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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. | |
4 | // | |
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. | |
10 | ||
85aaf69f | 11 | use prelude::v1::*; |
1a4d82fc | 12 | |
d9579d0f | 13 | use alloc::boxed::FnBox; |
85aaf69f | 14 | use io; |
54a0048b | 15 | use ffi::CStr; |
c34b1796 | 16 | use mem; |
92a42be0 | 17 | use libc::c_void; |
c34b1796 | 18 | use ptr; |
d9579d0f AL |
19 | use sys::c; |
20 | use sys::handle::Handle; | |
1a4d82fc | 21 | use sys_common::thread::*; |
c34b1796 | 22 | use time::Duration; |
1a4d82fc | 23 | |
d9579d0f AL |
24 | pub struct Thread { |
25 | handle: Handle | |
1a4d82fc JJ |
26 | } |
27 | ||
d9579d0f AL |
28 | impl Thread { |
29 | pub unsafe fn new<'a>(stack: usize, p: Box<FnBox() + 'a>) | |
30 | -> io::Result<Thread> { | |
31 | let p = box p; | |
1a4d82fc | 32 | |
d9579d0f AL |
33 | // FIXME On UNIX, we guard against stack sizes that are too small but |
34 | // that's because pthreads enforces that stacks are at least | |
35 | // PTHREAD_STACK_MIN bytes big. Windows has no such lower limit, it's | |
36 | // just that below a certain threshold you can't do anything useful. | |
37 | // That threshold is application and architecture-specific, however. | |
e9174d1e SL |
38 | // Round up to the next 64 kB because that's what the NT kernel does, |
39 | // might as well make it explicit. | |
40 | let stack_size = (stack + 0xfffe) & (!0xfffe); | |
92a42be0 | 41 | let ret = c::CreateThread(ptr::null_mut(), stack_size, |
d9579d0f AL |
42 | thread_start, &*p as *const _ as *mut _, |
43 | 0, ptr::null_mut()); | |
c34b1796 | 44 | |
d9579d0f AL |
45 | return if ret as usize == 0 { |
46 | Err(io::Error::last_os_error()) | |
47 | } else { | |
48 | mem::forget(p); // ownership passed to CreateThread | |
49 | Ok(Thread { handle: Handle::new(ret) }) | |
50 | }; | |
85aaf69f | 51 | |
92a42be0 | 52 | extern "system" fn thread_start(main: *mut c_void) -> c::DWORD { |
d9579d0f AL |
53 | unsafe { start_thread(main); } |
54 | 0 | |
55 | } | |
56 | } | |
1a4d82fc | 57 | |
54a0048b | 58 | pub fn set_name(_name: &CStr) { |
d9579d0f AL |
59 | // Windows threads are nameless |
60 | // The names in MSVC debugger are obtained using a "magic" exception, | |
61 | // which requires a use of MS C++ extensions. | |
62 | // See https://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx | |
63 | } | |
1a4d82fc | 64 | |
d9579d0f | 65 | pub fn join(self) { |
92a42be0 | 66 | unsafe { c::WaitForSingleObject(self.handle.raw(), c::INFINITE); } |
d9579d0f | 67 | } |
1a4d82fc | 68 | |
d9579d0f AL |
69 | pub fn yield_now() { |
70 | // This function will return 0 if there are no other threads to execute, | |
71 | // but this also means that the yield was useless so this isn't really a | |
72 | // case that needs to be worried about. | |
73 | unsafe { c::SwitchToThread(); } | |
74 | } | |
1a4d82fc | 75 | |
d9579d0f AL |
76 | pub fn sleep(dur: Duration) { |
77 | unsafe { | |
78 | c::Sleep(super::dur2timeout(dur)) | |
c34b1796 | 79 | } |
c34b1796 | 80 | } |
92a42be0 SL |
81 | |
82 | pub fn handle(&self) -> &Handle { &self.handle } | |
83 | ||
84 | pub fn into_handle(self) -> Handle { self.handle } | |
c34b1796 AL |
85 | } |
86 | ||
7453a54e | 87 | #[cfg_attr(test, allow(dead_code))] |
d9579d0f | 88 | pub mod guard { |
c1a9b12d SL |
89 | pub unsafe fn current() -> Option<usize> { None } |
90 | pub unsafe fn init() -> Option<usize> { None } | |
1a4d82fc | 91 | } |