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 // unsafe: see thread::Builder::spawn_unchecked for safety requirements
23 pub unsafe fn new(_stack: usize, _p: Box<dyn FnBox()>)
33 pub fn set_name(_name: &CStr) {
37 #[cfg(not(target_feature = "atomics"))]
38 pub fn sleep(_dur: Duration) {
39 panic!("can't sleep");
42 #[cfg(target_feature = "atomics")]
43 pub fn sleep(dur: Duration) {
44 use arch::wasm32::atomic;
47 // Use an atomic wait to block the current thread artificially with a
48 // timeout listed. Note that we should never be notified (return value
49 // of 0) or our comparison should never fail (return value of 1) so we
50 // should always only resume execution through a timeout (return value
52 let mut nanos = dur.as_nanos();
54 let amt = cmp::min(i64::max_value() as u128, nanos);
56 let val = unsafe { atomic::wait_i32(&mut x, 0, amt as i64) };
57 debug_assert_eq!(val, 2);
69 pub unsafe fn current() -> Option<Guard> { None }
70 pub unsafe fn init() -> Option<Guard> { None }
71 pub unsafe fn deinit() {}
75 if #[cfg(all(target_feature = "atomics", feature = "wasm-bindgen-threads"))] {
76 #[link(wasm_import_module = "__wbindgen_thread_xform__")]
78 fn __wbindgen_current_id() -> u32;
79 fn __wbindgen_tcb_get() -> u32;
80 fn __wbindgen_tcb_set(ptr: u32);
82 pub fn my_id() -> u32 {
83 unsafe { __wbindgen_current_id() }
86 // These are currently only ever used in `thread_local_atomics.rs`, if
87 // you'd like to use them be sure to update that and make sure everyone
88 // agrees what's what.
89 pub fn tcb_get() -> *mut u8 {
91 assert_eq!(mem::size_of::<*mut u8>(), mem::size_of::<u32>());
92 unsafe { __wbindgen_tcb_get() as *mut u8 }
95 pub fn tcb_set(ptr: *mut u8) {
96 unsafe { __wbindgen_tcb_set(ptr as u32); }
99 // FIXME: still need something for hooking exiting a thread to free
102 } else if #[cfg(target_feature = "atomics")] {
103 pub fn my_id() -> u32 {
104 panic!("thread ids not implemented on wasm with atomics yet")
107 pub fn tcb_get() -> *mut u8 {
108 panic!("thread local data not implemented on wasm with atomics yet")
111 pub fn tcb_set(ptr: *mut u8) {
112 panic!("thread local data not implemented on wasm with atomics yet")
115 // stubbed out because no functions actually access these intrinsics
116 // unless atomics are enabled