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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 core::prelude::*;
use boxed::Box;
use cmp;
use mem;
use ptr;
use libc;
use libc::types::os::arch::extra::{LPSECURITY_ATTRIBUTES, SIZE_T, BOOL,
LPVOID, DWORD, LPDWORD, HANDLE};
use thunk::Thunk;
use sys_common::stack::RED_ZONE;
use sys_common::thread::*;
pub type rust_thread = HANDLE;
pub type rust_thread_return = DWORD;
pub type StartFn = extern "system" fn(*mut libc::c_void) -> rust_thread_return;
#[no_stack_check]
pub extern "system" fn thread_start(main: *mut libc::c_void) -> rust_thread_return {
return start_thread(main);
}
pub mod guard {
pub unsafe fn main() -> uint {
0
}
pub unsafe fn current() -> uint {
0
}
pub unsafe fn init() {
}
}
pub unsafe fn create(stack: uint, p: Thunk) -> rust_thread {
let arg: *mut libc::c_void = mem::transmute(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 = CreateThread(ptr::null_mut(), stack_size as libc::size_t,
thread_start, arg, 0, ptr::null_mut());
if ret as uint == 0 {
// be sure to not leak the closure
let _p: Box<Thunk> = mem::transmute(arg);
panic!("failed to spawn native thread: {:?}", ret);
}
return ret;
}
pub unsafe fn join(native: rust_thread) {
use libc::consts::os::extra::INFINITE;
WaitForSingleObject(native, INFINITE);
}
pub unsafe fn detach(native: rust_thread) {
assert!(libc::CloseHandle(native) != 0);
}
pub unsafe 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.
SwitchToThread();
}
#[allow(non_snake_case)]
extern "system" {
fn CreateThread(lpThreadAttributes: LPSECURITY_ATTRIBUTES,
dwStackSize: SIZE_T,
lpStartAddress: StartFn,
lpParameter: LPVOID,
dwCreationFlags: DWORD,
lpThreadId: LPDWORD) -> HANDLE;
fn WaitForSingleObject(hHandle: HANDLE, dwMilliseconds: DWORD) -> DWORD;
fn SwitchToThread() -> BOOL;
}
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