126 lines
3.7 KiB
Rust
126 lines
3.7 KiB
Rust
// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use alloc::boxed::FnBox;
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use cmp;
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use ffi::CStr;
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use io;
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use libc;
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use mem;
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use ptr;
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use sys::cloudabi::abi;
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use sys::time::dur2intervals;
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use sys_common::thread::*;
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use time::Duration;
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pub const DEFAULT_MIN_STACK_SIZE: usize = 2 * 1024 * 1024;
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pub struct Thread {
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id: libc::pthread_t,
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}
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// CloudABI has pthread_t as a pointer in which case we still want
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// a thread to be Send/Sync
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unsafe impl Send for Thread {}
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unsafe impl Sync for Thread {}
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impl Thread {
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pub unsafe fn new<'a>(stack: usize, p: Box<FnBox() + 'a>) -> io::Result<Thread> {
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let p = box p;
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let mut native: libc::pthread_t = mem::zeroed();
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let mut attr: libc::pthread_attr_t = mem::zeroed();
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assert_eq!(libc::pthread_attr_init(&mut attr), 0);
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let stack_size = cmp::max(stack, min_stack_size(&attr));
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assert_eq!(libc::pthread_attr_setstacksize(&mut attr, stack_size), 0);
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let ret = libc::pthread_create(&mut native, &attr, thread_start, &*p as *const _ as *mut _);
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assert_eq!(libc::pthread_attr_destroy(&mut attr), 0);
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return if ret != 0 {
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Err(io::Error::from_raw_os_error(ret))
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} else {
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mem::forget(p); // ownership passed to pthread_create
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Ok(Thread { id: native })
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};
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extern "C" fn thread_start(main: *mut libc::c_void) -> *mut libc::c_void {
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unsafe {
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start_thread(main as *mut u8);
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}
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ptr::null_mut()
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}
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}
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pub fn yield_now() {
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let ret = unsafe { abi::thread_yield() };
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debug_assert_eq!(ret, abi::errno::SUCCESS);
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}
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pub fn set_name(_name: &CStr) {
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// CloudABI has no way to set a thread name.
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}
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pub fn sleep(dur: Duration) {
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unsafe {
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let subscription = abi::subscription {
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type_: abi::eventtype::CLOCK,
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union: abi::subscription_union {
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clock: abi::subscription_clock {
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clock_id: abi::clockid::MONOTONIC,
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timeout: dur2intervals(&dur),
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..mem::zeroed()
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},
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},
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..mem::zeroed()
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};
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let mut event: abi::event = mem::uninitialized();
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let mut nevents: usize = mem::uninitialized();
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let ret = abi::poll(&subscription, &mut event, 1, &mut nevents);
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assert_eq!(ret, abi::errno::SUCCESS);
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assert_eq!(event.error, abi::errno::SUCCESS);
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}
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}
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pub fn join(self) {
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unsafe {
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let ret = libc::pthread_join(self.id, ptr::null_mut());
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mem::forget(self);
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assert!(
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ret == 0,
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"failed to join thread: {}",
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io::Error::from_raw_os_error(ret)
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);
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}
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}
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}
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impl Drop for Thread {
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fn drop(&mut self) {
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let ret = unsafe { libc::pthread_detach(self.id) };
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debug_assert_eq!(ret, 0);
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}
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}
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#[cfg_attr(test, allow(dead_code))]
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pub mod guard {
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pub type Guard = !;
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pub unsafe fn current() -> Option<Guard> {
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None
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}
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pub unsafe fn init() -> Option<Guard> {
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None
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}
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pub unsafe fn deinit() {}
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}
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fn min_stack_size(_: *const libc::pthread_attr_t) -> usize {
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libc::PTHREAD_STACK_MIN
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}
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