_SIZE: usize = 4096;
22 pub unsafe fn new<'a>(_stack: usize, _p: Box<dyn FnBox() + 'a>)
32 pub fn set_name(_name: &CStr) {
36 #[cfg(not(target_feature = "atomics"))]
37 pub fn sleep(_dur: Duration) {
38 panic!("can't sleep");
41 #[cfg(target_feature = "atomics")]
42 pub fn sleep(dur: Duration) {
43 use arch::wasm32::atomic;
46 // Use an atomic wait to block the current thread artificially with a
47 // timeout listed. Note that we should never be notified (return value
48 // of 0) or our comparison should never fail (return value of 1) so we
49 // should always only resume execution through a timeout (return value
51 let mut nanos = dur.as_nanos();
53 let amt = cmp::min(i64::max_value() as u128, nanos);
55 let val = unsafe { atomic::wait_i32(&mut x, 0, amt as i64) };
56 debug_assert_eq!(val, 2);
68 pub unsafe fn current() -> Option<Guard> { None }
69 pub unsafe fn init() -> Option<Guard> { None }
70 pub unsafe fn deinit() {}
74 if #[cfg(all(target_feature = "atomics", feature = "wasm-bindgen-threads"))] {
75 #[link(wasm_import_module = "__wbindgen_thread_xform__")]
77 fn __wbindgen_current_id() -> u32;
78 fn __wbindgen_tcb_get() -> u32;
79 fn __wbindgen_tcb_set(ptr: u32);
81 pub fn my_id() -> u32 {
82 unsafe { __wbindgen_current_id() }
85 // These are currently only ever used in `thread_local_atomics.rs`, if
86 // you'd like to use them be sure to update that and make sure everyone
87 // agrees what's what.
88 pub fn tcb_get() -> *mut u8 {
90 assert_eq!(mem::size_of::<*mut u8>(), mem::size_of::<u32>());
91 unsafe { __wbindgen_tcb_get() as *mut u8 }
94 pub fn tcb_set(ptr: *mut u8) {
95 unsafe { __wbindgen_tcb_set(ptr as u32); }
98 // FIXME: still need something for hooking exiting a thread to free
101 } else if #[cfg(target_feature = "atomics")] {
102 pub fn my_id() -> u32 {
103 panic!("thread ids not implemented on wasm with atomics yet")
106 pub fn tcb_get() -> *mut u8 {
107 panic!("thread local data not implemented on wasm with atomics yet")
110 pub fn tcb_set(ptr: *mut u8) {
111 panic!("thread local data not implemented on wasm with atomics yet")
114 // stubbed out because no functions actually access these intrinsics
115 // unless atomics are enabled