1 // Copyright 2014 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.
18 use sys::handle::Handle;
19 use sys_common::thread::*;
24 pub const DEFAULT_MIN_STACK_SIZE: usize = 2 * 1024 * 1024;
31 pub unsafe fn new<'a>(stack: usize, p: Box<dyn FnBox() + 'a>)
32 -> io::Result<Thread> {
35 // FIXME On UNIX, we guard against stack sizes that are too small but
36 // that's because pthreads enforces that stacks are at least
37 // PTHREAD_STACK_MIN bytes big. Windows has no such lower limit, it's
38 // just that below a certain threshold you can't do anything useful.
39 // That threshold is application and architecture-specific, however.
40 // Round up to the next 64 kB because that's what the NT kernel does,
41 // might as well make it explicit.
42 let stack_size = (stack + 0xfffe) & (!0xfffe);
43 let ret = c::CreateThread(ptr::null_mut(), stack_size,
44 thread_start, &*p as *const _ as *mut _,
45 c::STACK_SIZE_PARAM_IS_A_RESERVATION,
48 return if ret as usize == 0 {
49 Err(io::Error::last_os_error())
51 mem::forget(p); // ownership passed to CreateThread
52 Ok(Thread { handle: Handle::new(ret) })
55 extern "system" fn thread_start(main: *mut c_void) -> c::DWORD {
56 unsafe { start_thread(main as *mut u8); }
61 pub fn set_name(name: &CStr) {
62 if let Ok(utf8) = name.to_str() {
63 if let Ok(utf16) = to_u16s(utf8) {
64 unsafe { c::SetThreadDescription(c::GetCurrentThread(), utf16.as_ptr()); };
70 let rc = unsafe { c::WaitForSingleObject(self.handle.raw(), c::INFINITE) };
71 if rc == c::WAIT_FAILED {
72 panic!("failed to join on thread: {}",
73 io::Error::last_os_error());
78 // This function will return 0 if there are no other threads to execute,
79 // but this also means that the yield was useless so this isn't really a
80 // case that needs to be worried about.
81 unsafe { c::SwitchToThread(); }
84 pub fn sleep(dur: Duration) {
86 c::Sleep(super::dur2timeout(dur))
90 pub fn handle(&self) -> &Handle { &self.handle }
92 pub fn into_handle(self) -> Handle { self.handle }
95 #[cfg_attr(test, allow(dead_code))]
98 pub unsafe fn current() -> Option<Guard> { None }
99 pub unsafe fn init() -> Option<Guard> { None }
100 pub unsafe fn deinit() {}