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// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use prelude::v1::*;
use alloc::boxed::FnBox;
use cmp;
use io;
use libc::{self, c_void, DWORD};
use mem;
use ptr;
use sys::c;
use sys::handle::Handle;
use sys_common::stack::RED_ZONE;
use sys_common::thread::*;
use time::Duration;
pub struct Thread {
handle: Handle
}
impl Thread {
pub unsafe fn new<'a>(stack: usize, p: Box<FnBox() + 'a>)
-> io::Result<Thread> {
let p = box p;
// FIXME On UNIX, we guard against stack sizes that are too small but
// that's because pthreads enforces that stacks are at least
// PTHREAD_STACK_MIN bytes big. Windows has no such lower limit, it's
// just that below a certain threshold you can't do anything useful.
// That threshold is application and architecture-specific, however.
// For now, the only requirement is that it's big enough to hold the
// red zone. Round up to the next 64 kB because that's what the NT
// kernel does, might as well make it explicit. With the current
// 20 kB red zone, that makes for a 64 kB minimum stack.
let stack_size = (cmp::max(stack, RED_ZONE) + 0xfffe) & (-0xfffe - 1);
let ret = c::CreateThread(ptr::null_mut(), stack_size as libc::size_t,
thread_start, &*p as *const _ as *mut _,
0, ptr::null_mut());
return if ret as usize == 0 {
Err(io::Error::last_os_error())
} else {
mem::forget(p); // ownership passed to CreateThread
Ok(Thread { handle: Handle::new(ret) })
};
#[no_stack_check]
extern "system" fn thread_start(main: *mut libc::c_void) -> DWORD {
unsafe { start_thread(main); }
0
}
}
pub fn set_name(_name: &str) {
// Windows threads are nameless
// The names in MSVC debugger are obtained using a "magic" exception,
// which requires a use of MS C++ extensions.
// See https://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
}
pub fn join(self) {
use libc::consts::os::extra::INFINITE;
unsafe { c::WaitForSingleObject(self.handle.raw(), INFINITE); }
}
pub fn yield_now() {
// This function will return 0 if there are no other threads to execute,
// but this also means that the yield was useless so this isn't really a
// case that needs to be worried about.
unsafe { c::SwitchToThread(); }
}
pub fn sleep(dur: Duration) {
unsafe {
c::Sleep(super::dur2timeout(dur))
}
}
}
pub mod guard {
use prelude::v1::*;
pub unsafe fn current() -> Option<usize> { None }
pub unsafe fn init() -> Option<usize> { None }
}
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